Energy-focused fracturing tools

Abstract

The present invention relates to the technical field of unconventional oil and gas well fracturing tools, and is an energy-gathering fracturing tool, comprising an outer tube, a charging tube, a gas storage tank, a telescopic sealing assembly and a switching assembly, wherein a charging tube is fixedly installed on the inner side of the upper end of the outer tube, and a gas storage tank is installed in the outer tube corresponding to the position below the charging tube, and a closed air inlet cavity and a closed air storage cavity are provided in the gas storage tank at upper and lower intervals. The energy-gathering fracturing tool of the present invention can realize repeated charging and fracturing, and it is no longer necessary to lift it to the wellhead for charging, and the charging of supercritical carbon dioxide can be completed underground, saving operation time and improving efficiency. The energy-gathering fracturing tool of the present invention is equipped with a telescopic sealing assembly, which has a spatial isolation function, and it is no longer necessary to lower a packer, so that the integration of isolation and fracturing is realized. The energy-gathering fracturing tool of the present invention has an ingenious structure, and the gas storage cavity can be expanded through transformation. Even if the well site conditions cannot charge underground, multiple fracturing can be realized by charging once, reducing the number of lifting times and effectively reducing costs.

Description

Technical Field

[0001] The invention relates to the technical field of unconventional oil and gas well fracturing tools, in particular to an energy-focused fracturing tool. Background Art

[0002] Unconventional oil and gas production plays a huge role in economic development. The development of unconventional oil and gas requires reservoir transformation due to low permeability. In order to respond to environmental protection requirements and improve mining efficiency, supercritical carbon dioxide fracturing technology has gradually become an alternative. By utilizing its special physical and chemical properties, it can not only improve the fracturing effect, but also reduce environmental risks.

[0003] Supercritical carbon dioxide refers to the supercritical state when the temperature of carbon dioxide is higher than 31.1°C and the corresponding supercritical pressure is higher than 7.39MPa. Supercritical carbon dioxide has a density close to that of liquid, a viscosity close to that of gas, and extremely strong diffusivity, so it is effective in fracturing construction.

[0004] A Chinese patent document with publication number CN111911125A discloses an energy-focusing fracturing tool, which includes: a shell having a cavity, the shell having an inlet end and an outlet end, and a groove is arranged 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 matches 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.

[0005] A Chinese patent document with publication number CN111911124A discloses a ball-throwing energy-concentrating fracturing tool, which includes: a shell having a cavity, in which a ball seat is arranged; a ball clamp for accommodating multiple balls, the ball clamp having an opening; a fixed seat arranged between the opening and the ball seat, the fixed seat having a first channel; a sliding seat arranged between the first channel and the opening, the sliding seat having a second channel; the sliding seat having a first position allowing the ball to enter the second channel and a second position preventing the ball from entering the second channel; a first elastic member capable of applying force to the sliding seat; when the sliding seat is in the first position, the ball enters the second channel from the opening, and the first elastic member accumulates elastic potential energy; when the sliding seat is in the second position, the first elastic member releases the accumulated elastic potential energy, and the ball falls into the ball seat along the second channel and the first channel in sequence.

[0006] Existing supercritical carbon dioxide energy-concentrating fracturing tools are not recyclable, and most of them are disposable downhole tools, which are costly and wasteful of materials. Even recyclable energy-concentrating fracturing tools have defects such as low operating efficiency and easy loss. Summary of the invention

[0007] The present invention provides a concentrated energy fracturing tool, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of low operating efficiency, high cost and easy loss of supercritical carbon dioxide concentrated energy fracturing tools used in the existing unconventional oil and gas well fracturing process.

[0008] The technical solution of the present invention is achieved through the following measures: a concentrated energy fracturing tool, including an outer tube, a charging tube, an air storage tank, a telescopic sealing assembly and a switching assembly, a charging tube is fixedly installed on the inner side of the upper end of the outer tube, a gas storage tank is installed in the outer tube corresponding to the position below the charging tube, a closed air inlet cavity and a closed air storage cavity are arranged at intervals in the upper and lower parts of the air storage tank, a switch hole is arranged in the middle part of the air storage tank, the upper end of the switch hole is connected with the lower part of the air inlet cavity, the lower end of the switch hole is connected with the upper part of the air storage cavity, a one-way valve capable of opening and closing the switch hole is arranged in the air storage cavity, a telescopic sealing assembly capable of radially contracting is arranged at the upper and lower parts of the outer tube, a switching assembly is arranged between the outer side of the air storage tank and the inner side of the outer tube, an external air inlet channel connected with the lower part of the charging tube is arranged on the upper part of the switching assembly, and a An inner air inlet channel connected to the air inlet chamber, an inner air outlet channel connected to the air storage chamber is provided on the outer side of the lower part of the air storage tank, and an outer air outlet channel connected to the inner and outer parts is provided on the outer side of the lower part of the outer tube. After the pressurized medium is introduced into the charging tube, the switching assembly can make the air storage tank be in a charging state or a discharging state. When the air storage tank is in the charging state, the outer air inlet channel and the inner air inlet channel, the inner air outlet channel and the outer air outlet channel are not connected to each other, the one-way valve is opened, the air inlet chamber and the air storage chamber are connected to each other, and the telescopic sealing assembly can retract inwardly; when the air storage tank is in the discharging state, the outer air inlet channel and the inner air inlet channel are not connected to each other, the one-way valve is closed, the air inlet chamber and the air storage chamber are not connected to each other, the inner air outlet channel and the outer air outlet channel are connected to each other, and the telescopic sealing assembly extends outward and can be in sealing contact with the well wall.

[0009] The following are further optimizations and / or improvements to the above technical solutions:

[0010] The above-mentioned switching assembly may include a knob, a button, a rotating cylinder, a first elastic reset mechanism and a second elastic reset mechanism. A limited inner ring platform is fixed on the inner side of the upper part of the outer cylinder corresponding to the position of the air inlet cavity. A knob with a tubular structure is sleeved between the outer side of the gas storage tank and the inner side of the outer cylinder. A button with an upper end located below the charging tube is sleeved on the outer side of the upper part of the knob. The button is a tubular structure with an open lower end and a closed upper end. The outer air inlet channel includes at least one outer air inlet hole uniformly distributed on the outer side of the upper part of the button along the circumference. The inner air inlet channel includes a one-to-one corresponding to the outer air inlet hole and is provided The inner air inlet hole is placed on the outer side of the upper part of the gas storage tank. A rotating cylinder with a tubular structure is slidably installed along the axial direction on the outer side of the knob corresponding to the lower end position of the limiting inner ring platform. At least two long grooves with lower end openings are evenly distributed along the circumference of the outer side of the lower part of the rotating cylinder. A short groove communicating with the inside and outside is provided at the lower end of the rotating cylinder between each two adjacent long grooves. The upper end of the short groove is located below the upper end of the long groove. A lower ratchet with the tooth tip facing downward is formed between each two adjacent long grooves and short grooves. A positioning block fixedly installed with the outer side of the knob is provided in each long groove. The corresponding positioning The lower end of the button at the upper position of the block is provided with a plurality of upper ratchet teeth in a V shape with an opening upward along the circumference, a first elastic reset mechanism is provided between the upper end of the gas storage tank and the inner side of the upper part of the button, a second elastic reset mechanism is provided between the outer side of the lower part of the gas storage tank and the inner side of the lower part of the knob, the outgoing air passage includes at least one outgoing air hole provided at intervals along the circumference on the outer side of the lower part of the outer cylinder, the inner air outlet passage includes inner air outlet holes corresponding to the outgoing air holes and provided on the outer side of the lower part of the gas storage tank, a transition air inlet hole corresponding to the inner air inlet hole is provided on the outer side of the upper part of the knob, and the knob The outer side of the lower part is provided with a transition air outlet hole corresponding to the inner air outlet hole one by one. When the gas storage tank is in a charging state, the positioning block moves from the long slot to the short slot at an adjacent position, and the outer air inlet hole, the transition air inlet hole and the inner air inlet hole correspond to each other and are interconnected, and the inner air outlet hole, the transition air outlet hole and the outer air outlet hole are not connected to each other. When the gas storage tank is in a de-energized state, the positioning block moves from the short slot to the long slot at an adjacent position, and the inner air outlet hole, the transition air outlet hole and the outer air outlet hole correspond to each other and are interconnected, and the outer air inlet hole, the transition air inlet hole and the inner air inlet hole are not connected to each other.

