Dual-chamber fracturing device

Abstract

The present invention relates to the field of fracturing technology, and is a dual-chamber fracturing device, comprising a liquid storage cylinder, a switching switch, a linkage assembly, and an outer cylinder with a closed inner cavity, wherein the upper end of the outer cylinder is provided with a liquid inlet hole communicating with the inside and outside, the inner side of the lower portion of the outer cylinder is provided with a liquid storage cylinder, and a partition plate is fixedly installed in the center of the liquid storage cylinder. The present invention has a reasonable and compact structure, wherein the first lower piston and the second lower piston are provided, and the first lower piston can be moved upward by injecting a fracturing medium into the first liquid storage chamber below the first lower piston. After the first lower piston moves up and down, the switching switch can be actuated by the linkage assembly, thereby realizing the switching of the injection direction of the fracturing medium from the first liquid storage chamber to the second liquid storage chamber. By providing the first connecting hole, the liquid storage volume can be increased, so that the dual-chamber fracturing device is lowered into the target fracturing position, and the fracturing position can be fracturing after continuously injecting fracturing fluid into the liquid inlet hole. The operation difficulty is low, and the operation efficiency can be greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of fracturing and relates to a dual-chamber fracturing device. Background Art

[0002] Traditionally, unconventional oil and gas development typically relies on hydraulic fracturing. This involves artificially injecting a water-based fracturing fluid containing proppants to induce, propagate, and propel fractures, maintaining highly conductive pathways. This allows oil and gas to flow smoothly through the fractures into the well, thereby increasing production and efficiency. However, this method is limited in its ability to create complex fractures in formations, and the resulting fractures are often single, principal fractures perpendicular to the direction of minimum horizontal principal stress.

[0003] Currently, conventional hydraulic fracturing is widely used to develop unconventional energy sources such as shale gas, tight gas, and coalbed methane, and has achieved some success. However, this method presents challenges such as difficulty in fracturing fluid flowback, high water consumption, and severe reservoir contamination. To address this, research has recently begun on novel waterless fracturing methods, aiming to reduce water usage while preventing damage to reservoirs and the natural environment caused by fracturing fluid additives, ultimately achieving efficient and environmentally friendly fracturing results.

[0004] In recent years, the rapid development of waterless fracturing technology is expected to promote the efficient development of unconventional oil and gas. Among them, carbon dioxide fracturing has many advantages, including low fracturing pressure, easy formation of complex fractures, no reservoir damage, and the realization of geological storage of carbon dioxide. However, it also has problems such as poor sand-carrying capacity and narrow fracture width. In addition, the bedrock of unconventional oil and gas reservoirs is very dense, mainly composed of micro- and nano-pores. For some of the well-developed micron- to millimeter-scale natural fractures, commonly used large-scale fracturing proppants such as 20 / 40 and 40 / 70 mesh natural quartz sand, artificial ceramsite, and resin-coated sand have difficulty entering the micro-fractures in deep formations. As a result, the proppant transportation distance is far less than the response distance of the fracturing fluid, affecting the fracturing effect.

[0005] During CO2 shock fracturing, CO2 fracturing fluid is injected into the fracturing string to physically increase the pressure within the downhole energy-gathering tool. When the pressure within the fracturing string exceeds the design pressure, the discharge channel of the energy-gathering tool automatically opens, generating a high-pressure, controllable CO2 shock wave, effectively fracturing the target reservoir and achieving greater production increases than conventional fracturing methods. Currently, CO2 shock fracturing typically involves dropping a ball into the pressure string to create a seal, then pumping in the CO2 fracturing fluid to initiate the fracturing operation.

[0006] Chinese patent document with publication number CN111911125A discloses a concentrated energy fracturing tool, which includes: a shell with a cavity, the shell having an inlet end and an outlet end, and a groove is provided on the inner wall of the shell; a sealing member arranged near the inlet end and a first elastic member arranged near the outlet end; the sealing member is provided with a pin that cooperates with the groove and a second elastic member that provides thrust for the pin; the pressure of the fracturing medium causes the pin to be sheared, and when the sealing member moves relative to the shell and compresses the first elastic member, the cavity is in a through state, and the fracturing medium flows out from the outlet end; when the first elastic member and the second elastic member cooperate to push the pin into the groove, the cavity is in a blocked state.

[0007] Existing supercritical carbon dioxide concentrated energy fracturing tools have a small fluid storage volume. When draining fluid and fracturing, they can only rely on the deformation reset of the compression spring inside the tool. The fracturing energy is low and the fracturing effect is poor, resulting in low operating efficiency, complex operation, and prone to failure defects of the concentrated energy fracturing device. Summary of the Invention

[0008] The present invention provides a dual-chamber fracturing device, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of low operating efficiency and complex operation of the existing dual-chamber fracturing device.

[0009] The cam is secured to the bottom of the second liquid storage chamber and is adapted to engage the pump with a second piston which is secured to the bottom of the second liquid storage chamber and is adapted to engage the pump with a second piston receptacle which is further adapted to engage the pump with a second piston receptacle.

[0010] A switching switch is provided on the upper part of the liquid inlet column. When the switching switch is actuated, the liquid inlet hole can be connected to the first liquid pipe or the second liquid pipe. A first inner liquid outlet hole is provided on the outer side of the left part of the liquid storage cylinder, which is connected to the inside and outside. A first outer liquid outlet hole is provided on the outer side of the left part of the outer cylinder, which corresponds to the first inner liquid outlet hole. A second inner liquid outlet hole is provided on the outer side of the right part of the liquid storage cylinder, which corresponds to the second inner liquid outlet hole.

[0011] A linkage component is provided in the liquid storage cylinder, and when the volume of the medium flowing into the first liquid tube reaches a first set value, the linkage component can cause the switching switch to operate so that the liquid inlet is connected to the second liquid tube, the first inner liquid outlet is not connected to the first outer liquid outlet, and the second inner liquid outlet is connected to the second outer liquid outlet; when the volume of the medium flowing into the second liquid tube reaches a second set value, the linkage component can cause the switching switch to operate again so that the liquid inlet is connected to the first liquid tube, the first inner liquid outlet is connected to the first outer liquid outlet, and the second inner liquid outlet is not connected to the second outer liquid outlet.

[0012] The following are further optimizations and / or improvements to the above technical solutions:

[0013] The upper end of the above-mentioned outer cylinder can be fixedly installed with a liquid inlet pipe whose lower end is respectively connected to the upper end of the first liquid inlet channel and the upper end of the second liquid inlet channel. The upper end of the liquid inlet pipe is sealed and passed through the liquid inlet hole and is located above the outer cylinder. A second communicating hole is provided in the partition plate. The lower end of the second communicating hole is connected to the second liquid storage chamber below the second lower piston, and the upper end of the second communicating hole is connected to the upper part of the first liquid storage chamber.

[0014] The above-mentioned switching switch may include an upper switch plate and a lower switch plate, and the upper mounting holes and lower mounting holes are distributed at intervals above and below the liquid inlet column corresponding to the position between the liquid inlet pipe and the first liquid passage, and the middle of the upper mounting hole and the middle of the lower mounting hole are respectively connected to the first liquid inlet channel and the second liquid inlet channel, the upper switch plate is slidably mounted in the upper mounting hole, the first upper switch hole corresponding to the first liquid inlet channel is provided on the upper left side of the upper switch plate, and the second upper switch hole is provided on the right side of the upper switch plate corresponding to the right position of the second liquid inlet channel, the lower switch plate is slidably mounted in the lower mounting hole, the first lower switch hole corresponding to the first liquid inlet channel is provided on the upper left side of the lower switch plate, and the second lower switch hole is provided on the right side of the lower switch plate corresponding to the right position of the second liquid inlet channel, a sliding groove is provided on the lower right side of the upper switch plate, and a connecting rod with an upper end slidably mounted in the sliding groove is fixedly mounted on the upper side of the lower switch plate;

[0015] When the volume of the medium flowing into the first liquid pipe reaches a first set value, the linkage assembly can cause the upper switch plate and the lower switch plate to move to the left so that the liquid inlet is connected to the second liquid pipe, and the first inner liquid outlet is disconnected from the first outer liquid outlet; when the volume of the medium flowing into the second liquid pipe reaches a second set value, the linkage assembly can cause the upper switch plate and the lower switch plate to move to the right so that the liquid inlet is connected to the first liquid pipe, the first inner liquid outlet is connected to the first outer liquid outlet, and the second inner liquid outlet is disconnected from the second outer liquid outlet.

[0016] The above-mentioned switching structure may further include an upper positioning mechanism and a lower positioning mechanism, the upper positioning mechanism includes an upper hook and an upper elastic reset member, an upper slot is provided on the upper left side of the upper switch plate corresponding to the left position of the liquid inlet column, an upper hook is hingedly installed on the left side of the upper part of the liquid inlet column, the lower part of the upper hook is clamped in the upper slot, and an upper elastic reset member is provided between the right side of the upper switch plate and the inner side of the right part of the outer cylinder;

[0017] The lower positioning mechanism includes a lower hook and a lower elastic reset member. A lower slot is provided on the upper right side of the lower switch plate corresponding to the right position of the liquid inlet column. A lower hook is hingedly installed on the right side of the upper part of the liquid inlet column. The lower part of the lower hook can be clamped into the lower slot after the lower switch plate moves to the left. A lower elastic reset member is provided between the left side of the lower switch plate and the inner side of the left part of the outer cylinder.

[0018] When the volume of the medium flowing into the first liquid pipe reaches a first set value, the linkage assembly: the upper hook and the upper slot are separated from each other, the upper elastic reset member is reset, the upper switch plate and the lower switch plate move to the left to connect the liquid inlet with the second liquid pipe, the lower hook is locked in the lower slot, the first inner liquid outlet is disconnected from the first outer liquid outlet, and the second inner liquid outlet is connected to the second outer liquid outlet;

[0019] When the volume of the medium flowing into the second liquid pipe reaches the second set value, the linkage assembly: the lower hook and the lower slot are separated from each other, the lower elastic reset member is reset, the upper switch plate and the lower switch plate move to the right to connect the liquid inlet hole with the first liquid pipe, the upper hook is installed in the upper slot, the first inner liquid outlet hole is connected to the first outer liquid hole, and the second inner liquid outlet hole is disconnected from the second outer liquid hole.

[0020] The above-mentioned linkage assembly may include a switch opening and closing mechanism and a liquid outlet opening and closing mechanism, the switch opening and closing mechanism includes a first upper piston, a first switch rod, a second upper piston and a second switch rod, the first upper piston is slidably installed in the first liquid storage chamber corresponding to the position above the first lower piston, the first upper piston is sleeved on the outside of the first liquid tube, the upper end of the first upper piston is fixedly installed with the first switch rod corresponding to the upper end of the upper hook, the upper end of the first switch rod is sealed through the upper end of the left part of the liquid storage cylinder, the lower left side of the lower switch plate corresponding to the position of the first switch rod is provided with a left lower through hole that passes through from top to bottom, the lower left side of the upper switch plate corresponding to the position of the lower through hole is provided with a left upper through hole that passes through from top to bottom, and a left elastic reset member is provided between the upper end of the first upper piston and the upper inner side of the first liquid storage chamber;

[0021] A second upper piston is slidably mounted in the second liquid storage chamber corresponding to the position above the second lower piston. The second upper piston is sleeved on the outside of the second liquid passage tube. A second switch rod corresponding to the lower hook is fixedly mounted on the upper end of the second upper piston. The upper end of the second switch rod seals and passes through the upper end of the right portion of the liquid storage cylinder. A right lower through hole is provided on the lower right side of the lower switch plate corresponding to the position of the second switch rod. A right elastic reset member is provided between the upper end of the second upper piston and the inner side of the upper portion of the second liquid storage chamber.

[0022] During the process in which the volume of the medium flowing into the first liquid pipe reaches the first set value: the first lower piston moves upward and drives the first upper piston to move upward together, the upper end of the first switch rod first passes through the lower left through hole to make the lower switch plate move to the left, the lower hook is locked in the lower clamping groove, the upper end of the first switch rod then passes through the upper left through hole and pushes up the upper hook to separate the upper hook and the upper clamping groove, the upper elastic reset member resets, the upper switch plate moves to the left, the upper switch plate and the lower switch plate move to the left to connect the liquid inlet with the second liquid pipe, and the liquid outlet opening and closing mechanism makes the first inner liquid outlet and the first outer liquid outlet disconnected, and the second inner liquid outlet and the second outer liquid outlet connect with each other;

[0023] During the process in which the volume of the medium flowing into the second liquid pipe reaches the second set value: the second lower piston moves upward and then moves upward together with the second upper piston, the upper end of the second switch rod passes through the lower right through hole and pushes up the lower hook so that the lower hook and the lower slot are separated from each other, after the left elastic reset member is reset, the first switch rod moves downward and separates from the lower switch plate, the lower elastic reset member is reset, the lower switch plate and the upper switch plate move to the right so that the liquid inlet hole is connected to the first liquid pipe, and the liquid outlet opening and closing mechanism makes the first inner liquid outlet hole and the first outer liquid outlet hole connected to each other, and the second inner liquid outlet hole and the second outer liquid hole are disconnected from each other.