[0011] The telescopic sealing assembly may include an upper telescopic component and a lower telescopic component, the upper telescopic component includes an upper mounting tube, an upper connecting sleeve, a third elastic reset member and an upper sealing plate, an upper mounting tube which is sleeved on the outside of the charging tube is fixedly mounted on the upper end of the outer tube, a lower supporting plate is fixedly mounted between the inner side of the lower part of the upper mounting tube and the outer side of the lower end of the charging tube, an upper supporting plate which is sleeved on the outer side of the charging tube is fixedly mounted on the inner side of the upper part of the upper mounting tube corresponding to the position above the lower supporting plate, an upper connecting sleeve which is sealingly sleeved on the outer side of the charging tube is provided on the inner side of the upper supporting plate, a first baffle is fixedly mounted on the outer side of the lower end of the upper connecting sleeve which is corresponding to the position between the upper supporting plate and the lower supporting plate, and a plurality of first guide holes which penetrate up and down are evenly distributed along the circumference of the upper end of the lower supporting plate. , a second guide hole is provided at the upper end of the button corresponding to each first guide hole position, and a support strip is provided in each first guide hole, and the lower side passes through the second guide hole at the corresponding position and abuts against the upper end of the knob, and the upper side of each support strip is fixedly installed with the corresponding position of the lower side of the first baffle plate, and a third elastic reset member is provided between the lower side of the upper support plate and the upper side of the first baffle plate, and an upper supporting boss is fixed to the outer side of the upper part of the upper connecting sleeve corresponding to the position above the upper support plate, and an upper sealing piece is radially slidably installed on the upper part of the upper mounting tube with the inner side contacting with the upper supporting boss. When the positioning block moves from the long slot to the short slot, the upper supporting boss moves downward and staggered with the upper sealing piece;

[0012] The lower telescopic assembly includes a lower mounting tube, a lower connecting sleeve, a fourth elastic reset piece and a lower sealing piece. The lower end of the outer tube is fixedly mounted with a lower mounting tube, the lower mounting tube is sleeved with a lower connecting sleeve, the outer side of the upper end of the lower connecting sleeve is fixedly mounted with a second baffle, a guide sleeve is sleeved between the outer side of the lower part of the gas tank and the inner side of the outer tube, the lower end of the guide sleeve is fixedly mounted with the upper side of the second baffle, a fourth elastic reset piece is provided between the outer side of the guide sleeve and the inner side of the lower part of the outer tube, a lower supporting boss is fixedly mounted on the outer side of the lower connecting sleeve, and a lower sealing piece is radially slidably mounted on the lower part of the lower mounting tube, the lower supporting boss moves downward when the positioning block moves from the long slot to the short slot and is staggered with the lower separating piece.

[0013] The above-mentioned upper sealing piece may include a first upper sealing plate and a first lower sealing plate. An upper end cover is provided above the upper mounting tube. The upper end cover is a cylindrical structure with a closed upper end and an open lower end. An upper mounting hole is provided in the center of the upper end of the upper end cover, which passes through the upper and lower ends. The upper outer side of the charging tube is sealed and sleeved in the upper mounting hole. A plurality of first upper guide blocks are distributed along the circumference at intervals at the lower end of the upper end cover. The upper end of the upper mounting tube between two adjacent first upper guide blocks is fixed with a first lower guide block. A fan-shaped first upper sealing plate is slidably installed at the lower end of the upper end cover between each two adjacent first upper guide blocks. A fan-shaped first lower baffle plate is slidably installed on the upper end of the upper mounting tube at the intermediate position, the upper side of each first lower baffle plate contacts with the lower side of the first upper baffle plate at the adjacent position, the inner side of each first upper baffle plate and the inner side of each first lower baffle plate contact with the outer side of the upper supporting boss, the upper side of each first upper baffle plate and the upper side of each first lower baffle plate are provided with an upper strip sliding hole which passes through from top to bottom, an upper fixing rod is passed through each upper strip sliding hole, the upper side of each upper fixing rod is fixedly installed with the corresponding position of the lower end of the upper end cover, and the lower side of each upper fixing rod is fixedly installed with the corresponding position of the upper side of the upper support plate.

[0014] The above-mentioned lower sealing piece may include a second upper sealing plate and a second lower sealing plate, a lower end cover is provided under the lower mounting tube, the lower end cover is a cylindrical structure with an upper end open and a lower end closed, a lower mounting hole is provided in the center of the lower end of the lower end cover, the lower outer side of the lower part of the lower supporting boss is sleeved in the lower mounting hole, a plurality of second lower guide blocks are distributed along the circumference at intervals on the upper end of the lower end cover, a second upper guide block is fixed to the lower end of the lower mounting tube between two adjacent second lower guide blocks, a fan-shaped second upper sealing plate is slidably installed on the lower end of the lower mounting tube between each two adjacent second upper guide blocks, and a fan-shaped second upper sealing plate is slidably installed on the upper end of the lower end cover between each two adjacent second lower guide blocks The second lower baffle plate, the upper side of each second lower baffle plate contacts with the lower side of the second upper baffle plate at the adjacent position, the inner side of each second upper baffle plate and the inner side of each second lower baffle plate contact with the outer side of the upper part of the lower supporting boss, the upper side of each second upper baffle plate and the upper side of each second lower baffle plate are provided with a lower strip sliding hole that passes through from top to bottom, the upper side of the second baffle plate corresponding to each lower strip sliding hole position is provided with a through hole that passes through from top to bottom, each lower strip sliding hole is penetrated by a lower fixing rod, the upper side of each lower fixing rod passes through the corresponding through hole and is fixedly installed with the corresponding position of the lower end of the gas storage tank, and the lower side of each lower fixing rod is fixedly installed with the corresponding position of the lower end cover.

[0015] The above-mentioned gas storage tank may include an upper gas cylinder and a lower gas cylinder fixedly installed together, both of which are cylindrical structures, and a sealing inner ring platform is fixedly installed on the inner side of the upper part of the upper gas cylinder, and the upper end of the sealing inner ring platform and the inner side of the upper part of the upper gas cylinder form an air intake cavity, and the inner air intake holes are arranged at intervals along the circumference on the outer side of the upper gas cylinder above the sealing inner ring platform, and the lower end of the sealing inner ring platform and the inner side of the lower part of the upper gas cylinder and the inner side of the lower gas cylinder form an air storage cavity, and the inner air outlet holes are arranged at intervals along the circumference on the outer side of the lower part of the lower gas cylinder, and the upper side of each lower fixed rod passes through the corresponding penetration hole and is fixedly installed with the lower end of the lower gas cylinder, and a switch hole that passes through the center of the sealing inner ring platform is provided, and the one-way valve includes a valve seat , valve stem, valve core and compression spring. A valve seat is threaded in the upper air storage cylinder corresponding to the position below the isolation inner ring platform. A first flow channel which is wide at the top and narrow at the bottom is provided in the center of the valve seat. A valve stem with a tubular structure is mounted on the inner side of the upper part of the valve seat. A number of second flow channels which are connected inside and outside are evenly distributed along the circumference on the outer side of the upper part of the valve stem. A valve core is fixedly installed on the upper end of the valve stem. The valve core is conical in shape which is small at the top and large at the bottom. A compression spring which can make the outer side of the upper part of the valve core and the inner side of the lower part of the switch hole sealed is provided on the inner side of the valve stem. A first step is provided on the outer side of the upper part of the lower air storage cylinder. A second step is provided on the inner side of the knob corresponding to the position above the first step. A second elastic reset member is installed between the first step and the second step.

[0016] The inner side of the upper end of the guide sleeve may be provided with a first inner ring platform and a second inner ring platform at intervals in the upper and lower parts. The upper end of the guide sleeve is provided with a plurality of inner-outer connected fixing grooves evenly spaced along the circumference. The lower end of each fixing groove is located below the upper end of the second inner ring platform. Each fixing groove is provided with a fan-shaped fixing block fixedly installed with the inner side of the lower part of the outer cylinder. The inner diameter of the fixing block is the same as the inner diameter of the second inner ring platform. The fourth elastic reset member is arranged between the upper end of the fixing block and the lower end of the first inner ring platform.

[0017] The lower part of the charging tube may be a Rafale nozzle structure.