[0024] The above-mentioned liquid outlet opening and closing mechanism may include a left sealing plate, a right sealing plate, a first communicating vessel, a second communicating vessel, a first fixing rod and a second fixing rod. A left sealing plate with an opening facing right and in an arc shape is installed between the outer side of the left portion of the liquid storage cylinder and the inner side of the outer cylinder. A first liquid passage hole is provided on the outer side of the left sealing plate, which can be connected to the first inner liquid outlet hole and the first outer liquid outlet hole after moving downward. A right sealing plate with an opening facing left and in an arc shape is installed between the outer side of the right portion of the liquid storage cylinder and the inner side of the outer cylinder. A second liquid passage hole is provided on the outer side of the right sealing plate, which can be connected to the second inner liquid outlet hole and the second outer liquid outlet hole after moving downward.

[0025] The cam is secured to the upper edge of the first support frame, and the cam is secured to the lower edge of the first support frame by an outer thread of the second threaded cannula.

[0026] A second switch chamber is provided in the second liquid inlet channel corresponding to the position between the lower switch plate and the second liquid passage pipe. A second communicating vessel with the same structure as the first communicating vessel is provided in the second switch chamber. A second strip-shaped sliding hole communicating with the second switch chamber is provided on the outer side of the front of the liquid inlet column. A second fixing rod with a rear end fixedly installed at a corresponding position of the second communicating vessel is slidably installed in the second sliding hole. The front end of the second fixing rod is fixedly installed at the upper portion of the left sealing plate.

[0027] When the medium flows into the first liquid passage, the first sleeve moves downward and connects the second inner liquid outlet with the second outer liquid outlet through the first fixing rod and the right sealing plate. At the same time, when the medium does not flow into the second liquid passage, the second communicating vessel disconnects the first inner liquid outlet from the first outer liquid outlet through the second fixing rod and the left sealing plate.

[0028] When the medium flows into the second liquid pipe, the second communicating device communicates with the first inner liquid outlet and the first outer liquid outlet through the second fixed rod and the left sealing plate. At the same time, the medium does not flow into the first liquid pipe. After the first sleeve moves upward, it passes through the first fixed rod and the right sealing plate so that the second inner liquid outlet and the second outer liquid outlet are not connected to each other.

[0029] The left side of the upper part of the above-mentioned upper left through hole may have a first inclined surface, the upper part of the first inclined surface is inclined to the left relative to the lower part, the left side of the lower part of the lower left through hole has a second inclined surface, the lower part of the second inclined surface is inclined to the left relative to the upper part, and the inner wall of the upper part of the lower right through hole has a third inclined surface, the upper part of the third inclined surface is inclined to the right relative to the lower part.

[0030] The left side of the upper end of the above-mentioned first switch rod may have a fourth inclined surface matching the second inclined surface, and the left side of the upper end of the first switch rod corresponding to the upper hook position is provided with an upper limit groove opening upward and passing through left and right, and the outer side of the lower part of the first switch rod is fixedly installed with a first limit ring in contact with the upper end of the liquid storage cylinder, and the left side of the upper end of the second switch rod corresponding to the lower hook position is provided with a lower limit groove opening upward and passing through left and right, and the outer side of the lower part of the second switch rod is fixedly installed with a second limit ring in contact with the upper end of the liquid storage cylinder.

[0031] An upper hinge ear can be fixedly installed on the left side of the liquid inlet column corresponding to the position above the upper switch plate, and an upper hinge pin can be rotatably installed in the upper hinge ear. The upper hinge pin is hingedly installed with the right part of the upper hook, and a first torsion spring is sleeved on the outer side of the upper hinge pin, which can make the lower side of the left part of the upper hook resist against the upper side of the upper switch plate. A lower hinge ear is fixedly installed on the right side of the liquid inlet column corresponding to the position above the lower switch plate, and a lower hinge pin is rotatably installed in the lower hinge ear. The lower hinge pin is hingedly installed with the left part of the lower hook, and a second torsion spring is sleeved on the outer side of the lower hinge pin, which can make the lower side of the right part of the lower hook resist against the upper side of the lower switch plate.

[0032] The left limit column can be fixed on the inner side of the lower part of the outer cylinder corresponding to the left position of the above-mentioned partition plate, and the lower end of the liquid storage cylinder corresponding to the position of the left limit column is provided with a left fixing hole that passes through from top to bottom, and the left limit cylinder that is sleeved on the outer side of the left limit column is sealed and fixed in the left fixing hole, and the upper end of the left limit cylinder is in contact with the lower end of the first lower piston, and the right limit column is fixed on the inner side of the lower part of the outer cylinder corresponding to the right position of the partition plate, and the lower end of the liquid storage cylinder corresponding to the position of the right limit column is provided with a right fixing hole that passes through from top to bottom, and the right limit cylinder that is sleeved on the outer side of the right limit column is sealed and fixed in the right fixing hole, and the upper end of the right limit cylinder is in contact with the lower end of the second lower piston.

[0033] The present invention has a reasonable and compact structure. During the process of injecting the medium into the first liquid pipe to a volume reaching a first set value, the first inner liquid outlet hole and the first outer liquid outlet hole are not connected to each other, and the second inner liquid outlet hole and the second outer liquid outlet hole are connected to each other. The medium flows into the first liquid storage chamber below the first lower piston through the first liquid pipe, and at the same time, the medium enters the second liquid storage chamber above the second lower piston through the first communicating hole. As the medium is continuously injected, the first lower piston moves upward, so that the liquid storage volume gradually increases. When the volume of the injected medium reaches the first set value, the first lower piston moves upward to the highest point. At this time, the linkage component causes the switching switch to operate. After the switching switch is operated, the first liquid inlet channel is closed and the second liquid inlet channel is opened, thereby realizing the storage of the medium.

[0034] In the process of injecting the volume into the second liquid pipe to the second set value, the first inner liquid outlet hole and the first outer liquid outlet hole are connected to each other, and the second inner liquid outlet hole and the second outer liquid outlet hole are not connected to each other. The stored medium flows out through the first outer liquid outlet hole to perform a fracturing operation on the formation, and the medium flows into the second liquid storage chamber below the second lower piston through the second liquid pipe. As the medium is continuously injected, the second lower piston moves upward, so that the injected medium can be stored in the second liquid storage chamber below the second lower piston. At the same time, after the second lower piston moves upward, the medium stored above the second lower piston can be discharged through the first communicating hole and the first liquid storage chamber. And the first liquid outlet after the outer cylinder is discharged, so that the stored medium can be discharged more thoroughly, ensuring the volume of the next stored liquid, and also ensuring the flow rate and pressure when the medium is discharged. When the volume of the injected medium reaches the second set value, the second lower piston moves upward to the highest point. At this time, the linkage component causes the switching switch to operate. After the switching switch is operated, the second liquid inlet channel is closed and the first liquid inlet channel is opened, thus realizing the fracturing operation. The energy storage and release of the gas storage device are completed through the cooperation of the linkage component and the switching switch. This device can not only prevent the leakage of the pressurized medium, but also adjust the release speed of the pressurized medium.

[0035] In this way, the dual-chamber fracturing device can realize fracturing operations at multiple target locations underground.

[0036] The first lower piston and the second lower piston are set. By injecting fracturing medium into the first liquid storage chamber below the first lower piston, the first lower piston can move upward. After the first lower piston moves up and down, the switching switch can be activated by the linkage component, thereby realizing the switching of the injection direction of the fracturing medium from the first liquid storage chamber to the second liquid storage chamber. Similarly, by injecting fracturing medium into the second liquid storage chamber below the second lower piston, the second lower piston can move upward. After the second lower piston moves up and down, the switching switch can be activated by the linkage component, thereby realizing the switching of the injection direction of the fracturing medium from the second liquid storage chamber to the first liquid storage chamber. In this way, reliable control of downhole fracturing operations can be achieved. By setting the first connecting hole, the liquid storage volume can be increased, which can ensure the fracturing effect. In this way, the dual-chamber fracturing device is lowered into the target fracturing position, and the fracturing position can be fracturing after continuously injecting fracturing fluid into the liquid inlet hole. The operation difficulty is low and the operation efficiency can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Attachment Figure 1 Schematic diagrams of the main cross-sectional structures of the present invention one to ten.

[0038] Attachment Figure 2 For attachment Figure 1 Schematic diagram of the enlarged cross-sectional structure at AA in the middle.

[0039] Attachment Figure 3 For attachment Figure 1Schematic diagram of the enlarged cross-section structure at the middle BB.

[0040] Attachment Figure 4 For attachment Figure 1 Schematic diagram of the enlarged cross-section structure at CC in the middle.

[0041] Attachment Figure 5 For attachment Figure 1 Schematic diagram of the enlarged cross-section structure at DD in the middle.

[0042] Attachment Figure 6 For attachment Figure 1 Schematic diagram of the enlarged cross-sectional structure at EE in the middle.

[0043] Attachment Figure 7 For attachment Figure 1 Schematic diagram of the enlarged cross-sectional structure at FF in the middle.

[0044] Attachment Figure 8 For attachment Figure 1 Schematic diagram of the enlarged cross-section structure at GG in the middle.

[0045] Attachment Figure 9 For attachment Figure 1 Schematic diagram of the enlarged cross-sectional structure at HH in the middle.

[0046] Attachment Figure 10 For attachment Figure 1 Schematic diagram of the enlarged cross-section structure at II in the middle.

[0047] Attachment Figure 11 For attachment Figure 1 Schematic diagram of the enlarged structure at J in the middle.

[0048] Attachment Figure 12 This is a schematic diagram of the three-dimensional structure of the present invention after removing the outer cylinder. Figure 1 .

[0049] Attachment Figure 13 For attachment Figure 12 Schematic diagram of the enlarged structure at K in the middle.

[0050] Attachment Figure 14 This is a schematic diagram of the three-dimensional structure of the present invention after removing the outer cylinder. Figure 2 .

[0051] Attachment Figure 15 This is a rear view structural diagram of the present invention after the outer cylinder is removed.

[0052] Attachment Figure 16 This is a schematic diagram of the three-dimensional structure of the present invention after the outer cylinder and the liquid storage cylinder are dismantled.

[0053] Attachment Figure 17 Schematic diagrams of the top view of the liquid storage cylinders (with the cylinder covers removed) of the present invention.

[0054] Attachment Figure 18 For attachment Figure 17 Schematic diagram of the enlarged cross-sectional structure at LL.

[0055] Attachment Figure 19 For attachment Figure 17 Schematic diagram of the enlarged cross-section structure at MM in the middle.

[0056] Attachment Figure 20 For attachment Figure 17 Schematic diagram of the enlarged cross-sectional structure at NN in the middle.

[0057] The codes in the accompanying drawings are: 1 is the outer cylinder, 2 is the liquid storage cylinder, 3 is the partition plate, 4 is the first liquid storage chamber, 5 is the second liquid storage chamber, 6 is the first communicating hole, 7 is the first lower piston, 8 is the second lower piston, 9 is the liquid inlet column, 10 is the first liquid inlet channel, 11 is the second liquid inlet channel, 12 is the first liquid pipe, 13 is the second liquid pipe, 14 is the first inner liquid outlet hole, 15 is the first outer liquid outlet hole, 16 is the second inner liquid outlet hole, 17 is the second outer liquid outlet hole, 18 is the liquid inlet pipe, 19 is the upper switch plate, 20 is Lower switch plate, 21 is the first upper switch hole, 22 is the second upper switch hole, 23 is the first lower switch hole, 24 is the second lower switch hole, 25 is the sliding groove, 26 is the connecting rod, 27 is the upper hook, 28 is the upper elastic return member, 29 is the upper slot, 30 is the lower hook, 31 is the lower elastic return member, 32 is the lower slot, 33 is the first upper piston, 34 is the first switch rod, 35 is the second upper piston, 36 is the second switch rod, 37 is the lower left through hole, 38 is the upper left through hole, 39 is the left elastic return member, 40 is the right elastic reset member, 41 is the right lower through hole, 42 is the left sealing plate, 43 is the right sealing plate, 44 is the first fixing rod, 45 is the second fixing rod, 46 is the second communicating vessel, 47 is the first liquid hole, 48 is the second liquid hole, 49 is the first switch chamber, 50 is the second switch chamber, 51 is the first base, 52 is the first sleeve, 53 is the first elastic reset member, 54 is the first connecting core, 55 is the first connecting channel, 56 is the first limit outer ring platform, 57 is the first section flow hole, 58 is the first Sliding hole, 59 is the second sliding hole, 60 is the first inclined surface, 61 is the second inclined surface, 62 is the third inclined surface, 63 is the fourth inclined surface, 64 is the upper limit groove, 65 is the lower limit groove, 66 is the first limit ring, 67 is the second limit ring, 68 is the upper hinge ear, 69 is the upper hinge pin, 70 is the first torsion spring, 71 is the lower hinge ear, 72 is the lower hinge pin, 73 is the second torsion spring, 74 is the left limit column, 75 is the left limit cylinder, 76 is the right limit column, 77 is the right limit cylinder, and 78 is the second connecting hole. DETAILED DESCRIPTION

[0058] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0059] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 The positional relationships of front, back, top, bottom, left, and right are described in the layout of the manual. Figure 1 The layout direction is determined by the

[0060] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0061] Example 1: As shown in the attached Figure 1 、 7 , 8, 9, 10, 12 to 20, the dual-chamber fracturing device includes a liquid storage cylinder 2, a switch, a linkage assembly and an outer cylinder 1 with a closed inner cavity, the upper end of the outer cylinder 1 is provided with a liquid inlet hole communicating with the inside and outside, the lower inner side of the outer cylinder 1 is sleeved with the liquid storage cylinder 2, and a partition plate 3 is fixedly installed in the center of the liquid storage cylinder 2, the partition plate 3 divides the liquid storage cylinder 2 into a first liquid storage chamber 4 and a second liquid storage chamber 5, a first communicating hole 6 is provided in the partition plate 3, the lower end of the first communicating hole 6 is communicated with the lower part of the first liquid storage chamber 4, and the upper end of the first communicating hole 6 is connected to the upper part of the second liquid storage chamber 5 A first lower piston 7 is sealingly and slidingly installed in the first liquid storage chamber 4, a second lower piston 8 is sealingly and slidingly installed in the second liquid storage chamber 5, a liquid inlet column 9 is fixedly installed on the upper end of the liquid storage cylinder 2, a first liquid inlet channel 10 and a second liquid inlet channel 11 are spaced apart at the upper end of the liquid inlet column 9, a first liquid passage 12 is fixedly installed on the lower end of the first liquid inlet channel 10, the lower end of the first liquid passage 12 seals and passes through the lower end of the first lower piston 7, a second liquid passage 13 is fixedly installed on the lower end of the second liquid inlet channel 11, and the lower end of the second liquid passage 13 seals and passes through the lower end of the second lower piston 8.

[0062] A switching switch is provided on the upper part of the liquid inlet column 9. When the switching switch is actuated, the liquid inlet hole can be connected to the first liquid pipe 12 or the second liquid pipe 13. A first inner liquid outlet hole 14 is provided on the outer side of the left part of the liquid storage cylinder 2, and a first outer liquid outlet hole 15 corresponding to the first inner liquid outlet hole 14 is provided on the outer side of the left part of the outer cylinder 1. A second inner liquid outlet hole 16 is provided on the outer side of the right part of the liquid storage cylinder 2, and a second outer liquid outlet hole 17 corresponding to the second inner liquid outlet hole 16 is provided on the outer side of the right part of the outer cylinder 1.

[0063] A linkage component is provided in the liquid storage cylinder 2, and when the volume of the medium flowing into the first liquid tube 12 reaches a first set value, the linkage component can cause the switching switch to operate so that the liquid inlet is connected to the second liquid tube 13, the first inner liquid outlet 14 and the first outer liquid outlet 15 are not connected to each other, and the second inner liquid outlet 16 and the second outer liquid outlet 17 are connected to each other; when the volume of the medium flowing into the second liquid tube 13 reaches a second set value, the linkage component can cause the switching switch to operate again so that the liquid inlet is connected to the first liquid tube 12, the first inner liquid outlet 14 and the first outer liquid outlet 15 are connected to each other, and the second inner liquid outlet 16 and the second outer liquid outlet 17 are not connected to each other.

[0064] According to the needs, sealing rings are provided on the outside of the first lower piston 7 and the outside of the second lower piston 8, so that the first lower piston 7 and the second lower piston 8 can be in sealing contact with the inner wall of the liquid storage chamber when they move up and down, and sealing rings are also provided between the first lower piston 7 and the first liquid pipe 12, as well as between the second lower piston 8 and the second liquid pipe 13, so that the first lower piston 7 and the second lower piston 8 can be in sealing contact with the outside of the liquid pipe when they move up and down. In order to prevent the first lower piston 7 and the first liquid pipe 12 from separating from each other, a first limiting ring platform can be provided on the outside of the lower end of the first liquid pipe 12, and a first limiting column can also be provided at the lower end of the first lower piston 7. The lower end of the first limiting column is fixed to the inner side of the left part of the liquid storage cylinder 2, and at least one first limiting plate can be fixed circumferentially in the first liquid storage chamber 4. The first limiting plate The lower side of the positioning plate is located above the first inner liquid outlet hole 14 and above the lower end of the first communicating hole 6. The upper side of the first limit plate is in contact with the lower end of the first lower piston 7. Similarly, in order to prevent the second lower piston 8 from separating from the second liquid passage 13, a second limit ring platform can be provided on the outer side of the lower end of the second liquid passage 13, and a second limit column can also be provided at the lower end of the second lower piston 8. The lower end of the second limit column is fixed to the inner side of the right part of the liquid storage cylinder 2. At least one second limit plate can be fixed circumferentially in the second liquid storage chamber 5. The lower side of the second limit plate is located above the second inner liquid outlet hole 16, and the upper side of the second limit plate is in contact with the lower end of the second lower piston 8. For ease of installation, the outer cylinder 1 and the liquid storage cylinder 2 can both be composed of a cylinder body and a cylinder cover and a cylinder body that are detachably fixed to the upper and lower ends of the cylinder body.

[0065] The switching switch may include an existing well-known two-position three-way solenoid valve, a first solenoid valve and a second solenoid valve. When the two-position three-way solenoid valve coil is not energized, the liquid inlet is connected to the first liquid pipe 12. After the two-position three-way solenoid valve coil is energized, the liquid inlet is connected to the second liquid pipe 13. When the first solenoid valve is energized, the first inner liquid outlet 14 and the first outer liquid outlet 15 are connected to each other. When the first solenoid valve is de-energized, the first inner liquid outlet 14 and the first outer liquid outlet 15 are not connected to each other. When the second solenoid valve is de-energized, the second inner liquid outlet 16 and the second outer liquid outlet 17 are not connected to each other. When the second solenoid valve is energized, the second inner liquid outlet 16 and the second outer liquid outlet 17 are connected to each other. In the initial state, the two-position three-way solenoid valve coil and the first solenoid valve are not energized, and the second solenoid valve is energized.

[0066] The linkage assembly may include an existing well-known pressure sensor and controller (UC51x solenoid valve controller). Pressure sensors are provided at the lower end of the first lower piston 7 and the lower end of the second lower piston 8. Both pressure sensors are connected to the controller, which is electrically connected to the two-position three-way solenoid valve. The pressure sensors collect real-time pressures in the first liquid storage chamber 4 below the first lower piston 7 and the second liquid storage chamber 5 below the second lower piston 8. When the volume of the medium flowing into the first liquid pipe 12 reaches a first set value, the first lower piston 7 moves to the highest position. The pressure data collected by the left pressure sensor is the same as the medium pressure data. The controller energizes the coil of the two-position three-way solenoid valve, connecting the liquid inlet hole to the second liquid pipe 13. The controller energizes the first solenoid valve, connecting the first inner liquid outlet hole 14 to the first outer liquid outlet hole 15. The controller de-energizes the second solenoid valve, disconnecting the second inner liquid outlet hole 16 from the second outer liquid outlet hole 17, and discharging the stored medium from the first inner liquid outlet hole 14.

[0067] When the volume of the medium flowing into the second liquid pipe 13 reaches the second set value, the second lower piston 8 moves up to the highest position, and the pressure data collected by the pressure sensor on the right is the same as the medium pressure data. The controller cuts off the power to the two-position three-way solenoid valve coil, and the liquid inlet hole is connected to the first liquid pipe 12. The controller cuts off the power to the first solenoid valve, and the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15 are not connected to each other. The controller energizes the second solenoid valve, and the second inner liquid outlet hole 16 and the second outer liquid outlet hole 17 are connected to each other, and the stored medium is discharged from the second inner liquid outlet hole 16.

[0068] In the initial state, the switch is switched so that the liquid inlet hole is connected to the first liquid pipe 12, and the liquid inlet hole and the second liquid pipe 13 are not connected to each other. The first lower piston 7 is located outside the lower end of the first liquid pipe 12, and is located above the first inner liquid outlet hole 14 and the lower end of the first communication hole 6. The second lower piston 8 is located outside the lower end of the second liquid pipe 13, and is located above the second inner liquid outlet hole 16; the first inner liquid outlet hole 14 and the first outer liquid hole 15 are not connected to each other, and the second inner liquid outlet hole 16 and the second outer liquid hole 17 are connected to each other.

[0069] In the process of injecting the medium into the first liquid pipe 12 to a first set value, the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15 are not connected to each other, and the second inner liquid outlet hole 16 and the second outer liquid outlet hole 17 are connected to each other. The medium flows into the first liquid storage chamber 4 below the first lower piston 7 through the first liquid pipe 12. At the same time, the medium enters the second liquid storage chamber 5 above the second lower piston 8 through the first communicating hole 6. As the medium is continuously injected, the first lower piston 7 moves upward, so that the liquid storage volume gradually increases. When the volume of the injected medium reaches the first set value, the first lower piston 7 moves upward to the highest point. At this time, the linkage component causes the switching switch to operate. After the switching switch is operated, the first liquid inlet channel 10 is closed and the second liquid inlet channel 11 is opened, thereby realizing the storage of the medium.

[0070] During the process of injecting the volume into the second liquid pipe 13 to the second set value, the first inner liquid outlet 14 and the first outer liquid outlet 15 are connected to each other, and the second inner liquid outlet 16 and the second outer liquid outlet 17 are not connected to each other. The medium during storage flows out through the first outer liquid outlet 15 to perform fracturing operations on the formation, and the medium flows into the second liquid storage chamber 5 below the second lower piston 8 through the second liquid pipe 13. As the medium is continuously injected, the second lower piston 8 moves upward, so that the injected medium can be stored in the second liquid storage chamber 5 below the second lower piston 8. At the same time, after the second lower piston 8 moves upward, the medium stored above the second lower piston 8 can be discharged through the first communicating hole 6. The outer cylinder 1 is discharged after the first liquid storage chamber 4 and the first liquid outlet, so that the stored medium can be discharged more thoroughly, ensuring the volume of the liquid stored next time, and also ensuring the flow rate and pressure when the medium is discharged. When the volume of the injected medium reaches the second set value, the second lower piston 8 moves upward to the highest point. At this time, the linkage component causes the switching switch to operate. After the switching switch is operated, the second liquid inlet channel 11 is closed and the first liquid inlet channel 10 is opened, thus realizing the fracturing operation. The energy storage and release of the gas storage device are completed through the cooperation of the linkage component and the switching switch. This device can not only prevent the leakage of the pressurized medium, but also adjust the release speed of the pressurized medium.

[0071] In this way, the dual-chamber fracturing device can realize fracturing operations at multiple target locations underground, and the medium can be the existing well-known supercritical carbon dioxide.

[0072] The first lower piston 7 and the second lower piston 8 are configured such that, by injecting fracturing medium into the first liquid storage chamber 4 below the first lower piston 7, the first lower piston 7 can be moved upward. After the first lower piston 7 moves up and down, a linkage assembly can be used to activate a switch, thereby switching the injection direction of the fracturing medium from the first liquid storage chamber 4 (below the first lower piston 7) to the second liquid storage chamber 5 (below the second lower piston 8). Similarly, by injecting fracturing medium into the second liquid storage chamber 5 below the second lower piston 8, the second lower piston 8 can be moved upward. After the second lower piston 8 moves up and down, a linkage assembly can be used to activate a switch, thereby switching the injection direction of the fracturing medium from the second liquid storage chamber 5 to the first liquid storage chamber 4. This allows for reliable control of downhole fracturing operations. The provision of the first communicating hole 6 increases the liquid storage volume, thereby ensuring a good fracturing effect. Thus, the dual-chamber fracturing device is lowered into the target fracturing location, and after continuously injecting fracturing fluid into the liquid inlet, fracturing operations can be carried out at the fracturing location. This reduces operational difficulty and significantly improves operational efficiency.

[0073] The above dual-chamber fracturing device can be further optimized and / or improved according to actual needs:

[0074] Example 2: As an optimization of the above example, as shown in the attached Figure 1 、 7 As shown in FIG20 , a liquid inlet pipe 18 is fixedly mounted on the upper end of the outer cylinder 1, and the lower end of the liquid inlet pipe 18 is respectively connected to the upper end of the first liquid inlet channel 10 and the upper end of the second liquid inlet channel 11. The upper end of the liquid inlet pipe 18 is sealed and passes through the liquid inlet hole and is located above the outer cylinder 1. A second communicating hole 78 is provided in the partition plate 3. The lower end of the second communicating hole 78 is connected to the second liquid storage chamber 5 below the second lower piston 8, and the upper end of the second communicating hole 78 is connected to the upper part of the first liquid storage chamber 4.

[0075] As needed, the liquid inlet pipe 18 is shaped like an inverted Y. In the initial state, the first lower piston 7 is located outside the lower end of the first liquid passage 12, below the lower end of the first communication hole 6 and above the first inner liquid outlet 14. The second lower piston 8 is located outside the lower end of the second liquid passage 13, below the lower end of the second communication hole 78 and above the second inner liquid outlet 16. The second communication hole 78 and the first communication hole 6 are spaced apart from each other.

[0076] During use, through such a setting, the injection switching of the medium in the first liquid inlet channel 10 and the second liquid inlet channel 11 can be realized, so that when the medium is injected into the first liquid inlet channel 10, the liquid storage operation of the dual-chamber fracturing device is realized, and when the medium is injected into the second liquid inlet channel 11, the fracturing and liquid storage operation of the dual-chamber fracturing device is realized, and when the medium is injected into the first liquid inlet channel 10 again, the fracturing and liquid storage operation of the dual-chamber fracturing device is realized again.

[0077] In the process of injecting the medium into the first liquid pipe 12 to a first set value, the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15 are not connected to each other, and the second inner liquid outlet hole 16 and the second outer liquid outlet hole 17 are connected to each other. The medium flows into the first liquid storage chamber 4 below the first lower piston 7 through the first liquid pipe 12. At the same time, the medium enters the second liquid storage chamber 5 above the second lower piston 8 through the first communicating hole 6. As the medium is continuously injected, the first lower piston 7 moves upward, so that the liquid storage volume gradually increases. When the volume of the injected medium reaches the first set value, the first lower piston 7 moves upward to the highest point. At this time, the linkage component causes the switching switch to operate. After the switching switch is operated, the first liquid inlet channel 10 is closed and the second liquid inlet channel 11 is opened, thereby realizing the storage of the medium.