[0018] The structure of the present invention is reasonable and compact. When in use, the charging tube and the tube string are connected together and then lowered into the well, and a pressurized medium, such as supercritical carbon dioxide, is charged into the charging tube. When the gas storage tank is in a charged state, the outer air inlet channel and the inner air inlet channel, the inner air outlet channel and the outer air outlet channel are not connected to each other, the one-way valve is opened, the air inlet chamber and the air storage chamber are connected to each other, and the pressurized medium in the charging tube passes through the outer air inlet channel, the inner air inlet channel, the air inlet chamber and the switch hole in sequence and enters the air storage chamber. When the medium pressure in the air storage chamber reaches a set value (greater than the opening pressure of the one-way valve), the one-way valve closes the switch hole, and a medium for fracturing with a certain pressure is stored in the air storage chamber. Since the pressurized medium is passed into the charging tube and acts on the switching assembly, the telescopic sealing assembly can retract inward at this time, so that the energy-concentrating fracturing tool can move along the axial direction in the well, and the charging process can be realized during the movement, thereby saving time and improving work efficiency.

[0019] When the energy-focused fracturing tool is lowered into the target position in the well, the energy-release fracturing operation can be carried out, and the pressurized medium is filled into the charging tube again. When the gas tank releases energy, the telescopic sealing assembly extends outward and abuts against the inner wall of the casing, so that the energy-focused fracturing tool can be fixed at the target position in the casing. At this time, the external air inlet channel and the internal air inlet channel are not connected to each other, the one-way valve is closed, the air inlet chamber and the air storage chamber are not connected to each other, the internal air outlet channel and the external air outlet channel are connected to each other, and the pressurized medium in the air storage chamber passes through the internal air outlet channel and the external air outlet channel in turn and enters the well wall perforation, thereby realizing the fracturing operation at the target position in the well.

[0020] By repeating the above operations, pressure operations at multiple target locations in the well can be achieved.

[0021] The energy-concentrating fracturing tool of the present invention can realize repeated charging and fracturing, and there is no need to carry out charging at the wellhead, and the charging of supercritical carbon dioxide can be completed underground, thereby saving operation time and improving efficiency.

[0022] The energy-concentrating fracturing tool of the present invention is provided with a telescopic sealing assembly and has a space isolation function. It is unnecessary to lower a packer, thereby realizing the integration of packing and fracturing and reducing the waste of materials.

[0023] The energy-focused fracturing tool of the present invention has an ingenious structure and can expand the gas storage chamber through modification. Even if the well site conditions do not allow for charging underground, multiple fracturing can be achieved with one charge, thus reducing the number of lifts and effectively reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 It is a schematic diagram of the front cross-sectional structure when using embodiments 1 to 8 of the present invention.

[0025] Attached Figure 2 It is a schematic diagram of the front cross-sectional structure of embodiments one to eight of the present invention.

[0026] Attached Figure 3 It is a schematic diagram of the front cross-sectional structure of embodiments 1 to 8 of the present invention when the outer cylinder is removed.

[0027] Attached Figure 4 It is a schematic diagram of the main structure of embodiments 1 to 8 of the present invention when the outer cylinder is removed.

[0028] Attached Figure 5 It is a schematic diagram of the front cross-sectional structure of the gas storage tank in embodiments 1 to 8 of the present invention.

[0029] Attached Figure 6 It is a schematic diagram of the main structure of the gas storage tank in embodiments 1 to 8 of the present invention.

[0030] Attached Figure 7 Schematic diagram of the three-dimensional structure of embodiments 1 to 8 of the present invention when the outer cylinder is removed Figure 1 .

[0031] Attached Figure 8 Schematic diagram of the three-dimensional structure of embodiments 1 to 8 of the present invention when the outer cylinder is removed Figure 2 .

[0032] Attached Fig. 9 It is a schematic diagram of the three-dimensional structure of the button in Embodiments 2 to 8 of the present invention.

[0033] Attached Fig.10 It is a schematic diagram of the three-dimensional structure of the knob in Embodiments 2 to 8 of the present invention.

[0034] Attached Fig.11 It is a schematic diagram of the three-dimensional structure of the rotating cylinder in Embodiments 2 to 8 of the present invention.

[0035] Attached Fig.12 It is a schematic diagram of the front and cross-sectional structure of the rotating cylinder in embodiments 2 to 8 of the present invention.

[0036] Attached Fig.13 It is a schematic diagram of the three-dimensional structure of the lower connecting sleeve in embodiments three to eight of the present invention.

[0037] Attached Fig.14 It is a schematic diagram of the top view of the structure when the upper end cover is removed in embodiments 4 to 8 of the present invention.

[0038] Attached Fig.15 It is a schematic diagram of the bottom view structure when the lower end cover is removed in embodiments 5 to 8 of the present invention.

[0039] Attached Fig.16 It is a bottom view structural schematic diagram of the outer cylinder in Embodiments 7 to 8 of the present invention.

[0040] Attached Fig.17 It is a schematic cross-sectional structural diagram of the outer cylinder in Embodiments 7 to 8 of the present invention.

[0041] The codes in the accompanying drawings are: 1 is an outer tube, 2 is a charging tube, 3 is an air inlet cavity, 4 is an air storage cavity, 5 is a switch hole, 6 is a knob, 7 is a button, 8 is a rotating tube, 9 is a first elastic reset member, 10 is a second elastic reset member, 11 is a limiting inner ring platform, 12 is an outer air inlet hole, 13 is an inner air inlet hole, 14 is a long groove, 15 is a short groove, 16 is a lower ratchet, 17 is a positioning block, 18 is an upper ratchet, 19 is an outer air hole, 20 is an inner air outlet, 21 is a transition air inlet hole, 22 is a transition air outlet, 23 is an upper mounting tube, 24 is an upper connecting sleeve, 25 is a third elastic reset member, 26 is a lower support plate, 27 is an upper support plate, 28 is a first baffle, 29 is a support bar, 30 is an upper support boss, 31 is a lower mounting tube, 32 is a lower connecting sleeve, 33 is a fourth elastic reset member, and 34 is a second baffle , 35 is a guide sleeve, 36 is a lower supporting boss, 37 is a first upper baffle plate, 38 is a first lower baffle plate, 39 is an upper end cover, 40 is a first upper guide block, 41 is a first lower guide block, 42 ​​is an upper strip-shaped sliding hole, 43 is an upper fixing rod, 44 is a second upper baffle plate, 45 is a second lower baffle plate, 46 is a lower end cover, 47 is a second lower guide block, 48 is a second upper guide block, 49 is a lower strip-shaped sliding hole, 50 is a lower fixing rod, 51 is an upper air storage cylinder, 52 is a lower air storage cylinder, 53 is a valve seat, 54 is a valve stem, 55 is a valve core, 56 is a sealing inner ring platform, 57 is a compression spring, 58 is a first flow passage, 59 is a second flow passage, 60 is a first step, 61 is a second step, 62 is a first inner ring platform, 63 is a second inner ring platform, 64 is a fixing groove, 65 is a fixing block, and 66 is a slider. DETAILED DESCRIPTION

[0042] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0043] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0044] The present invention will be further described below in conjunction with embodiments and drawings:

[0045] Embodiment 1: As shown in the attached Figures 1 to 8As shown, the energy-focused fracturing tool comprises an outer tube 1, a charging tube 2, an air storage tank, a telescopic sealing assembly and a switching assembly. The charging tube 2 is fixedly installed on the inner side of the upper end of the outer tube 1, and the air storage tank is installed in the outer tube 1 corresponding to the position below the charging tube 2. A closed air inlet chamber 3 and a closed air storage chamber 4 are arranged at intervals in the upper and lower parts of the air storage tank. A switch hole 5 is arranged in the middle part of the air storage tank, and the upper end of the switch hole 5 is connected to the lower part of the air inlet chamber 3. The lower end of the switch hole 5 is connected to the upper part of the air storage chamber 4. A one-way valve capable of opening and closing the switch hole 5 is arranged in the air storage chamber 4. A telescopic sealing assembly capable of radial contraction is arranged at the upper and lower parts of the outer tube 1, and a switching assembly is arranged between the outer side of the air storage tank and the inner side of the outer tube 1. The upper part of the switching assembly is provided with an external air inlet channel connected to the lower part of the charging tube 2, and the outer side of the upper part of the air storage tank is provided with a An inner air inlet channel is connected, an inner air outlet channel connected to the air storage chamber 4 is provided on the outer side of the lower part of the air storage tank, and an outer air outlet channel connected to the inner and outer parts is provided on the outer side of the lower part of the outer tube 1. After the pressurized medium is introduced into the charging tube 2, the switching assembly can make the air storage tank be in a charging state or a discharging state. When the air storage tank is in the charging state, the outer air inlet channel and the inner air inlet channel, the inner air outlet channel and the outer air outlet channel are not connected to each other, the one-way valve is opened, the air inlet chamber 3 and the air storage chamber 4 are connected to each other, and the telescopic sealing assembly can retract inward; when the air storage tank is in the discharging state, the outer air inlet channel and the inner air inlet channel are not connected to each other, the one-way valve is closed, the air inlet chamber 3 and the air storage chamber 4 are not connected to each other, the inner air outlet channel and the outer air outlet channel are connected to each other, and the telescopic sealing assembly extends outward and can be in sealing contact with the well wall.

[0046] According to the requirements, in order to facilitate the installation of the gas storage tank, the outer cylinder 1 can be set as a multi-level structure. In this embodiment, the outer cylinder 1 includes an upper cylinder and a lower cylinder which are fixedly installed together from top to bottom.

[0047] During use, the charging tube 2 is connected to the pipe string and lowered into the well, and a pressurized medium, such as supercritical carbon dioxide, is charged into the charging tube 2. When the gas storage tank is in a charged state, the outer air inlet channel and the inner air inlet channel, the inner air outlet channel and the outer air outlet channel are not connected to each other, the one-way valve is opened, the air inlet chamber 3 and the air storage chamber 4 are connected to each other, and the pressurized medium in the charging tube 2 passes through the outer air inlet channel, the inner air inlet channel, the air inlet chamber 3 and the switch hole 5 in turn and enters the air storage chamber 4. When the medium pressure in the air storage chamber 4 reaches a set value (greater than the opening pressure of the one-way valve), the one-way valve closes the switch hole 5, and a medium for fracturing of a certain pressure is stored in the air storage chamber 4. Since the pressurized medium is passed into the charging tube 2 and acts on the switching assembly, the telescopic sealing assembly can retract inward at this time, so that the energy-concentrating fracturing tool can move along the axial direction in the well, and the charging process can be realized during the movement, thereby saving time and improving work efficiency.

[0048] When the energy-focused fracturing tool is lowered into the target position in the well, the energy-release fracturing operation can be carried out, and the pressurized medium is filled into the charging tube 2 again. When the gas storage tank is in the energy-release state, the telescopic sealing assembly extends outward and abuts against the inner wall of the casing, so that the energy-focused fracturing tool can be fixed at the target position in the casing. At this time, the external air inlet channel and the internal air inlet channel are not connected to each other, the one-way valve is closed, the air inlet chamber 3 and the air storage chamber 4 are not connected to each other, the internal air outlet channel and the external air outlet channel are connected to each other, and the pressurized medium in the air storage chamber 4 passes through the internal air outlet channel and the external air outlet channel in turn and enters the well wall perforations, thereby realizing the fracturing operation at the target position in the well.

[0049] By repeating the above operations, pressure operations at multiple target locations in the well can be achieved.

[0050] The energy-concentrating fracturing tool of the present invention can realize repeated charging and fracturing, and there is no need to carry out charging at the wellhead, and the charging of supercritical carbon dioxide can be completed underground, thereby saving operation time and improving efficiency.

[0051] The energy-focusing fracturing tool of the present invention is provided with a telescopic sealing assembly and has a spatial isolation function. It is no longer necessary to lower a packer, thereby realizing integrated packing and fracturing, saving costs while also improving efficiency and reducing material waste.

[0052] The energy-focused fracturing tool of the present invention has an ingenious structure and can expand the gas storage chamber 4 through modification. Even if the well site conditions do not allow for charging underground, multiple fracturing can be achieved with one charge, thus reducing the number of lifts and effectively reducing costs.

[0053] The present invention can release energy instantly through high-pressure supercritical carbon dioxide to act on the reservoir, so that the reservoir forms more and more complex fracture networks. High-pressure instantaneous fracturing reduces supercritical carbon dioxide filtration loss, and the operation success rate is higher. It is also suitable for fracturing and transformation of high-permeability and serious leakage reservoirs. After fracturing is completed, carbon dioxide is easy to flow back and the damage to the reservoir is very small.

[0054] Supercritical carbon dioxide energy fracturing can utilize the special properties of supercritical carbon dioxide and combine it with the energy-gathering effect to produce the following obvious technical advantages during the fracturing process: (1) Carbon dioxide is widely available and easy to obtain, is non-flammable and non-explosive, and is easy to control and transport; (2) Supercritical carbon dioxide has a low viscosity, close to that of a gas, a very low surface tension, close to zero, a low friction coefficient, and is easy to flow; (3) Supercritical carbon dioxide fluid will not cause clay expansion in the reservoir, fundamentally avoiding the occurrence of hazards such as water lock effect and rock wettability reversal, and effectively protecting the reservoir from damage; (4) Supercritical carbon dioxide is used for fracturing, and the flowback is rapid and thorough. It is a low-damage clean fracturing fluid that can also shorten the production cycle; (5) Compared with conventional fracturing fluids, supercritical carbon dioxide fracturing fluids have strong diffusion and permeability, and can easily penetrate into the pores and microcracks in the reservoir, which is conducive to the generation of a large number of microcrack networks.

[0055] The above-mentioned concentrated energy fracturing tool can be further optimized and / or improved according to actual needs:

[0056] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figures 1 to 12As shown, the switching assembly includes a knob 6, a button 7, a rotating cylinder 8, a first elastic reset mechanism and a second elastic reset mechanism. A limited inner ring 11 is fixed to the inner side of the upper part of the outer cylinder 1 corresponding to the position of the air inlet chamber 3. A tubular knob 6 is sleeved between the outer side of the air storage tank and the inner side of the outer cylinder 1. A button 7 with an upper end located below the charging tube 2 is sleeved on the outer side of the upper part of the knob 6. The button 7 is a tubular structure with an open lower end and a closed upper end. The outer air inlet channel includes at least one outer air inlet hole 12 uniformly distributed along the circumference on the outer side of the upper part of the button 7. The inner air inlet channel includes a one-to-one correspondence with the outer air inlet hole 12 and is arranged on the outer side of the upper part of the air storage tank. The inner air inlet hole 13 corresponds to the outer side of the knob 6 at the lower end of the limiting inner ring 11, and a tubular rotating cylinder 8 is slidably installed along the axial direction. At least two long grooves 14 with lower end openings are evenly distributed along the circumference of the lower outer side of the rotating cylinder 8. The lower end of the rotating cylinder 8 between each two adjacent long grooves 14 is provided with a short groove 15 connected inside and outside, and the upper end of the short groove 15 is located below the upper end of the long groove 14. A lower ratchet 16 with a tooth tip downward is formed between each two adjacent long grooves 14 and the short groove 15. A positioning block 17 fixedly installed with the outer side of the knob 6 is provided in each long groove 14, and the corresponding upper position of the positioning block 17 The lower end of the button 7 is provided with a plurality of upper ratchet teeth 18 in a V shape with an opening upward along the circumference, a first elastic reset mechanism is provided between the upper end of the gas storage tank and the inner side of the upper part of the button 7, a second elastic reset mechanism is provided between the outer side of the lower part of the gas storage tank and the inner side of the lower part of the knob 6, the outgoing air passage includes at least one outgoing air hole 19 provided at intervals along the circumference on the outer side of the lower part of the outer tube 1, the inner air outlet passage includes inner air outlet holes 20 corresponding to the outgoing air holes 19 and provided on the outer side of the lower part of the gas storage tank, the outer side of the upper part of the knob 6 is provided with transition air inlet holes 21 corresponding to the inner air inlet holes 13, and the outer side of the lower part of the knob 6 is provided with a transition air inlet hole 21 corresponding to the inner air inlet hole 13. A corresponding transition air outlet 22, when the gas tank is in the charging state, the positioning block 17 moves from the long slot 14 to the short slot 15 at the adjacent position, the outer air inlet 12, the transition air inlet 21 and the inner air inlet 13 correspond to each other and are connected to each other, and the inner air outlet 20, the transition air outlet 22 and the outer air outlet 19 are not connected to each other, when the gas tank is in the de-energized state, the positioning block 17 moves from the short slot 15 to the long slot 14 at the adjacent position, the inner air outlet 20, the transition air outlet 22 and the outer air outlet 19 correspond to each other and are connected to each other, and the outer air inlet 12, the transition air inlet 21 and the inner air inlet 13 are not connected to each other.