[0078] In the process of injecting the volume into the second liquid pipe 13 to the second set value, the first inner liquid outlet 14 is connected to the first outer liquid outlet 15, and the second inner liquid outlet 16 is not connected to the second outer liquid outlet 17. The stored medium flows out through the first outer liquid outlet 15 to perform a fracturing operation on the formation, and the medium flows into the second liquid storage chamber 5 below the second lower piston 8 through the second liquid pipe 13. As the medium is continuously injected, the second lower piston 8 moves upward, so that the injected medium can be stored in the second liquid storage chamber 5 below the second lower piston 8, the second communicating hole 78 and the first liquid storage chamber 4 above the first lower piston 7. At the same time, after the second lower piston 8 moves upward, the medium stored above the second lower piston 8 can be discharged through the first communicating hole 6, the first storing hole 78 and the first storing hole 78. The liquid cavity 4 and the first liquid outlet are then discharged from the outer tube 1, and the injected medium flows into the first liquid storage cavity 4 above the first lower piston 7 through the second communicating hole 78, so that the stored medium can be discharged more thoroughly, ensuring the volume of the liquid stored next time, and also ensuring the flow rate and pressure when the medium is discharged. When the volume of the injected medium reaches the second set value, the second lower piston 8 moves upward to the highest point. At this time, the linkage component causes the switching switch to operate. After the switching switch is operated, the second liquid inlet channel 11 is closed and the first liquid inlet channel 10 is opened, thus realizing the fracturing operation. The energy storage and release of the gas storage device are completed through the cooperation of the linkage component and the switching switch. This device can not only prevent the leakage of the pressurized medium, but also adjust the release speed of the pressurized medium.

[0079] In this way, the dual-chamber fracturing device can realize fracturing operations at multiple target locations underground. During the fracturing process, it can also store media at the same time, thereby improving the utilization rate of the dual-chamber fracturing device.

[0080] Example 3: As an optimization of the above embodiment, as shown in the attached Figures 1 to 4, 9 to 16, the switch includes an upper switch plate 19 and a lower switch plate 20, and the liquid inlet column 9 corresponding to the position between the liquid inlet pipe 18 and the first liquid through pipe 12 is spaced apart with upper and lower mounting holes and lower mounting holes that pass through the left and right sides. The middle of the upper mounting hole and the middle of the lower mounting hole are respectively connected to the first liquid inlet channel 10 and the second liquid inlet channel 11. The upper switch plate 19 is slidably installed in the upper mounting hole. The upper left side of the upper switch plate 19 is provided with a first upper switch hole 21 corresponding to the first liquid inlet channel 10, and an upper switch hole 22 corresponding to the right position of the second liquid inlet channel 11. A second upper switch hole 22 is provided on the right side of the closing plate 19, and a lower switch plate 20 is slidably installed in the lower mounting hole. A first lower switch hole 23 corresponding to the first liquid inlet channel 10 is provided on the upper side of the left portion of the lower switch plate 20, and a second lower switch hole 24 is provided on the right side of the lower switch plate 20 corresponding to the right position of the second liquid inlet channel 11. A sliding groove 25 is provided on the lower side of the right portion of the upper switch plate 19, and a connecting rod 26 with an upper end slidably installed in the sliding groove 25 is fixedly installed on the upper side of the lower switch plate 20, or an elastic rod is fixedly installed between the lower switch plate 20 and the upper switch plate 19.

[0081] When the volume of the medium flowing into the first liquid pipe 12 reaches a first set value, the linkage assembly can cause the upper switch plate 19 and the lower switch plate 20 to move to the left so that the liquid inlet is connected to the second liquid pipe 13, and the first inner liquid outlet 14 and the first outer liquid outlet 15 are disconnected from each other; when the volume of the medium flowing into the second liquid pipe 13 reaches a second set value, the linkage assembly can cause the upper switch plate 19 and the lower switch plate 20 to move to the right so that the liquid inlet is connected to the first liquid pipe 12, the first inner liquid outlet 14 and the first outer liquid outlet 15 are connected to each other, and the second inner liquid outlet 16 and the second outer liquid outlet 17 are disconnected from each other.

[0082] As required, the first upper switch hole 21 and the second lower switch hole 24 are both through holes. The upper switch plate 19 and the lower switch plate 20 are in sealing contact with the inner walls of the upper mounting hole and the inner walls of the lower mounting hole, respectively, during left and right movement (multiple sealing rings can be provided on the outer sides of the upper switch plate 19 and the outer sides of the lower switch plate 20 at intervals on the left and right sides). Two strip-shaped sliding grooves 25 are provided on the lower side of the upper switch plate 19 corresponding to the right side of the liquid inlet column 9. The distance between the left inner wall and the right inner wall of the sliding groove 25 is the same as the center distance between the first upper switch hole 21 and the second upper switch hole 22. The elastic rod can be made of a conventionally known elastic material, such as rubber. The first lower switch hole 23 is oblong. The projection of the first liquid inlet channel 10 on the horizontal plane coincides with the left portion of the projection of the first lower switch hole 23 on the horizontal plane. That is, the right inner wall of the first lower switch hole 23 is located in the lower switch plate 20 between the first liquid inlet channel 10 and the second liquid inlet channel 11, and the left inner wall of the first lower switch hole 23 coincides with the projection of the left inner wall of the first liquid inlet channel 10.

[0083] In the initial state, the linkage assembly makes the first upper switch hole 21 and the first lower switch hole 23 correspond to each other up and down, and the first upper switch hole 21 and the first lower switch hole 23 are both connected to the first liquid inlet channel 10, and the first liquid inlet channel 10 is opened. At the same time, the second upper switch hole 22 and the second lower switch hole 24 are both located to the right of the second liquid inlet channel 11, and the second liquid inlet channel 11 is closed. The upper end of the connecting rod 26 is located at the right end of the sliding groove 25, or the elastic rod between the lower switch plate 20 and the upper switch plate 19 is in a natural state, the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15 are not connected to each other, and the second inner liquid outlet hole 14 and the second outer liquid outlet hole 15 are connected to each other.

[0084] In the process of injecting the volume into the liquid inlet pipe 18 to the first set value, the linkage assembly first moves the lower switch plate 20 to the left. After the first lower switch hole 23 moves to the left, it is still connected to the first liquid inlet channel 10, and the medium continues to flow downward. In this way, the fracturing fluid can be continuously injected into the first liquid storage chamber 4 below the first lower piston 7 and the second liquid storage chamber 5 above the second lower piston 8. At the same time, the second lower switch hole 24 is correspondingly connected to the second liquid inlet channel 11. The upper end of the connecting rod 26 moves to the left in the sliding groove 25, or the elastic rod moves downward. After moving to the left, it bends and deforms; then the linkage assembly causes the upper switch plate 19 to move to the left, and the first upper switch hole 21 moves to the left of the first liquid inlet channel 10, so that the first upper switch hole 21 and the first liquid inlet channel 10 are misaligned with each other, and the upper switch plate 19 closes the upper part of the first liquid inlet channel 10. At this time, the injection volume in the liquid inlet pipe 18 reaches the first set value, and at the same time, the second upper switch hole 22 and the second liquid inlet channel 11 are connected to each other, and the upper end of the connecting rod 26 is again located at the right end of the sliding groove 25, or the elastic rod is reset to its natural state.

[0085] During the process of injecting the medium into the liquid inlet pipe 18 to the second set value, the linkage assembly first causes the lower switch plate 20 to move to the right, and the first lower switch hole 23 remains connected to the first liquid inlet channel 10 after moving. At the same time, the second lower switch hole 24 moves to the right of the second liquid inlet channel 11, and the lower switch plate 20 closes the lower part of the second liquid inlet channel 11. The upper end of the connecting rod 26 presses against the inner wall of the right part of the sliding groove 25 and drives the upper switch plate 19 to move to the right; then the first upper switch hole 21 corresponds to the upper part of the first liquid inlet channel 10, the first liquid inlet channel 10 is opened, and the medium injected into the liquid inlet pipe 18 reaches the second set value. At the same time, the second upper switch hole 22 moves to the right of the second liquid inlet channel 11, and the upper part of the second liquid inlet channel 11 is closed. The upper end of the connecting rod 26 and the right end of the sliding groove 25 contact each other, or the upper end of the elastic rod moves to the right and drives the upper The switch plate 19 moves to the right and finally returns to its natural state. During this process, the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15 are connected to each other, and the fracturing fluid in the first liquid storage chamber 4 below the first lower piston 7 and the second liquid storage chamber 5 above the second lower piston 8 is discharged after passing through the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15, and the injected medium flows into the first liquid storage chamber 4 above the first lower piston 7 through the second connecting hole 78. In this way, the first lower piston 7 can move downward, and it can be ensured that the fracturing fluid is completely discharged, thereby ensuring the fracturing effect. As the medium is continuously injected, the second lower piston 8 moves upward, so that the injected medium can be stored in the second liquid storage chamber 5 below the second lower piston 8, the second connecting hole 78 and the first liquid storage chamber 4 above the first lower piston 7, and can be stored again during the fracturing process.

[0086] Example 4: As an optimization of the above embodiment, as shown in the attached Figures 1 to 4 , 9 to 16, the switching structure also includes an upper positioning mechanism and a lower positioning mechanism. The upper positioning mechanism includes an upper hook 27 and an upper elastic reset member 28. An upper groove 29 is provided on the upper left side of the upper switch plate 19 corresponding to the left position of the liquid inlet column 9. The upper left side of the liquid inlet column 9 is hingedly installed with an upper hook 27, and the lower part of the upper hook 27 is clamped in the upper groove 29. An upper elastic reset member 28 is provided between the right side of the upper switch plate 19 and the inner side of the right part of the outer cylinder 1.

[0087] The lower positioning mechanism includes a lower hook 30 and a lower elastic reset member 31. A lower slot 32 is provided on the upper right side of the lower switch plate 20 corresponding to the right position of the liquid inlet column 9. The lower hook 30 is hingedly installed on the right side of the upper part of the liquid inlet column 9. The lower part of the lower hook 30 can be clamped in the lower slot 32 after the lower switch plate 20 moves to the left. A lower elastic reset member 31 is provided between the left side of the lower switch plate 20 and the inner side of the left part of the outer tube 1.

[0088] When the volume of the medium flowing into the first liquid pipe 12 reaches the first set value, the linkage assembly: the upper hook 27 and the upper slot 29 separate from each other, the upper elastic reset member 28 resets, the upper switch plate 19 and the lower switch plate 20 move to the left to connect the liquid inlet hole with the second liquid pipe 13, the lower hook 30 is clamped in the lower slot 32, the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15 are disconnected from each other, and the second inner liquid outlet hole 16 and the second outer liquid outlet hole 17 are connected to each other.

[0089] When the volume of the medium flowing into the second liquid pipe 13 reaches the second set value, the linkage assembly: the lower hook 30 and the lower slot 32 separate from each other, the lower elastic reset member 31 resets, the upper switch plate 19 and the lower switch plate 20 move to the right to connect the liquid inlet hole with the first liquid pipe 12, the upper hook 27 is clamped in the upper slot 29, the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15 are connected to each other, and the second inner liquid outlet hole 16 and the second outer liquid outlet hole 17 are not connected to each other.

[0090] According to the requirements, the upper elastic return member 28 and the lower elastic return member 31 are existing well-known technologies, such as compression springs. In order to facilitate the disassembly and assembly of the upper elastic return member 28 and the lower elastic return member 31, symmetrically distributed upper disassembly holes are provided on the inner side of the upper part of the outer cylinder 1 corresponding to the position of the upper switch plate 19. An upper top screw is screwed in each upper disassembly hole, and an upper guide sleeve is fixedly installed in the outer cylinder 1 corresponding to each upper disassembly hole position. The upper guide sleeve on the left is provided with a first guide pin whose right end is fixedly installed with the left side of the upper switch plate 19, and the upper guide sleeve on the right is provided with a second guide pin whose left end is fixedly installed with the right side of the upper switch plate 19. The upper elastic return member 28 is installed between the right end of the second guide pin and the right upper top screw.

[0091] Similarly, symmetrically distributed lower disassembly holes are provided on the inner side of the upper part of the outer cylinder 1 corresponding to the position of the lower switch plate 20, and a lower top screw is screwed in each lower disassembly hole. A lower guide sleeve is fixedly installed in the outer cylinder 1 corresponding to the position of each lower disassembly hole, and the left lower guide sleeve is sleeved with a third guide pin whose right end is fixedly installed with the left side of the lower switch plate 20, and a lower elastic reset member 31 is installed between the left end of the third guide pin and the left lower top screw, and the right lower guide sleeve is sleeved with a fourth guide pin whose left end is fixedly installed with the right side of the lower switch plate 20, and the elastic force of the lower elastic reset member 31 is greater than the elastic force of the upper elastic reset member 28.

[0092] In the initial state, the lower part of the upper hook 27 is clamped in the upper slot 29, the first upper switch hole 21 and the first lower switch hole 23 correspond to each other up and down and are both connected to the first liquid inlet channel 10, and the first liquid inlet channel 10 is opened; the lower part of the lower hook 30 is located in the lower right through hole 41. At this time, the lower part of the lower hook 30 can also be against the upper side of the right part of the lower switch plate 20. The second upper switch hole 22 and the second lower switch hole 24 are both located on the right side of the second liquid inlet channel 11, and the second liquid inlet channel 11 is closed. The upper end of the connecting rod 26 is located at the right end of the sliding groove 25, or the elastic rod between the lower switch plate 20 and the upper switch plate 19 is in a natural state, the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15 are not connected to each other, and the second inner liquid outlet hole 14 and the second outer liquid outlet hole 15 are connected to each other.