[0057] According to the requirements, the first elastic reset member 9 is a known compression spring. The upper end of the knob 6 is located above the upper end of the gas storage tank. The outer side of the button 7 is in sealing contact with the inner side of the limiting inner ring stage 11. The limiting inner ring stage 11 is fixed to the inner side of the upper cylinder. The outer side of the rotating cylinder 8 is fixedly installed with the inner side of the outer cylinder 1. The inner side of the rotating cylinder 8 is provided with a plurality of long strip slide grooves with openings downwardly distributed along the circumference. A slider 66 fixedly installed with the outer side of the button 7 is slidably installed in each long strip slide groove. In this embodiment, the total number of the long slots 14 and the short slots 15 is The inner wall of one side of the long strip slide groove is flush with the inner wall of one side of the long groove 14 and the inner wall of one side of the short groove 15, which is the same as the total number of the long strip slide grooves. In this way, the positioning block 17 can smoothly move alternately in the long groove 14 and the short groove 15. The upper side of the positioning block 17 corresponding to the inner position of the rotating cylinder 8 extends upward along the long strip slide groove at the corresponding position and forms a guiding inclined surface with the same inclination direction as the side surface of the upper ratchet 18 between the long groove 14 and the short groove 15. The long groove 14 is rectangular, and the short groove 15 can be rectangular or V-shaped with the opening downward.

[0058] During use, when the gas tank is charged, supercritical carbon dioxide is charged into the charging tube 2. The supercritical carbon dioxide acts on the upper end of the button 7 to move the button 7 downward, and the button 7 compresses the first elastic reset member 9. The first elastic reset member 9 is compressed. At the same time, when the button 7 moves downward, the lower end of the upper ratchet 18 at the lower end of the button 7 moves downward. After the side surface of the upper ratchet 18 contacts the guiding inclined surface of the positioning block 17, the upper ratchet 18 continues to squeeze the positioning block 17. The positioning block 17 drives the knob 6 to move downward and squeezes the second elastic reset member 10. The second elastic reset member 10 is compressed, and the inclined surface of the upper ratchet 18 and the guiding inclined surface of the positioning block 17 are offset under the action of the second elastic reset member 10 and the constraint of the long groove 14. When the positioning block 17 moves out of the long groove 14, the upper ratchet 18 is pressed against the guiding inclined surface of the positioning block 17. After the upper end moves downward to the side of the lower ratchet 16, the positioning block 17 is no longer constrained by the long slot 14, and the guiding inclined surface of the positioning block 17 moves along the side of the upper ratchet 18 to the side of the lower ratchet 16. When the upper side of the positioning block 17 is completely pushed to the bottom of the tooth tip of the lower ratchet 16 by the upper ratchet 18, the upper side of the positioning block 17 rotates to the lower end of the adjacent short slot 15. At this time, the upper side surface of the positioning block 17 is located on the other side of the upper ratchet 18, and the guiding inclined surface of the positioning block 17 is no longer squeezed by the inclined surface of the upper ratchet 18. At this time, the second elastic reset member 10 is reset, so that the knob 6 drives the positioning block 17 to move upward, and finally the positioning block 17 moves into the short slot 15. Since the upper end of the short slot 15 is located below the upper end of the long slot 14, the positioning block 17 and the knob 6 move downward relative to the initial position.

[0059] At the same time, the first elastic reset member 9 starts to reset, so that the button 7 moves upward to the initial position, that is, the position of the button 7 and the position of the gas storage tank do not change, the positions of the outer air inlet 12 and the inner air inlet 13 remain unchanged, and after the positioning block 17 and the knob 6 spirally move relative to the initial position, the outer air inlet 12, the transition air inlet 21 and the inner air inlet 13 correspond to each other and are connected to each other, while the inner air outlet 20, the transition air outlet 22 and the outer air outlet 19 are not connected to each other, that is, the inner air outlet 20 of the gas storage tank is closed by the knob 6 is closed, and the supercritical carbon dioxide filled in the charging tube 2 passes through the outer air inlet hole 12, the transition air inlet hole 21 and the inner air inlet hole 13 in sequence and then enters the air inlet chamber 3. When the pressure in the air inlet chamber 3 is greater than the opening pressure of the one-way valve, the supercritical carbon dioxide in the air inlet chamber 3 passes through the switch hole 5 and then enters the air storage chamber 4, so that the supercritical carbon dioxide is stored in the air storage chamber 4. When the supercritical carbon dioxide pressure in the air storage chamber 4 reaches the set value, the one-way valve closes the switch hole 5, thereby realizing the charging process of the air storage tank.

[0060] During the process of charging the gas storage tank, the positioning block 17 and the knob 6 spiral downward relative to the initial position, and the telescopic sealing assembly can be retracted inward, so that the concentrated energy fracturing tool can be moved axially in the casing through the pipe string.

[0061] When fracturing is required after the gas tank is fully charged, the energy-collecting fracturing tool is moved axially to the target position in the casing through the pipe string, and the medium is filled into the charging tube 2 (high-pressure supercritical carbon dioxide can be continuously filled, and a certain amount of high-pressure fracturing medium can also be filled). After the medium acts on the upper end of the button 7, the button 7 moves downward, and the button 7 compresses the first elastic reset member 9. The first elastic reset member 9 is compressed. At the same time, when the button 7 moves downward, the lower end of the upper ratchet 18 at the lower end of the button 7 moves downward. After the side surface of the upper ratchet 18 contacts the guiding inclined surface of the positioning block 17, the upper ratchet 18 continues to squeeze the positioning block 17. The positioning block 17 drives the knob 6 to move downward and squeezes the second elastic reset member 10. The second elastic reset member 10 is compressed, and the inclined surface of the upper ratchet 18 and the guiding inclined surface of the positioning block 17 are under the action of the second elastic reset member 10 and The second elastic reset member 10 is reset at this time, so that the knob 6 drives the positioning block 17 to move upward, and finally the positioning block 17 moves into the long slot 14. Since the upper end of the short slot 15 is located below the upper end of the long slot 14, the positioning block 17 and the knob 6 move upward relative to the energized state.

[0062] At the same time, the first elastic reset member 9 begins to reset, so that the button 7 moves upward to the initial position, that is, the position of the button 7 and the position of the gas tank do not change, the positions of the outer air inlet hole 12 and the inner air inlet hole 13 remain unchanged, the positioning block 17 and the knob 6 return to the initial position after spiral movement, the transition air inlet hole 21 is staggered with the inner air inlet hole 13, the outer air inlet hole 12, the transition air inlet hole 21 and the inner air inlet hole 13 are not connected to each other, that is, the inner air inlet hole 13 of the gas tank is closed by the knob 6, and at the same time, the inner air outlet hole 20, the transition air outlet hole 22 and the outer air outlet hole 19 correspond to each other and are connected to each other. At this time, the high-pressure supercritical carbon dioxide in the gas tank enters the casing annulus through the inner air outlet hole 20, the transition air outlet hole 22 and the outer air outlet hole 19 in turn, thereby performing fracturing operations on the target position.

[0063] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figures 1 to 13As shown, the telescopic sealing assembly includes an upper telescopic component and a lower telescopic component, the upper telescopic component includes an upper mounting tube 23, an upper connecting sleeve 24, a third elastic reset member 25 and an upper sealing plate, the upper end of the outer tube 1 is fixedly mounted with an upper mounting tube 23 sleeved on the outer side of the charging tube 2, a lower support plate 26 is fixedly mounted between the inner side of the lower part of the upper mounting tube 23 and the outer side of the lower end of the charging tube 2, an upper support plate 27 sleeved on the outer side of the charging tube 2 is fixedly mounted on the inner side of the upper part of the upper mounting tube 23 corresponding to the position above the lower support plate 26, an upper connecting sleeve 24 sealingly sleeved on the outer side of the charging tube 2 is provided on the inner side of the upper support plate 27, a first baffle 28 is fixedly mounted on the outer side of the lower end of the upper connecting sleeve 24 corresponding to the position between the upper support plate 27 and the lower support plate 26, and a plurality of first guides penetrating from top to bottom are evenly spaced along the circumference of the upper end of the lower support plate 26. Hole, a second guide hole is provided at the upper end of the button 7 corresponding to each first guide hole position, and a support bar 29 is provided in each first guide hole, and the lower side passes through the second guide hole at the corresponding position and then abuts against the upper end of the knob 6. The upper side of each support bar 29 is fixedly installed with the corresponding position of the lower side of the first baffle 28, and a third elastic reset member 25 sleeved on the outer side of the upper connecting sleeve 24 is provided between the lower side of the upper supporting plate 27 and the upper side of the first baffle 28. An upper supporting boss 30 is fixed to the outer side of the upper connecting sleeve 24 corresponding to the upper position of the upper supporting plate 27. An upper sealing piece whose inner side contacts the upper supporting boss 30 is radially slidably installed on the upper part of the upper mounting tube 23. When the positioning block 17 moves from the long slot 14 to the short slot 15, the upper supporting boss 30 moves downward and staggers with the upper sealing piece.