[0093] In the liquid storage state, the pressurized medium is injected into the upper end of the liquid inlet pipe 18, and the pressurized medium flows into the first liquid storage chamber 4 through the first liquid pipe 12. As the pressurized medium continues to flow in, the pressurized medium flows along the first communicating hole 6 into the second liquid storage chamber 5 above the second lower piston 8. At this time, the linkage component makes the first inner liquid outlet 14 and the first outer liquid outlet 15 disconnected from each other, so that the liquid storage operation can be realized. When the volume of the pressurized medium injected into the liquid inlet pipe 18 reaches the first set value, the linkage component makes the lower switch plate 20 open before the upper switch plate 19 moves to the left, the lower hook 30 is mounted in the lower slot 32, and then the upper hook 27 and the upper slot 29 are separated from each other, and the upper switch plate 19 moves to the left under the action of the upper elastic reset member 28. After the upper switch plate 19 and the lower switch plate 20 both move to the left, the first liquid inlet channel 10 is closed and the second liquid inlet channel 11 is opened. At this time, the injection of pressurized medium is stopped, and the medium is stored in the first liquid storage chamber 4 below the first lower piston 7, the first communicating hole 6 and the second liquid storage chamber 5 above the second lower piston 8.

[0094] In the fracturing state, the dual-chamber fracturing device is lowered into the target position in the well, and the outgoing liquid hole corresponds to the target fracturing position. At this time, the pressurized medium is injected, and the linkage component makes the first inner liquid outlet hole 14 and the first outgoing liquid hole 15 communicate with each other. In this way, in the liquid storage state, the pressurized medium in the first liquid storage chamber 4 below the first lower piston 7, the first communicating hole 6, and the second liquid storage chamber 5 above the second lower piston 8 is discharged through the first inner liquid outlet hole 14 and the first outgoing liquid hole 15 to realize the fracturing operation. When the inflow volume of the second liquid pipe 13 reaches the second set value, the linkage component separates the lower hook 30 from the lower slot 32, and the lower switch plate 20 Under the reset action of the lower elastic reset member 31, it moves to the right. At the same time, the lower switch plate 20 drives the upper switch plate 19 to move to the right through the connecting rod 26. The lower switch plate 20 and the upper switch plate 19 move to the initial position, the second liquid inlet channel 11 is closed, and the first liquid inlet channel 10 is opened. The injected medium flows into the first liquid storage chamber 4 above the first lower piston 7 through the second communicating hole 78, causing the first lower piston 7 to move downward. In this way, the pressurized medium can also be stored in the second liquid storage chamber 5 below the second lower piston 8, the second communicating hole 78 and the first liquid storage chamber 4 above the first lower piston 7 during the fracturing operation.

[0095] In this way, the dual-chamber fracturing device can realize fracturing operations at multiple target locations underground. During the fracturing process, it can also store media at the same time, thereby improving the utilization rate of the dual-chamber fracturing device. Fracturing and storage can be carried out simultaneously.

[0096] Example 5: As an optimization of the above embodiment, as shown in the attached Figures 1 to 4 As shown in , 9 to 16, the linkage assembly includes a switch opening and closing mechanism and a liquid outlet opening and closing mechanism, the switch opening and closing mechanism includes a first upper piston 33, a first switch rod 34, a second upper piston 35 and a second switch rod 36, the first upper piston 33 is slidably installed in the first liquid storage chamber 4 corresponding to the position above the first lower piston 7, the first upper piston 33 is sleeved on the outside of the first liquid tube 12, the upper end of the first upper piston 33 is fixedly installed with a first switch rod 34 corresponding to the upper hook 27, the upper end of the first switch rod 34 is sealed through the upper end of the left part of the liquid storage cylinder 2, the lower left side of the lower switch plate 20 corresponding to the position of the first switch rod 34 is provided with a left lower through hole 37 that passes through from top to bottom, and the lower left side of the upper switch plate 19 corresponding to the position of the lower through hole is provided with a left upper through hole 38 that passes through from top to bottom, and a left elastic reset member 39 is provided between the upper end of the first upper piston 33 and the inner side of the upper part of the first liquid storage chamber 4.

[0097] A second upper piston 35 is slidably installed in the second liquid storage chamber 5 corresponding to the position above the second lower piston 8. The second upper piston 35 is sleeved on the outside of the second liquid tube 13. A second switch rod 36 corresponding to the lower hook 30 is fixedly installed on the upper end of the second upper piston 35. The upper end of the second switch rod 36 seals and passes through the upper end of the right part of the liquid storage cylinder 2. A right lower through hole 41 is provided on the lower right side of the lower switch plate 20 corresponding to the position of the second switch rod 36, and a right elastic reset part 40 is provided between the upper end of the second upper piston 35 and the inner side of the upper part of the second liquid storage chamber 5.

[0098] During the process of the volume of the medium flowing into the first liquid pipe 12 reaching the first set value: the first lower piston 7 moves upward and then drives the first upper piston 33 to move upward together, the upper end of the first switch rod 34 first passes through the lower left through hole 37 to make the lower switch plate 20 move to the left, and the lower hook 30 is clamped in the lower groove 32. The upper end of the first switch rod 34 then passes through the upper left through hole 38 to push up the upper hook 27 so that the upper hook 27 and the upper groove 29 are separated from each other, and the upper elastic reset member 28 is reset, the upper switch plate moves to the left, and the upper switch plate 19 and the lower switch plate 20 move to the left so that the liquid inlet is connected to the second liquid pipe 13. The liquid outlet opening and closing mechanism makes the first inner liquid outlet 14 and the first outer liquid outlet 15 disconnected from each other, and the second inner liquid outlet 14 and the second outer liquid outlet 15 are connected to each other.

[0099] During the process of the volume of the medium flowing into the second liquid pipe 13 reaching the second set value: the second lower piston 8 moves upward and then moves upward together with the second upper piston 35, the upper end of the second switch rod 36 passes through the lower right through hole 41 and then pushes up the lower hook 30 so that the lower hook 30 and the lower slot 32 are separated from each other, after the left elastic reset member 39 is reset, the first switch rod 34 moves downward and separates from the lower switch plate 20, the lower elastic reset member 31 is reset, the lower switch plate 20 and the upper switch plate 19 move to the right so that the liquid inlet hole is connected to the first liquid pipe 12, and the liquid outlet opening and closing mechanism makes the first inner liquid outlet hole 14 and the first outgoing liquid hole 15 connected to each other, and the second inner liquid outlet hole 16 and the second outgoing liquid hole 17 are not connected to each other.

[0100] According to requirements, the upper end of the first upper piston 33 is provided with one to four first drainage holes that pass through from top to bottom, and the upper end of the second upper piston 35 is provided with one to four second drainage holes that pass through from top to bottom. In this way, during the upward movement of the first upper piston 33 and the second upper piston 35, the phenomenon of difficulty in moving after pressure buildup caused by the enclosed space between the upper ends of the first upper piston 33 and the second upper piston 35 and the liquid storage cylinder 2 can be avoided. At the same time, due to the setting of the second drainage holes, the fluid flowing out of the upper end of the first connecting hole 6 can also flow from the second drainage hole into the second liquid storage chamber 5 between the second upper piston 35 and the second lower piston 8. Similarly, due to the setting of the first drainage hole, the fluid flowing out of the upper end of the second connecting hole 78 can also flow from the first drainage hole into the first liquid storage chamber 4 between the first upper piston 33 and the first lower piston 7.

[0101] The left elastic return member 39 and the right elastic return member 40 are both compression springs known in the art. The upper and lower ends of the left elastic return member 39 are respectively mounted on the inner wall of the liquid storage cylinder 2 and the upper end of the first upper piston 33, and the upper and lower ends of the right elastic return member 40 are respectively fixedly mounted on the right inner wall of the liquid storage cylinder 2 and the upper end of the second upper piston 35. The cross-section of the upper part of the lower left through hole 37 matches the cross-section of the upper part of the first switch rod 34, and both cross-sections are rectangular. The spacing between the left inner wall and the right inner wall of the lower part of the upper left through hole 38 is greater than or equal to the center distance between the first upper switch hole 21 and the second upper switch hole 22. In this way, the upper end of the first switch rod 34 can move relative to the upper switch plate 19 after passing through the upper left through hole 38, and the spacing between the left inner wall and the right inner wall of the lower part of the lower right through hole 41 is greater than or equal to the center distance between the second liquid inlet channel 11 and the second lower switch hole 24 in the initial state. In this way, the upper end of the second switch rod 36 can move relative to the lower switch plate 20 after passing through the lower right through hole 41 and lifting the lower hook 30.

[0102] In the initial state, the lower part of the upper hook 27 is clamped in the upper slot 29, the first upper switch hole 21 and the first lower switch hole 23 correspond to each other up and down and are both connected to the first liquid inlet channel 10, and the first liquid inlet channel 10 is opened; the lower part of the lower hook 30 is located in the lower right through hole 41. At this time, the lower part of the lower hook 30 can also be against the upper side of the right part of the lower switch plate 20. The second upper switch hole 22 and the second lower switch hole 24 are both located to the right of the second liquid inlet channel 11, and the second liquid inlet channel 11 is closed. The first inner liquid outlet hole 14 and the first outgoing liquid hole 15 are not connected to each other, and the second inner liquid outlet hole 14 and the second outgoing liquid hole 15 are connected to each other. The left elastic return member 39 and the right elastic return member 40 are both in the natural state, and the upper end of the first switch rod 34 and the upper end of the second switch rod 36 are both located below the lower switch plate 20.

[0103] When the liquid is stored, pressurized medium is injected into the upper end of the liquid inlet pipe 18, and the pressurized medium flows into the first liquid storage chamber 4 below the first lower piston 7 through the first liquid passage 12. As the pressurized medium continues to flow in, the pressurized medium pushes the first lower piston 7 to move upward, and at the same time, the pressurized medium flows along the first communicating hole 6 into the second liquid storage chamber 5 above the second lower piston 8. At this time, the liquid outlet opening and closing mechanism makes the first inner liquid outlet 14 and the first outer liquid outlet 15 disconnected from each other. When the first lower piston 7 moves upward and contacts the lower end of the first upper piston 33, under the action of the pressurized medium, the first lower piston 7 and the first upper piston 33 continue to move upward, the left elastic return member 39 is compressed, and the first switch rod 34 continues to move upward. The upper end of the first switch rod 34 first passes through the lower left through hole 37, causing the lower switch plate 20 to move to the left before the upper switch plate 19. The lower hook 30 is separated from the lower right through hole 41 and then clamped in the lower slot 32. The upper end of the first switch rod 34 then passes through the upper left through hole 38 and lifts the upper hook 27 causes the upper hook 27 and the upper slot 29 to separate from each other, and the upper switch plate 19 moves to the left under the action of the upper elastic return member 28. Both the upper switch plate 19 and the lower switch plate 20 move to the left. Since the first lower switch hole 23 is connected to the first channel 10 when the lower switch plate 20 moves left and right, the lower switch plate 20 first moves to the left, and the medium continues to flow downward, so that the upper end of the first switch rod 34 continues to move upward and then inserts into the upper left through hole 38 to push up the upper hook 27, the first liquid inlet channel 10 is closed, and the second liquid inlet channel 11 is opened, so as to prevent the first switch rod 34 from being unable to move upward so that the upper switch plate 19 moves to the left and then opens the second liquid inlet channel 11. At this time, the volume of the medium flowing into the first liquid pipe 12 reaches the first set value, and the injection of pressurized medium is stopped. The first liquid inlet channel 10 is closed, and the medium is stored in the first liquid storage chamber 4 below the first lower piston 7, the first communicating hole 6, and the second liquid storage chamber 5 above the second lower piston 8, thereby realizing the liquid storage operation.

[0104] During the fracturing state, the dual-chamber fracturing device is lowered into the target position in the well, and the outgoing fluid hole corresponds to the target fracturing position. At this time, pressurized medium is injected, and the pressurized medium causes the fluid hole opening and closing mechanism to operate. After the fluid hole opening and closing mechanism is operated, the first inner fluid hole 14 and the first outgoing fluid hole 15 are connected to each other, and the second inner fluid hole 16 and the second outgoing fluid hole 17 are not connected to each other. In this way, the pressurized medium stored in the first fluid storage chamber 4 below the first lower piston 7, the first communicating hole 6, and the second fluid storage chamber 5 above the second lower piston 8 is discharged through the first inner fluid hole 14 and the first outgoing fluid hole 15. At the same time, the pressurized medium flows into the second fluid storage chamber 5 below the second lower piston 8, the second communicating hole 78, and the first fluid storage chamber 4 above the first lower piston 7 through the second fluid passage 13. When the second lower piston 8 moves upward, the pressurized medium above the second lower piston 8 can be discharged through the first communicating hole 6 into the first fluid storage chamber 4 below the first lower piston 7, and finally discharged. At the same time, the first upper piston 33 also moves downward under the resetting action of the left elastic resetting member 39. After the first upper piston 33 and the first lower piston 7 move downward, the pressurized medium is quickly discharged, realizing the fracturing operation. When the first upper piston 33 moves downward to the initial position, the first switch rod 34 separates from the upper switch plate 19 and the lower switch plate 20 in sequence. At the same time, the second lower piston 8 and the second upper piston 35 move upward. The second switch rod 36 moves upward and then inserts into the lower right through hole 41, and then pushes up the lower hook 30 so that the lower hook 30 and the lower groove 32 are separated from each other. The lower switch plate 20 moves to the right under the action of the lower elastic return member 31. At this time, the volume of the medium flowing into the second liquid pipe 13 reaches the second set value. At the same time, the lower switch plate 20 drives the upper switch plate 19 to move leftward through the connecting rod 26 until the lower switch plate 20 and the upper switch plate 19 move to the initial position. The second liquid inlet channel 11 is closed, and the first liquid inlet channel 10 is opened. In this way, during the fracturing operation, the pressurized medium can also be stored in the second liquid storage chamber 5 below the second lower piston 8, the second communicating hole 78, and the first liquid storage chamber 4 above the first lower piston 7.

[0105] In this way, the dual-chamber fracturing device can realize fracturing operations at multiple target locations underground. During the fracturing process, it can also store media at the same time, thereby improving the utilization rate of the dual-chamber fracturing device.

[0106] Example 6: As an optimization of the above embodiment, as shown in the attached Figures 1 to 15As shown, the liquid outlet opening and closing mechanism includes a left sealing plate 42, a right sealing plate 43, a first communicating vessel, a second communicating vessel 46, a first fixing rod 44 and a second fixing rod 45. A left sealing plate 42 with an opening to the right and an arc shape is installed between the outer side of the left portion of the liquid storage cylinder 2 and the inner side of the outer cylinder 1. A first liquid passage hole 47 is provided on the outer side of the left sealing plate 42, which can connect the first inner liquid outlet hole 14 and the first outer liquid outlet hole 15 after moving downward. A right sealing plate 43 with an opening to the left and an arc shape is installed between the outer side of the right portion of the liquid storage cylinder 2 and the inner side of the outer cylinder 1. A second liquid passage hole 48 is provided on the outer side of the right sealing plate 43, which can connect the second inner liquid outlet hole 16 and the second outer liquid outlet hole 17 after moving downward.

[0107] The first liquid inlet channel 10 corresponding to the position between the lower switch plate 20 and the first liquid pipe 12 has a first switch chamber 49, and a first communicating vessel is provided in the first switch chamber 49. The first communicating vessel includes a first base 51, a first sleeve 52, a first elastic reset member 53 and a first communicating core 54. The first base 51 is fixedly installed on the inner side of the lower part of the first switch chamber 49, and the first sleeve 52 is sleeved on the outer side of the upper part of the first base 51. A first elastic reset member 53 is provided between the lower end of the first sleeve 52 and the outer side of the first base 51. The upper end of the first base 51 is provided with a first connecting channel 55 that runs through from top to bottom. A sealing sliding member is installed in the first connecting channel 55. The first connecting core 54, corresponding to the position above the first base 51, is fixed with a first limiting outer ring platform 56 on the outer side of the upper end of the first connecting core 54, and the outer side of the first limiting outer ring platform 56 is detachably fixed to the inner side of the first sleeve 52. The upper end of the first connecting core 54 is provided with a first section flow hole 57 whose lower end extends to the outer side of the lower part of the first connecting core 54. The rear outer side of the liquid inlet column 9 is provided with a first sliding hole 58 in a strip shape that is connected to the first switch chamber 49. The first fixing rod 44 with its front end fixed to the outer side of the first sleeve 52 is slidably installed in the first sliding hole 58, and the rear end of the first fixing rod 44 is fixed to the upper part of the right sealing plate 43.

[0108] A second switch chamber 50 is provided in the second liquid inlet channel 11 corresponding to the position between the lower switch plate 20 and the second liquid pipe 13. A second communicating vessel 46 with the same structure as the first communicating vessel is provided in the second switch chamber 50. A second strip-shaped sliding hole 59 communicating with the second switch chamber 50 is provided on the outer side of the front of the liquid inlet column 9. A second fixing rod 45 is slidably installed in the second sliding hole 59, the rear end of which is fixedly installed at the corresponding position of the second communicating vessel 46. The front end of the second fixing rod 45 is fixedly installed to the upper part of the left sealing plate 42.

[0109] When the medium flows into the first liquid passage 12, the first sleeve 52 moves downward, so that the second inner liquid outlet 16 and the second outer liquid outlet 17 are connected to each other through the first fixing rod 44 and the right sealing plate 43. At the same time, no medium flows into the second liquid passage 13, and the second communicating vessel 46 disconnects the first inner liquid outlet 14 and the first outer liquid outlet 15 from each other through the second fixing rod 45 and the left sealing plate 42.

[0110] When the medium flows into the second liquid passage 13, the second communicating device 46 connects the first inner liquid outlet 14 with the first outer liquid outlet 15 through the second fixing rod 45 and the left sealing plate 42. At the same time, no medium flows into the first liquid passage 12. After the first sleeve 52 moves upward, it connects the second inner liquid outlet 16 with the second outer liquid outlet 17 through the first fixing rod 44 and the right sealing plate 43.

[0111] According to the requirements, the outer contour of the first connecting core 54 matches the cross-section of the first connecting channel 55, and both are circular or rectangular with chamfered structures at all four corners. The length of the first connecting core 54 is greater than the length of the first connecting channel 55. The outer side of the first limiting outer ring platform 56 and the inner side of the first sleeve 52 are detachably sealed and fixed together by threaded connection. The diameter of the first switch chamber 49 is greater than the diameter of the first liquid inlet channel 10. The first base 51 is T-shaped with a narrow upper part and a wide lower part. In order to facilitate the disassembly and assembly of the first communicating vessel, the lower diameter of the first switch chamber 49 is the same as the lower diameter of the first liquid inlet channel 10, and the sealing thread on the lower inner side of the first liquid inlet channel 10 is It is connected to a disassembly sleeve, and the upper end of the first liquid tube 12 is sealed and fixedly installed in the disassembly sleeve. The first elastic reset member 53 is an existing well-known compression spring. The diameter of the second switch chamber 50 is larger than the diameter of the second liquid inlet channel 11. The inner arc surfaces of the left sealing plate 42 and the right sealing plate 43 both match the outer wall of the liquid storage cylinder 2, and the outer arc surfaces of the left sealing plate 42 and the right sealing plate 43 both match the inner wall of the outer cylinder 1. The minimum vertical distance between the upper and lower ends of the first connecting channel 55 is greater than the length of the first sliding hole 58. In this way, after the lower end of the first connecting channel 55 moves to the bottom of the first base 51, it can ensure that the first fixing rod 44 moves to the lower end of the first sliding hole 58.

[0112] When the pressurized medium flows into the first liquid passage 12, the pressurized medium flows into the upper end of the first sleeve 52 and then into the first communicating core 54. Since the inner diameter of the first sleeve 52 is larger than the inner diameter of the first communicating core 54, there is a pressure difference at both ends of the first limiting outer ring platform 56. The pressurized medium acts on the upper end of the first limiting outer ring platform 56, causing the upper end of the first limiting outer ring platform 56 to move downward, thereby driving the first sleeve 52 to move downward and compressing the first elastic reset member 53. After the first limiting outer ring platform 56 moves downward and contacts with the upper end of the first base 51, the upper end of the first sleeve 52 moves downward and is located above the first sliding hole 58. The first fixing rod 44 moves downward along the first sliding hole 58. When a fixing rod 44 moves downward, it drives the right sealing plate 43 to move downward, and makes the second inner liquid outlet 16, the second liquid passage hole 48 and the second outer liquid outlet 17 connected one by one. Since the second liquid inlet channel 11 is closed by the upper switch plate 19 and the lower switch plate 20 at this time, no medium flows into the second switch chamber 50, the second communicating vessel 46 does not move and is in the initial state, the position of the first sleeve of the second communicating vessel 46 remains unchanged, the second fixing rod 45 is located at the upper position of the second sliding hole 59, and the initial position of the left sealing plate 42 makes the first inner liquid outlet 14, the first liquid passage hole 47 and the first outer liquid outlet 15 not connected to each other, so that the first inner liquid outlet 14 is blocked by the left sealing plate 42.

[0113] In the liquid storage state, pressurized medium is injected into the upper end of the liquid inlet pipe 18, and the pressurized medium flows into the first liquid storage chamber 4 below the first lower piston 7 through the first liquid pipe 12. As the pressurized medium continues to flow in, the pressurized medium pushes the first lower piston 7 to move upward, and at the same time, the pressurized medium flows along the first communicating hole 6 into the second liquid storage chamber 5 above the second lower piston 8. At this time, the second inner liquid outlet hole 16, the second liquid hole 48 and the second outer liquid hole 17 are connected one by one. In this way, when the dual-chamber fracturing device is lowered into the horizontal well and the second lower piston 8 moves to When the first lower piston 7 moves upward and contacts the lower end of the first upper piston 33, under the action of the pressurized medium, the first lower piston 7 and the first upper piston 33 continue to move upward, the left elastic return member 39 is compressed, the first switch rod 34 moves upward, and the first switch The upper end of the closing rod 34 first passes through the lower left through hole 37, causing the lower switch plate 20 to move to the left before the upper switch plate 19. The lower hook 30 is clamped in the lower groove 32. The upper end of the first switch rod 34 then passes through the upper left through hole 38 and pushes up the upper hook 27, causing the upper hook 27 and the upper groove 29 to separate from each other. The upper switch plate 19 moves to the left under the action of the upper elastic reset member 28. After both the upper switch plate 19 and the lower switch plate 20 move to the left, the first liquid inlet channel 10 is closed and the second liquid inlet channel 11 is opened. At this time, the liquid below the first lower piston 8 is closed. Fracturing fluid is stored in the first liquid storage chamber 4, the first connecting hole 6 and the second liquid storage chamber 5 above the second lower piston 8. That is, the volume of the medium flowing into the first liquid pipe 12 reaches the first set value, and the injection of pressurized medium is stopped. After the first liquid inlet channel 10 is closed, the first sleeve 52 moves upward together with the first connecting core 54 and the first fixing rod 44 under the action of the first elastic return member 53, thereby driving the right sealing plate 43 to move upward to the initial position, so that the second inner liquid outlet hole 16, the second liquid passage hole 48 and the second outer liquid outlet hole 17 are not connected to each other.

[0114] In the fracturing state, the dual-chamber fracturing device is lowered into the target position in the well, and the first outgoing liquid hole 15 corresponds to the target fracturing position. At this time, the pressurized medium is injected, and the pressurized medium enters the second switch chamber 50 to make the second communicating vessel 46 actuated (the action principle and process are the same as those of the first communicating vessel), and the second fixed rod 45 moves downward along the second sliding hole 59. The second fixed rod 45 moves downward with the left sealing plate 42, and finally makes the first inner liquid outlet 14, the first liquid hole 47, and the first outgoing liquid hole 15 connected one by one. In this way, in the liquid storage state, the first liquid storage chamber 4, the first communicating hole 6 and the second lower piston 8 below the first lower piston 8 are connected. 8 above the second liquid storage chamber 5 is discharged through the first inner liquid outlet hole 14, the first liquid hole 47, and the first outgoing liquid hole 15. At the same time, the pressurized medium flows into the second liquid storage chamber 5 below the second lower piston 8 through the second liquid pipe 13. When the second lower piston 8 moves upward, the pressurized medium above the second lower piston 8 can be discharged into the first liquid storage chamber 4 below the first lower piston 7 through the first communicating hole 6. The pressurized medium can also flow into the first liquid storage chamber 4 above the first lower piston 7 through the second communicating hole 78. At the same time, the first upper piston 33 also moves downward under the reset action of the left elastic reset member 39. The first upper piston 3 3 and the first lower piston 7 move downward, so that the pressurized medium is discharged quickly, and finally the fracturing fluid stored in the second liquid storage chamber 5 above the second lower piston 8, the first communicating hole 6 and the first liquid storage chamber 4 below the first lower piston 7 is discharged, thereby realizing the fracturing operation. Since the second inner liquid outlet hole 16 and the second inner liquid storage hole 17 are not connected to each other at this time, the pressurized medium is stored in the second liquid storage chamber 5 below the second lower piston 8, the second communicating hole 78 and the first liquid storage chamber 4 above the first lower piston 7. When the first upper piston 33 moves to the initial position, the first limiting ring 66 contacts the upper end of the liquid storage cylinder 2, and the first switch rod 34 contacts with each other. The upper switch plate 19 and the lower switch plate 20 are separated from each other, and the second lower piston 8 and the second upper piston 35 move upward. The second switch rod 36 moves upward and then inserts into the lower right through hole 41, and then the lower hook 30 is lifted so that the lower hook 30 and the lower slot 32 are separated from each other. The lower switch plate 20 moves to the right under the action of the lower elastic reset member 31, and the lower switch plate 20 drives the upper switch plate 19 to move to the left through the connecting rod 26 until the lower switch plate 20 and the upper switch plate 19 move to the initial position. The volume of the medium flowing into the second liquid pipe 13 reaches the second set value, the second liquid inlet channel 11 is closed, and the first liquid inlet channel 10 is opened at the same time.