[0064] The lower telescopic assembly includes a lower mounting tube 31, a lower connecting sleeve 32, a fourth elastic reset member 33 and a lower sealing piece. The lower end of the outer tube 1 is fixedly mounted with the lower mounting tube 31, the lower connecting sleeve 32 is sleeved inside the lower mounting tube 31, and the second baffle 34 is fixedly mounted on the outer side of the upper end of the lower connecting sleeve 32. A guide sleeve 35 whose upper end contacts the lower end of the knob 6 is sleeved between the outer side of the lower part of the gas storage tank and the inner side of the outer tube 1. The lower end of the guide sleeve 35 is fixedly mounted together with the upper side of the second baffle 34, and a fourth elastic reset member 33 is provided between the outer side of the guide sleeve 35 and the inner side of the lower part of the outer tube 1. A lower supporting boss 36 is fixedly mounted on the outer side of the lower part of the upper connecting sleeve 24, and a lower sealing piece whose inner side contacts the lower supporting boss 36 is radially slidably mounted on the lower part of the lower mounting tube 31, and the lower supporting boss 36 moves downward when the positioning block 17 moves from the long slot 14 to the short slot 15, and is staggered with the lower partition piece.

[0065] According to the requirements, the third elastic return member 25 and the fourth elastic return member 33 are both existing well-known compression springs. The cross-sections of the upper support boss 30 and the lower support boss 36 are both isosceles trapezoids that are narrow inside and wide outside. When the positioning block 17 moves from the short groove 15 to the long groove 14, the outer side of the upper support boss 30 moves upward and contacts with the upper sealing plate again, and the outer side of the lower support boss 36 moves upward and contacts with the lower sealing plate again.

[0066] During use, when the gas tank is charged, supercritical carbon dioxide is charged into the charging tube 2. The supercritical carbon dioxide acts on the upper end of the button 7 to move the button 7 downward, and the button 7 compresses the first elastic reset member 9. The first elastic reset member 9 is compressed. At the same time, when the button 7 moves downward, the lower end of the upper ratchet 18 at the lower end of the button 7 moves downward. After the side surface of the upper ratchet 18 contacts the guiding inclined surface of the positioning block 17, the upper ratchet 18 continues to squeeze the positioning block 17. The positioning block 17 drives the knob 6 to move downward and squeezes the second elastic reset member 10. The second elastic reset member 10 is compressed, and the inclined surface of the upper ratchet 18 and the guiding inclined surface of the positioning block 17 are offset under the action of the second elastic reset member 10 and the constraint of the long groove 14. When the positioning block 17 moves out of the long groove 14, the upper ratchet 18 is pressed against the guiding inclined surface of the positioning block 17. After the upper end moves downward to the side of the lower ratchet 16, the positioning block 17 is no longer constrained by the long slot 14, and the guiding inclined surface of the positioning block 17 moves along the side of the upper ratchet 18 to the side of the lower ratchet 16. When the upper side of the positioning block 17 is completely pushed to the bottom of the tooth tip of the lower ratchet 16 by the upper ratchet 18, the upper side of the positioning block 17 rotates to the lower end of the adjacent short slot 15. At this time, the upper side surface of the positioning block 17 is located on the other side of the upper ratchet 18, and the guiding inclined surface of the positioning block 17 is no longer squeezed by the inclined surface of the upper ratchet 18. At this time, the second elastic reset member 10 is reset, so that the knob 6 drives the positioning block 17 to move upward, and finally the positioning block 17 moves into the short slot 15. Since the upper end of the short slot 15 is located below the upper end of the long slot 14, the positioning block 17 and the knob 6 move downward relative to the initial position.

[0067] At the same time, the first elastic reset member 9 starts to reset, so that the button 7 moves upward to the initial position, that is, the position of the button 7 and the position of the gas storage tank do not change, the positions of the outer air inlet 12 and the inner air inlet 13 remain unchanged, and after the positioning block 17 and the knob 6 spirally move relative to the initial position, the outer air inlet 12, the transition air inlet 21 and the inner air inlet 13 correspond to each other and are connected to each other, while the inner air outlet 20, the transition air outlet 22 and the outer air outlet 19 are not connected to each other, that is, the inner air outlet 20 of the gas storage tank is closed by the knob 6 is closed, and the supercritical carbon dioxide filled in the charging tube 2 passes through the outer air inlet hole 12, the transition air inlet hole 21 and the inner air inlet hole 13 in sequence and then enters the air inlet chamber 3. When the pressure in the air inlet chamber 3 is greater than the opening pressure of the one-way valve, the supercritical carbon dioxide in the air inlet chamber 3 passes through the switch hole 5 and then enters the air storage chamber 4, so that the supercritical carbon dioxide is stored in the air storage chamber 4. When the supercritical carbon dioxide pressure in the air storage chamber 4 reaches the set value, the one-way valve closes the switch hole 5, thereby realizing the charging process of the air storage tank.

[0068] During the process of charging the gas storage tank, the positioning block 17 and the knob 6 spiral downward relative to the initial position, the upper end of the knob 6 is separated from the lower side of the support bar 29, and the third elastic reset member 25 gradually changes from a compressed state to a natural state. During the reset process, the third elastic reset member 25 acts on the first baffle plate 28, so that the first baffle plate 28 moves downward, and the first baffle plate 28 drives the upper connecting sleeve 24 to move downward. After the upper connecting sleeve 24 moves downward, the upper supporting boss 30 moves downward to below the upper sealing piece, and the outer side of the lower supporting boss 36 no longer supports the inner side of the upper sealing piece, so that the concentrated energy fracturing tool can be placed in the sleeve through the pipe string. When moving in the tube, the outer side of the upper sealing piece is squeezed by the inner wall of the casing and then contracts. When the positioning block 17 and the knob 6 spiral downward relative to their initial positions, the guide sleeve 35 squeezes the fourth elastic reset member 33 and moves downward, causing the lower connecting sleeve 32 to move downward, so that the lower supporting boss 36 moves downward and is located below the lower sealing piece. The outer side of the lower supporting boss 36 no longer supports the inner side of the lower sealing piece. In this way, when the energy-focused fracturing tool is moved, the outer side of the lower sealing piece will shrink inward after hitting the inner wall of the casing and will no longer be fixed to the outer tube 1. In this way, the energy-focused fracturing tool can be smoothly moved in the axial direction in the casing through the pipe string.

[0069] When fracturing is required after the gas tank is fully charged, the energy-collecting fracturing tool is axially moved to the target position in the casing through the pipe string, and a pressurized medium (such as supercritical carbon dioxide) is filled into the charging tube 2. The medium acts on the upper end of the button 7 to cause the button 7 to move downward, and the button 7 compresses the first elastic reset member 9. The first elastic reset member 9 is compressed. At the same time, when the button 7 moves downward, the lower end of the upper ratchet 18 at the lower end of the button 7 moves downward. After the side surface of the upper ratchet 18 contacts the guiding inclined surface of the positioning block 17, the upper ratchet 18 continues to squeeze the positioning block 17. The positioning block 17 drives the knob 6 to move downward and squeezes the second elastic reset member 10. The second elastic reset member 10 is compressed, and the inclined surface of the upper ratchet 18 and the guiding inclined surface of the positioning block 17 are offset under the action of the second elastic reset member 10 and the constraint of the long groove 14. When the guide block moves downward from the upper end of the short slot 15 to the side of the lower ratchet 16, the positioning block 17 is no longer constrained by the short slot 15, and the guiding inclined surface of the positioning block 17 moves along the side of the upper ratchet 18 to the side of the lower ratchet 16. When the upper side of the positioning block 17 is completely pushed to the bottom of the tooth tip of the lower ratchet 16 by the upper ratchet 18, the upper side of the positioning block 17 rotates to the lower end of the adjacent long slot 14. At this time, the upper side surface of the positioning block 17 is located at the other side of the upper ratchet 18, and the guiding inclined surface of the positioning block 17 is no longer squeezed by the inclined surface of the upper ratchet 18. At this time, the second elastic reset member 10 is reset, so that the knob 6 drives the positioning block 17 to move upward, and finally the positioning block 17 moves into the long slot 14. Since the upper end of the short slot 15 is located below the upper end of the long slot 14, the relative positions of the positioning block 17 and the knob 6 in the charged state move upward.