[0115] When the liquid is in the storage state again, the pressurized medium is injected into the upper end of the liquid inlet pipe 18, and the pressurized medium flows into the first liquid storage chamber 4 below the first lower piston 7 through the first liquid pipe 12. As the pressurized medium continues to flow in, the pressurized medium pushes the first lower piston 7 to move upward, and at the same time, the pressurized medium flows along the first communicating hole 6 into the second liquid storage chamber 5 above the second lower piston 8. At this time, the second inner liquid outlet hole 16, the second liquid hole 48 and the second liquid outlet hole 17 are connected one by one. In this way, the liquid stored in the second liquid storage chamber 5 below the second lower piston 8 and the second communicating hole 7 is in the fracturing state. 8 and the pressurized medium in the first liquid storage chamber 4 above the first lower piston 7 are discharged through the second inner liquid outlet 16, the second liquid hole 48 and the second outgoing liquid hole 17. The pressurized medium flowing into the second liquid storage chamber 5 above the second lower piston 8 and the right elastic return member 40 act together to make the second upper piston 35 and the second lower piston 8 move downward, which can ensure the flow rate and pressure of the pressurized medium flowing out of the second outgoing liquid hole 17, thereby ensuring the fracturing effect. After the second switch rod 36 moves downward and separates from the lower switch plate 20, the first lower piston 7 moves upward and The lower ends of the first upper piston 33 contact each other. Under the action of the pressurized medium, the first lower piston 7 and the first upper piston 33 continue to move upward, the left elastic return member 39 is compressed, and the first switch rod 34 moves upward. The upper end of the first switch rod 34 first passes through the lower left through hole 37, so that the lower switch plate 20 moves to the left before the upper switch plate 19. The lower hook 30 is clamped in the lower groove 32. The upper end of the first switch rod 34 then passes through the upper left through hole 38 and lifts the upper hook 27 so that the upper hook 27 and the upper groove 29 are separated from each other. The upper switch plate 19 is closed under the action of the upper elastic return member 28. Move to the left, after both the upper switch plate 19 and the lower switch plate 20 move to the left, the first liquid inlet channel 10 is closed and the second liquid inlet channel 11 is opened. At this time, the volume of the medium flowing into the first liquid pipe 12 reaches the first set value, and the injection of pressurized medium is stopped. After the first liquid inlet channel 10 is closed, the first sleeve 52 moves upward together with the first connecting core 54 and the first fixing rod 44 under the action of the first elastic return member 53, thereby driving the right sealing plate 43 to move upward to the initial position, so that the second inner liquid outlet 16, the second liquid hole 48 and the second outer liquid hole 17 are not connected to each other.

[0116] In this way, the dual-chamber fracturing device can realize fracturing operations at multiple target locations underground. During the fracturing process, it can also store media at the same time, thereby improving the utilization rate of the dual-chamber fracturing device.

[0117] Example 7: As an optimization of the above embodiment, as shown in the attached Figures 1 to 4As shown in Figures 11, the upper left side of the upper through hole 38 has a first inclined surface 60, and the upper part of the first inclined surface 60 is inclined to the left relative to the lower part. The lower left side of the lower through hole 37 has a second inclined surface 61, and the lower part of the second inclined surface 61 is inclined to the left relative to the upper part. The upper inner wall of the lower right through hole 41 has a third inclined surface 62, and the upper part of the third inclined surface 62 is inclined to the right relative to the lower part.

[0118] The setting of the first inclined surface 60, when the upper switch plate 19 moves to the left, the left part of the upper hook 27 can be smoothly stuck in the upper left through hole 38, and when the upper switch plate 19 moves to the right, the left part of the upper hook 27 can also be smoothly separated from the upper left through hole 38. When the upper end of the first switch rod 34 moves to the upper left through hole 38 to push up the upper hook 27, it can also prevent the left part of the upper hook 27 from interfering with the inner wall of the upper left through hole 38. Similarly, when the third inclined surface 62 is set, when the lower switch plate 20 moves to the right, the right part of the lower hook 30 can be smoothly stuck in the lower right through hole 41. When the lower switch plate 20 moves to the left, the right part of the lower hook 30 can also be smoothly separated from the lower right through hole 41. When the upper end of the second switch rod 36 moves to the lower right through hole 41 to push up the lower hook 30, it can also prevent the lower hook 30 from interfering with each other. The right part interferes with the inner wall of the lower right through-hole 41. The second inclined surface 61 is set. Since the first switch rod 34 moves vertically up and down, when the upper end of the first switch rod 34 moves upward, it continues to move upward along the second inclined surface 61. Since the right part of the lower hook 30 is located in the lower right through-hole 41 at this time, the first switch rod 34 acts on the second inclined surface 61 to cause the lower switch plate 20 to move to the left. When the first switch rod 34 passes through the lower left through-hole 37, the first lower switch hole 23 of the lower switch plate 20 moves to the left and is still connected to the first liquid inlet channel 10, and the medium continues to flow downward. After the second lower switch hole 24 of the lower switch plate 20 moves to the left, it corresponds to the second liquid inlet channel 11. The right part of the lower hook 30 is clamped in the lower card slot 32, and the upper card slot 29 and the lower card slot 32 are both through-connected from front to back.

[0119] Example 8: As an optimization of the above embodiment, as shown in the attached Figures 1 to 4 As shown in 11 to 16, an upper hinge ear 68 is fixedly installed on the left side of the liquid inlet column 9 corresponding to the position above the upper switch plate 19, and an upper hinge pin 69 is rotatably installed in the upper hinge ear 68. The upper hinge pin 69 is hingedly installed with the right part of the upper hook 27, and a first torsion spring 70 is sleeved on the outer side of the upper hinge pin 69, which can make the lower side of the left part of the upper hook 27 abut against the upper side of the upper switch plate 19. A lower hinge ear 71 is fixedly installed on the right side of the liquid inlet column 9 corresponding to the position above the lower switch plate 20, and a lower hinge pin 72 is rotatably installed in the lower hinge ear 71. The lower hinge pin 72 is hingedly installed with the left part of the lower hook 30, and a second torsion spring 73 is sleeved on the outer side of the lower hinge pin 72, which can make the lower side of the right part of the lower hook 30 abut against the upper side of the lower switch plate 20.

[0120] The cam 72 is pressed against the left end of the lever 20 and the lever 20 is engaged, and the cam 72 is pressed against the left end of the lever 20 to release the lever 20. When the lever 20 is engaged, the lever 20 is engaged, and the second end of the lever 20 is engaged, and the lever 20 is engaged, so that the lever 20 is engaged.

[0121] Example 9: As an optimization of the above embodiment, as shown in the attached Figure 13 As shown, the left side of the upper end of the first switch rod 34 has a fourth inclined surface 63 matching the second inclined surface 61, and the left side of the upper end of the first switch rod 34 corresponding to the position of the upper hook 27 is provided with an upper limit groove 64 opening upward and passing through left and right. The first switch rod 34 is fixedly installed on the outer side of the lower part with a first limit ring 66 in contact with the upper end of the liquid storage cylinder 2, and the left side of the upper end of the second switch rod 36 corresponding to the position of the lower hook 30 is provided with a lower limit groove 65 opening upward and passing through left and right. The second switch rod 36 is fixedly installed on the outer side of the lower part with a second limit ring 67 in contact with the upper end of the liquid storage cylinder 2.

[0122] According to the requirements, the width of the upper limit groove 64 matches the thickness of the left part of the upper hook 27, so that after the first switch rod 34 moves up, the left part of the upper hook 27 can be located in the upper limit groove 64, which can prevent the upper hook 27 and the first switch rod 34 from being misaligned with each other under the action of the first torsion spring 70 when the upper hook 27 is lifted by the first switch rod 34, resulting in the failure of the upper hook 27 to separate from the upper groove 29. Similarly, the width of the lower limit groove 65 matches the thickness of the right part of the lower hook 30, so that after the second switch rod 36 moves up, the lower hook 30 can be located in the lower limit groove 65, which can prevent When the lower stop hook 30 is lifted up by the second switch rod 36, under the action of the second torsion spring 73, the lower hook 30 and the second switch rod 36 are misaligned with each other, resulting in the failure of the lower hook 30 to separate from the lower slot 32. After the first switch rod 34 moves upward, it can smoothly lift the upper hook 27. In this way, after the upper switch plate 19 loses its limiting effect, it moves to the left under the action of the upper elastic return member 28. After the first upper switch hole 21 of the upper switch plate 19 moves to the left, it is misaligned with the first liquid inlet channel 10. After the second upper switch hole 22 of the upper switch plate 19 moves to the left, it is connected to the second liquid inlet channel 11 correspondingly.

[0123] Similarly, after the second switch rod 36 moves upward, it can smoothly lift the lower hook 30. In this way, after the lower switch plate 20 loses its limiting effect, it moves to the right under the action of the lower elastic return member 31. After the first lower switch hole 23 of the lower switch plate 20 moves to the right, it is still connected to the first liquid inlet channel 10. After the second lower switch hole 24 of the lower switch plate 20 moves to the right, it is misaligned with the second liquid inlet channel 11. After the lower switch plate 20 moves to the right, it drives the upper switch plate 19 to move to the right. In this way, the second liquid inlet channel 11 is closed by the upper switch plate 19 and the lower switch plate 20, and the medium no longer flows into the second liquid pipe 12. At the same time, the first liquid inlet channel 10 is opened by the upper switch plate 19 and the lower switch plate 20.

[0124] The setting of the first limiting ring 66 and the second limiting ring 67 can prevent the first switch rod 34 and the second switch rod 36 from moving rapidly downward into the liquid storage cylinder 2 after the left elastic return member 39 and the right elastic return member 40 are reset, causing a malfunction. The first switch rod 34 and the second switch rod 36 can both be a rod-shaped structure with a thick upper part and a thin lower part. The cross-section of the upper part of the first switch rod 34 and the upper part of the second switch rod 36 can be rectangular, and the cross-section of the lower part of the first switch rod 34 and the lower part of the second switch rod 36 can be circular.

[0125] The first switch rod 34 has a fourth inclined surface 63 on the left side of the upper end thereof that matches the second inclined surface 61. The fourth inclined surface 63 is configured so that, during the ascending process of the first switch rod 34, the fourth inclined surface 63 and the second inclined surface 61 come into contact with each other and slowly squeeze the second inclined surface 61, thereby causing the lower switch plate 20 to slowly move leftward and then squeeze the lower elastic return member 31. When the upper portion of the first switch rod 34 is completely moved into the lower left through hole 37, the first lower switch hole 23 of the lower switch plate 20 remains connected to the first liquid inlet channel 10 after moving leftward, and the medium continues to flow downward. When the second lower switch hole 24 of the lower switch plate 20 moves leftward, the first liquid inlet channel 10 is closed and the second liquid inlet channel 11 is opened.

[0126] The upper end of the second switch rod 36 can be a flat surface or a V-shaped wedge surface with an opening downward. After the second switch rod 36 rises and passes through the lower right through hole 41, it can push up the lower hook 30. The lower switch plate 20 moves rightward to the initial position under the action of the lower elastic return member 31. That is, the first lower switch hole 23 of the lower switch plate 20 corresponds to the first liquid inlet channel 10. When the second lower switch hole 24 of the lower switch plate 20 moves rightward, the first liquid inlet channel 10 is opened and the second liquid inlet channel 11 is closed.

[0127] Example 10: As an optimization of the above embodiment, as shown in the attached Figure 1 、 8As shown in 17 to 20, a left limiting column 74 is fixed to the inner side of the lower portion of the outer cylinder 1 corresponding to the left position of the partition plate 3, and a left fixing hole which runs through the lower end of the liquid storage cylinder 2 corresponding to the position of the left limiting column 74 is provided, and a left limiting cylinder 75 which is sleeved on the outer side of the left limiting column 74 is sealed and fixed in the left fixing hole, and the upper end of the left limiting cylinder 75 is in contact with the lower end of the first lower piston 7, and a right limiting column 76 is fixed to the inner side of the lower portion of the outer cylinder 1 corresponding to the right position of the partition plate 3, and a right fixing hole which runs through the lower end of the liquid storage cylinder 2 corresponding to the position of the right limiting column 76 is provided, and a right limiting cylinder 77 which is sleeved on the outer side of the right limiting column 76 is sealed and fixed in the right fixing hole, and the upper end of the right limiting cylinder 77 is in contact with the lower end of the second lower piston 8.

[0128] According to the requirements, the left limit column 74, the right limit column 76 and the outer tube 1 are integrally arranged, and the left limit tube 75 and the right limit tube 77 are integrally arranged with the liquid storage tube 2. Through such an arrangement, it can not only play a limiting effect on the first lower piston 7 and the second lower piston 8, but also make the first lower piston 7 located above the first inner liquid outlet 14, and the second lower piston 8 located above the second inner liquid outlet 16. At the same time, the first lower piston 7 is located above the lower end of the first connecting hole 6. In this way, after the medium flows into the first connecting hole 6, the first lower piston 7 can move upward to achieve the storage effect of the medium. At the same time, the limit tube can also make the force on the first lower piston 7 and the second lower piston 8 more uniform after the medium flows into the lower part, and the first lower piston 7 and the second lower piston 8 can move up and down smoothly.

[0129] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and optimal implementation effects. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A dual-chamber fracturing device, characterized in that and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in said pump end and a check valve in said pump end, and said former tube which connects the pump to the oil drain plug, said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug, said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug. A switching switch is provided on the upper part of the liquid inlet column. When the switching switch is actuated, the liquid inlet hole can be connected to the first liquid pipe or the second liquid pipe. A first inner liquid outlet hole is provided on the outer side of the left part of the liquid storage cylinder, which is connected to the inside and outside. A first outer liquid outlet hole is provided on the outer side of the left part of the outer cylinder, which corresponds to the first inner liquid outlet hole. A second inner liquid outlet hole is provided on the outer side of the right part of the liquid storage cylinder, which corresponds to the second inner liquid outlet hole. A linkage component is provided in the liquid storage cylinder, and when the volume of the medium flowing into the first liquid tube reaches a first set value, the linkage component can cause the switching switch to operate so that the liquid inlet is connected to the second liquid tube, the first inner liquid outlet is not connected to the first outer liquid outlet, and the second inner liquid outlet is connected to the second outer liquid outlet; when the volume of the medium flowing into the second liquid tube reaches a second set value, the linkage component can cause the switching switch to operate again so that the liquid inlet is connected to the first liquid tube, the first inner liquid outlet is connected to the first outer liquid outlet, and the second inner liquid outlet is not connected to the second outer liquid outlet.

2. The dual-chamber fracturing device according to claim 1, characterized in that A liquid inlet pipe is fixedly installed on the upper end of the outer cylinder, and the lower end of the liquid inlet pipe is respectively connected with the upper end of the first liquid inlet channel and the upper end of the second liquid inlet channel. The upper end of the liquid inlet pipe is sealed and passed through the liquid inlet hole and is located above the outer cylinder. A second communicating hole is provided in the partition plate. The lower end of the second communicating hole is connected with the second liquid storage chamber below the second lower piston, and the upper end of the second communicating hole is connected with the upper part of the first liquid storage chamber.

3. The dual-chamber fracturing device according to claim 2, characterized in that The switching switch includes an upper switch plate and a lower switch plate, and the upper mounting holes and lower mounting holes are distributed at intervals above and below the liquid inlet column corresponding to the position between the liquid inlet pipe and the first liquid-passing pipe, and the middle of the upper mounting hole and the middle of the lower mounting hole are respectively connected to the first liquid inlet channel and the second liquid inlet channel. The upper switch plate is slidably mounted in the upper mounting hole, and the first upper switch hole corresponding to the first liquid inlet channel is provided on the upper left side of the upper switch plate, and the second upper switch hole is provided on the right side of the upper switch plate corresponding to the right position of the second liquid inlet channel. The lower switch plate is slidably mounted in the lower mounting hole, and the first lower switch hole corresponding to the first liquid inlet channel is provided on the upper left side of the lower switch plate, and the second lower switch hole is provided on the right side of the lower switch plate corresponding to the right position of the second liquid inlet channel. A sliding groove is provided on the lower right side of the upper switch plate, and a connecting rod with an upper end slidably mounted in the sliding groove is fixedly mounted on the upper side of the lower switch plate; When the volume of the medium flowing into the first liquid pipe reaches a first set value, the linkage assembly can cause the upper switch plate and the lower switch plate to move leftward so that the liquid inlet hole is connected to the second liquid pipe, and the first inner liquid outlet hole and the first outer liquid outlet hole are disconnected from each other; When the volume of the medium flowing into the second liquid pipe reaches a second set value, the linkage assembly can cause the upper switch plate and the lower switch plate to move to the right so that the liquid inlet hole is connected to the first liquid pipe, the first inner liquid outlet hole is connected to the first outer liquid hole, and the second inner liquid outlet hole is not connected to the second outer liquid hole.

4. The dual-chamber fracturing device according to claim 3, characterized in that The switching structure also includes an upper positioning mechanism and a lower positioning mechanism. The upper positioning mechanism includes an upper hook and an upper elastic reset member. An upper slot is provided on the upper left side of the upper switch plate corresponding to the left position of the liquid inlet column. An upper hook is hingedly installed on the left side of the upper part of the liquid inlet column. The lower part of the upper hook is clamped in the upper slot. An upper elastic reset member is provided between the right side of the upper switch plate and the inner side of the right part of the outer cylinder. The lower positioning mechanism includes a lower hook and a lower elastic reset member. A lower slot is provided on the upper right side of the lower switch plate corresponding to the right position of the liquid inlet column. A lower hook is hingedly installed on the right side of the upper part of the liquid inlet column. The lower part of the lower hook can be clamped into the lower slot after the lower switch plate moves to the left. A lower elastic reset member is provided between the left side of the lower switch plate and the inner side of the left part of the outer cylinder. When the volume of the medium flowing into the first liquid pipe reaches a first set value, the linkage assembly: the upper hook and the upper slot are separated from each other, the upper elastic reset member is reset, the upper switch plate and the lower switch plate move to the left to connect the liquid inlet with the second liquid pipe, the lower hook is locked in the lower slot, the first inner liquid outlet is disconnected from the first outer liquid outlet, and the second inner liquid outlet is connected to the second outer liquid outlet; When the volume of the medium flowing into the second liquid pipe reaches the second set value, the linkage assembly: the lower hook and the lower slot are separated from each other, the lower elastic reset member is reset, the upper switch plate and the lower switch plate move to the right to connect the liquid inlet hole with the first liquid pipe, the upper hook is installed in the upper slot, the first inner liquid outlet hole is connected to the first outer liquid hole, and the second inner liquid outlet hole is disconnected from the second outer liquid hole.

5. The dual-chamber fracturing device according to claim 4, characterized in that The linkage assembly includes a switch opening and closing mechanism and a liquid outlet opening and closing mechanism, the switch opening and closing mechanism includes a first upper piston, a first switch rod, a second upper piston and a second switch rod, the first upper piston is slidably installed in the first liquid storage chamber corresponding to the position above the first lower piston, the first upper piston is sleeved on the outside of the first liquid tube, the upper end of the first upper piston is fixedly installed with the first switch rod corresponding to the upper end of the upper hook, the upper end of the first switch rod is sealed through the upper end of the left part of the liquid storage cylinder, the lower left side of the lower switch plate corresponding to the position of the first switch rod is provided with a left lower through hole that passes through from top to bottom, the lower left side of the upper switch plate corresponding to the position of the lower through hole is provided with a left upper through hole that passes through from top to bottom, and a left elastic reset member is provided between the upper end of the first upper piston and the inner side of the upper part of the first liquid storage chamber; A second upper piston is slidably mounted in the second liquid storage chamber corresponding to the position above the second lower piston. The second upper piston is sleeved on the outside of the second liquid passage tube. A second switch rod corresponding to the lower hook is fixedly mounted on the upper end of the second upper piston. The upper end of the second switch rod seals and passes through the upper end of the right portion of the liquid storage cylinder. A right lower through hole is provided on the lower right side of the lower switch plate corresponding to the position of the second switch rod. A right elastic reset member is provided between the upper end of the second upper piston and the inner side of the upper portion of the second liquid storage chamber. During the process in which the volume of the medium flowing into the first liquid pipe reaches the first set value: the first lower piston moves upward and drives the first upper piston to move upward together, the upper end of the first switch rod first passes through the lower left through hole to make the lower switch plate move to the left, the lower hook is locked in the lower clamping groove, the upper end of the first switch rod then passes through the upper left through hole and pushes up the upper hook to separate the upper hook and the upper clamping groove, the upper elastic reset member resets, the upper switch plate moves to the left, the upper switch plate and the lower switch plate move to the left to connect the liquid inlet with the second liquid pipe, and the liquid outlet opening and closing mechanism makes the first inner liquid outlet and the first outer liquid outlet disconnected, and the second inner liquid outlet and the second outer liquid outlet connect with each other; During the process in which the volume of the medium flowing into the second liquid pipe reaches the second set value: the second lower piston moves upward and then moves upward together with the second upper piston, the upper end of the second switch rod passes through the lower right through hole and pushes up the lower hook so that the lower hook and the lower slot are separated from each other, after the left elastic reset member is reset, the first switch rod moves downward and separates from the lower switch plate, the lower elastic reset member is reset, the lower switch plate and the upper switch plate move to the right so that the liquid inlet hole is connected to the first liquid pipe, and the liquid outlet opening and closing mechanism makes the first inner liquid outlet hole and the first outer liquid outlet hole connected to each other, and the second inner liquid outlet hole and the second outer liquid hole are disconnected from each other.

6. The dual-chamber fracturing device according to claim 5, characterized in that The liquid outlet opening and closing mechanism includes a left sealing plate, a right sealing plate, a first communicating vessel, a second communicating vessel, a first fixing rod and a second fixing rod. A left sealing plate with an arc-shaped opening facing right is installed between the outer side of the left portion of the liquid storage cylinder and the inner side of the outer cylinder. A first liquid passage hole is provided on the outer side of the left sealing plate, which can be connected to the first inner liquid outlet hole and the first outer liquid outlet hole after moving downward. A right sealing plate with an arc-shaped opening facing left is installed between the outer side of the right portion of the liquid storage cylinder and the inner side of the outer cylinder. A second liquid passage hole is provided on the outer side of the right sealing plate, which can be connected to the second inner liquid outlet hole and the second outer liquid outlet hole after moving downward. The cam is secured to the upper edge of the first support frame, and the cam is secured to the lower edge of the first support frame by an outer thread of the second threaded cannula. A second switch chamber is provided in the second liquid inlet channel corresponding to the position between the lower switch plate and the second liquid passage pipe. A second communicating vessel with the same structure as the first communicating vessel is provided in the second switch chamber. A second strip-shaped sliding hole communicating with the second switch chamber is provided on the outer side of the front of the liquid inlet column. A second fixing rod with a rear end fixedly installed at a corresponding position of the second communicating vessel is slidably installed in the second sliding hole. The front end of the second fixing rod is fixedly installed at the upper portion of the left sealing plate. When the medium flows into the first liquid passage, the first sleeve moves downward and connects the second inner liquid outlet with the second outer liquid outlet through the first fixing rod and the right sealing plate. At the same time, when the medium does not flow into the second liquid passage, the second communicating vessel disconnects the first inner liquid outlet from the first outer liquid outlet through the second fixing rod and the left sealing plate. When the medium flows into the second liquid pipe, the second communicating device communicates with the first inner liquid outlet and the first outer liquid outlet through the second fixed rod and the left sealing plate. At the same time, the medium does not flow into the first liquid pipe. After the first sleeve moves upward, it passes through the first fixed rod and the right sealing plate so that the second inner liquid outlet and the second outer liquid outlet are not connected to each other.

7. The dual-chamber fracturing device according to claim 5 or 6, characterized in that The upper left side of the upper part of the upper left through hole has a first inclined surface, and the upper part of the first inclined surface is inclined to the left relative to the lower part. The lower left side of the lower part of the lower left through hole has a second inclined surface, and the lower part of the second inclined surface is inclined to the left relative to the upper part. The inner wall of the upper part of the lower right through hole has a third inclined surface, and the upper part of the third inclined surface is inclined to the right relative to the lower part.

8. The dual-chamber fracturing device according to claim 7, characterized in that The left side of the upper end of the first switch rod has a fourth inclined surface matching the second inclined surface, and the left side of the upper end of the first switch rod corresponding to the upper hook position is provided with an upper limit groove opening upward and passing through left and right. The outer side of the lower part of the first switch rod is fixedly installed with a first limit ring in contact with the upper end of the liquid reservoir. The left side of the upper end of the second switch rod corresponding to the lower hook position is provided with a lower limit groove opening upward and passing through left and right. The outer side of the lower part of the second switch rod is fixedly installed with a second limit ring in contact with the upper end of the liquid reservoir. Or / and, an upper hinge ear is fixedly installed on the left side of the liquid inlet column corresponding to the position above the upper switch plate, an upper hinge pin is rotatably installed in the upper hinge ear, the upper hinge pin is hingedly installed with the right part of the upper hook, and a first torsion spring is sleeved on the outer side of the upper hinge pin, which can make the lower side of the left part of the upper hook resist against the upper side of the upper switch plate; a lower hinge ear is fixedly installed on the right side of the liquid inlet column corresponding to the position above the lower switch plate, a lower hinge pin is rotatably installed in the lower hinge ear, the lower hinge pin is hingedly installed with the left part of the lower hook, and a second torsion spring is sleeved on the outer side of the lower hinge pin, which can make the lower side of the right part of the lower hook resist against the upper side of the lower switch plate.

9. The dual-chamber fracturing device according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8, characterized in that A left limiting column is fixed on the inner side of the lower part of the outer cylinder corresponding to the left position of the partition plate, and a left fixing hole which runs through the lower end of the liquid storage cylinder corresponding to the position of the left limiting column is provided. The left limiting cylinder which is sleeved on the outer side of the left limiting column is sealed and fixed in the left fixing hole, and the upper end of the left limiting cylinder contacts the lower end of the first lower piston. A right limiting column is fixed on the inner side of the lower part of the outer cylinder corresponding to the right position of the partition plate, and a right fixing hole which runs through the lower end of the liquid storage cylinder corresponding to the position of the right limiting column is provided. The right limiting cylinder which is sleeved on the outer side of the right limiting column is sealed and fixed in the right fixing hole, and the upper end of the right limiting cylinder contacts the lower end of the second lower piston.

10. The dual-chamber fracturing device according to claim 7, characterized in that A left limiting column is fixed on the inner side of the lower part of the outer cylinder corresponding to the left position of the partition plate, and a left fixing hole which runs through the lower end of the liquid storage cylinder corresponding to the position of the left limiting column is provided. The left limiting cylinder which is sleeved on the outer side of the left limiting column is sealed and fixed in the left fixing hole, and the upper end of the left limiting cylinder contacts the lower end of the first lower piston. A right limiting column is fixed on the inner side of the lower part of the outer cylinder corresponding to the right position of the partition plate, and a right fixing hole which runs through the lower end of the liquid storage cylinder corresponding to the position of the right limiting column is provided. The right limiting cylinder which is sleeved on the outer side of the right limiting column is sealed and fixed in the right fixing hole, and the upper end of the right limiting cylinder contacts the lower end of the second lower piston.

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