[0070] During the process of energy-release fracturing on the gas tank, the positioning block 17 and the knob 6 spirally move upward relative to the positions in the charged state, and the upper end of the knob 6 moves upward and squeezes the lower side of the support bar 29, so that the lower side of the support bar 29 moves upward to the initial position, and the support bar 29 drives the first baffle plate 28 to move upward to the initial position, so that the third elastic reset member 25 is compressed again, and the first baffle plate 28 moves upward and drives the upper connecting sleeve 24 to move upward, and the upper connecting sleeve 24 moves upward so that the outer side of the upper supporting boss 30 is aligned with the inner side of the upper sealing piece, and the outer side of the lower supporting boss 36 again supports the inner side of the upper sealing piece, that is, the outer side of the upper sealing piece is against the inner wall of the casing, so that the upper part of the energy-concentrating fracturing tool can be fixed to the inner side of the casing through the upper sealing piece.

[0071] When the positioning block 17 and the knob 6 move upward in a spiral motion relative to the position in the charged state, the upper end of the guide sleeve 35 is no longer squeezed by the lower end of the knob 6, and the fourth elastic reset member 33 gradually changes from a compressed state to a natural state, so that the guide sleeve 35 moves upward, and the lower connecting sleeve 32 moves upward through the second baffle 34, so that the upper support boss 30 is located on the inner side of the lower sealing piece after moving upward, and the outer side of the lower support boss 36 again supports the inner side of the lower sealing piece, that is, the outer side of the lower sealing piece abuts against the inner wall of the casing, so that the lower part of the energy-concentrating fracturing tool can be fixed to the inner side of the casing through the lower sealing piece, so that the outer side of the upper sealing piece and the outer side of the lower sealing piece both abut against the inner wall of the casing, and the energy-concentrating fracturing tool can be firmly fixed on the inner wall of the casing, which is convenient for fracturing operations at the target position.

[0072] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figures 1 to 8 As shown in Figures 14 and 15, the upper sealing piece includes a first upper sealing plate 37 and a first lower sealing plate 38. An upper end cover 39 is provided above the upper mounting tube 23. The upper end cover 39 is a cylindrical structure with a closed upper end and an open lower end. An upper mounting hole is provided in the center of the upper end of the upper end cover 39, and the upper outer side of the charging tube 2 is sealed and sleeved in the upper mounting hole. A plurality of first upper guide blocks 40 are distributed along the circumference at intervals at the lower end of the upper end cover 39. A first lower guide block 41 is fixed to the upper end of the upper mounting tube 23 between two adjacent first upper guide blocks 40. A fan-shaped first upper sealing plate 37 is slidably installed at the lower end of the upper end cover 39 between each two adjacent first upper guide blocks 40. A fan-shaped first lower baffle plate 38 is slidably installed on the upper end of the upper mounting tube 23 in the intermediate position, and the upper side of each first lower baffle plate 38 contacts with the lower side of the first upper baffle plate 37 at the adjacent position, and the inner side of each first upper baffle plate 37 and the inner side of each first lower baffle plate 38 contact with the outer side of the upper support boss 30, and the upper side of each first upper baffle plate 37 and the upper side of each first lower baffle plate 38 are provided with an upper strip sliding hole 42 that passes through from top to bottom, and an upper fixing rod 43 is passed through each upper strip sliding hole 42, and the upper side of each upper fixing rod 43 is fixedly installed with the corresponding position of the lower end of the upper end cover 39 on the upper side, and the lower side of each upper fixing rod 43 is fixedly installed with the corresponding position of the upper side of the upper support plate 27.

[0073] According to the requirements, a distance is provided between the lower side of the first baffle 28 and the upper side of the lower support plate 26 , and a distance is provided between the upper end of the upper connecting sleeve 24 and the inner wall of the upper end of the upper mounting tube 23 .

[0074] During use, by setting the first lower guide block 41 and the first upper guide block 40, radially penetrating guide grooves are formed between the two adjacent first upper guide blocks 40 and the two adjacent first lower guide blocks 41. When the button 7 drives the knob 6 to move downward, the upper end of the knob 6 no longer squeezes the support strip 29. At this time, the third elastic reset member 25 changes from a compressed state to a natural state, that is, the third elastic reset member 25 is reset, so that the upper support boss 30 moves downward and is located below the first upper baffle plate 37 and the first lower baffle plate 38, and the outer side of the lower support boss 36 no longer supports the inner side of the first upper baffle plate 37 and the first lower baffle plate 38. In this way, when the energy-concentrating fracturing tool is moved, the outer sides of the first upper baffle plate 37 and the first lower baffle plate 38 hit the The inner wall of the casing will shrink inward and no longer fix the outer cylinder 1. The setting of the upper strip sliding hole 42 and the upper fixing rod 43 can limit the telescopic range of the first upper baffle plate 37 and the first lower baffle plate 38, thereby preventing the first upper baffle plate 37 and the first lower baffle plate 38 from falling into the upper mounting tube 23 after retracting and causing malfunction. At the same time, the upper fixing rod 43 can also fix the upper end cover 39. The upper side of each first lower baffle plate 38 is in contact with the lower side of the first upper baffle plate 37 at the adjacent position. With this setting, when the outer side of the first lower baffle plate 38 and the outer side of the first upper baffle plate 37 are in contact with the inner wall of the casing, the annular space between the outer side of the upper part of the outer cylinder 1 and the casing can be sealed to prevent the gas in the gas storage chamber 4 from leaking during the fracturing process.

[0075] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figures 1 to 8As shown in Figures 15 and 16, the lower sealing piece includes a second upper sealing plate 44 and a second lower sealing plate 45. A lower end cover 46 is provided below the lower mounting tube 31. The lower end cover 46 is a cylindrical structure with an upper end open and a lower end closed. A lower mounting hole is provided in the center of the lower end of the lower end cover 46, and the lower outer side of the lower supporting boss 36 is sleeved in the lower mounting hole. A plurality of second lower guide blocks 47 are distributed along the circumference at intervals on the upper end of the lower end cover 46. A second upper guide block 48 is fixed to the lower end of the lower mounting tube 31 between two adjacent second lower guide blocks 47. A fan-shaped second upper sealing plate 44 is slidably installed on the lower end of the lower mounting tube 31 between each two adjacent second upper guide blocks 48. A fan-shaped second upper sealing plate 44 is slidably installed on the upper end of the lower end cover 46 between each two adjacent second lower guide blocks 47. The annular second lower baffle plate 45, the upper side of each second lower baffle plate 45 contacts with the lower side of the second upper baffle plate 44 at the adjacent position, the inner side of each second upper baffle plate 44 and the inner side of each second lower baffle plate 45 contact with the outer side of the upper part of the lower supporting boss 36, the upper side of each second upper baffle plate 44 and the upper side of each second lower baffle plate 45 are provided with a lower strip sliding hole 49 that passes through from top to bottom, the upper side of the second baffle plate 34 corresponding to the position of each lower strip sliding hole 49 is provided with a through hole that passes through from top to bottom, each lower strip sliding hole 49 is penetrated by a lower fixing rod 50, the upper side of each lower fixing rod 50 is fixedly installed with the corresponding position of the lower end of the gas storage tank after passing through the corresponding through hole, and the lower side of each lower fixing rod 50 is fixedly installed with the corresponding position of the lower end cover 46.

[0076] During use, by setting the second lower guide block 47 and the second upper guide block 48, radially penetrating guide grooves are formed between the two adjacent second upper guide blocks 48 and the two adjacent second lower guide blocks 47. When the button 7 drives the knob 6 to move downward, the guide sleeve 35 squeezes the fourth elastic reset member 33 and moves downward, so that the lower connecting sleeve 32 moves downward, so that the lower supporting boss 36 moves downward and is located below the second upper baffle plate 44 and the second lower baffle plate 45. The outer side of the lower supporting boss 36 no longer supports the inner side of the second upper baffle plate 44 and the second lower baffle plate 45. In this way, when the energy-focusing fracturing tool is moved, the outer side of the second upper baffle plate 44 and the second lower baffle plate 45 will shrink inward after hitting the inner wall of the casing and will no longer be fixed to the outer cylinder 1. The setting of the lower strip sliding hole 49 and the lower fixing rod 50 can support the second upper baffle plate 44 and the second lower baffle plate 45. The telescopic range of the partition 44 and the second lower partition plate 45 has a limiting effect, preventing the second upper partition plate 44 and the second lower partition plate 45 from falling into the lower mounting tube 31 after retracting and causing malfunction. At the same time, the lower fixing rod 50 can also fix the lower end cover 46. The setting of the through hole allows the lower connecting sleeve 32 and the guide sleeve 35 to move in the axial direction, avoiding damage to the fourth elastic reset member 33 after rotation, which can reduce the failure rate and extend the service life. The inner side of each second upper partition plate 44 and the inner side of each second lower partition plate 45 are in contact with the outer side of the upper part of the lower supporting boss 36. With this setting, when the outer side of the second lower partition plate 45 and the outer side of the second upper partition plate 44 are against the inner wall of the casing, the annulus between the outer side of the lower part of the outer tube 1 and the casing can be sealed to prevent gas leakage in the gas storage chamber 4 during fracturing.

[0077] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2As shown in Figures 3 and 5, the gas storage tank includes an upper gas cylinder 51 and a lower gas cylinder 52 fixedly installed together. The upper gas cylinder 51 and the lower gas cylinder 52 are both cylindrical structures. A sealing inner ring platform 56 is fixedly installed on the inner side of the upper part of the upper gas cylinder 51. The upper end of the sealing inner ring platform 56 and the inner side of the upper part of the upper gas cylinder 51 form an air inlet cavity 3. The inner air inlet holes 13 are arranged at intervals along the circumference on the outer side of the upper gas cylinder 51 above the sealing inner ring platform 56. The lower end of the sealing inner ring platform 56 and the inner side of the lower part of the upper gas cylinder 51 and the inner side of the lower gas cylinder 52 form an air storage cavity 4. The inner air outlet holes 20 are arranged at intervals along the circumference on the outer side of the lower part of the lower gas cylinder 52. The upper side of each lower fixed rod 50 passes through the corresponding penetration hole and is fixedly installed with the lower end of the lower gas cylinder 52. A switch hole 5 that passes through from top to bottom is provided in the center of the sealing inner ring platform 56. The one-way valve includes a valve seat 53 and a valve stem 54, a valve core 55 and a compression spring 57. A valve seat 53 is threadedly connected in the upper air storage cylinder 51 corresponding to the position below the sealing inner ring platform 56. A first flow passage 58 which is wide at the top and narrow at the bottom is provided in the center of the valve seat 53. A tubular valve stem 54 is sleeved on the inner side of the upper part of the valve seat 53. A plurality of second flow passages 59 which are connected inside and outside are evenly distributed along the circumference on the outer side of the upper part of the valve stem 54. A valve core 55 is fixedly installed on the upper end of the valve stem 54. The valve core 55 is conical with a small top and a large bottom. A compression spring 57 which can make the outer side of the upper part of the valve core 55 and the inner side of the lower part of the switch hole 5 be in sealing contact is provided on the inner side of the valve stem 54. A first step 60 is provided on the outer side of the upper part of the lower air storage cylinder 52. A second step 61 is provided on the inner side of the knob 6 corresponding to the position above the first step 60. The second elastic reset member 10 is installed between the first step 60 and the second step 61.

[0078] According to the requirements, the second elastic return member 10 is an existing well-known compression spring. Two groups of internal air outlet holes 20 are provided at upper and lower intervals on the outer side of the lower part of the lower air cylinder 52. The outer side of the knob 6 corresponding to the position of the second step 61 has a conical transition surface with a small upper part and a large lower part. The lower end of the lower air cylinder 52 is fixed with a sliding rod mounted in the lower connecting tube. During use, the gas storage tank includes an upper gas storage cylinder 51 and a lower gas storage cylinder 52 fixed together, which is convenient for the installation of the one-way valve and subsequent maintenance. A valve seat 53 is screwed into the upper gas storage cylinder 51 corresponding to the position below the inner ring platform 56 of the isolation. By rotating the valve seat 53, the compression amount of the compression spring 57 can be adjusted, thereby adjusting the opening pressure of the switch hole 5. When the charging pressure in the air inlet chamber 3 is greater than the elastic force of the compression spring 57, the switch hole 5 is opened, and energy can be charged into the air storage chamber 4. The setting of the first step 60 and the second step 61 facilitates the installation of the second elastic reset member 10, and can increase the force-bearing area of ​​the second elastic reset member 10, thereby improving the stability of the knob 6 during the up and down movement.

[0079] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figures 1 to 8As shown in Figures 13, 16 and 17, a first inner ring platform 62 and a second inner ring platform 63 are provided at intervals on the upper and lower sides of the inner side of the upper end of the guide sleeve 35. A plurality of inner and outer connected fixing grooves 64 are evenly distributed along the circumference of the upper end of the guide sleeve 35. The lower end of each fixing groove 64 is located below the upper end of the second inner ring platform 63. A fan-shaped fixing block 65 fixedly installed on the inner side of the lower part of the outer cylinder 1 is provided in each fixing groove 64. The inner diameter of the fixing block 65 is the same as the inner diameter of the second inner ring platform 63. The fourth elastic reset member 33 is provided between the upper end of the fixing block 65 and the lower end of the first inner ring platform 62.

[0080] According to the requirements, a fixing plate is fixedly installed on the inner side of the lower end of the fixing block 65, and a sealing rod of the lower outer sealing sleeve mounted in the lower connecting sleeve 32 is fixedly installed at the center of the lower end of the fixing plate. During use, a first inner ring platform 62 and a second inner ring platform 63 are provided at intervals on the upper and lower sides of the inner side of the upper end of the guide sleeve 35. A plurality of fixing grooves 64 that are connected inside and outside are evenly distributed along the circumference of the upper end of the guide sleeve 35, so that the guide sleeve 35 becomes a multi-petal structure. Through such an arrangement, it is convenient to install the fourth elastic reset member 33 between the guide sleeve 35 and the outer cylinder 1. After the knob 6 moves downward, it can squeeze the upper end of the guide sleeve 35. The outer cylinder 1 is fixed in the sleeve under the action of the upper telescopic assembly and the lower telescopic assembly. In this way, when the position of the outer cylinder 1 remains unchanged, the outer cylinder 1 can also maintain its position unchanged under the action of the upper pipe string. After the knob 6 moves downward, it squeezes the upper end of the guide sleeve 35. The guide sleeve 35 squeezes the fourth elastic reset member 33. The fourth elastic reset member 33 stores energy after being compressed, which facilitates the reset of the fourth elastic reset member 33 when the air storage chamber 4 is charged, so that the inner air inlet 13 and the outer air inlet 12 are connected.

[0081] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in , 3, 5, and 14, the lower part of the charging tube 2 is a Rafale nozzle structure.

[0082] During use, the tail of the charging tube 2 adopts a Rafale nozzle design. The Rafale nozzle is an asymmetric hourglass-shaped tube that contracts in the middle. It can change the gas injection speed, increase the pressure generated by the gas, and ensure that the button 7 can move axially.

[0083] The above technical features respectively constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A concentrated energy fracturing tool, characterized in that The gas cylinder comprises an outer cylinder, a charging tube, an air storage tank, a telescopic sealing assembly and a switching assembly. The charging tube is fixedly installed on the inner side of the upper end of the outer cylinder, and the air storage tank is installed in the outer cylinder corresponding to the position below the charging tube. A closed air inlet cavity and a closed air storage cavity are arranged at upper and lower intervals in the air storage tank. A switch hole is arranged in the middle of the air storage tank, and the upper end of the switch hole is connected with the lower part of the air inlet cavity. The lower end of the switch hole is connected with the upper part of the air storage cavity. A one-way valve capable of opening and closing the switch hole is arranged in the air storage cavity. A telescopic sealing assembly capable of radially contracting is arranged at the upper and lower parts of the outer cylinder, and a switching assembly is arranged between the outer side of the air storage tank and the inner side of the outer cylinder. An outer air inlet channel connected with the lower part of the charging tube is arranged on the upper part of the switching assembly, and an inner air inlet channel connected with the air inlet cavity is arranged on the outer side of the upper part of the air storage tank. An inner air outlet channel connected to the air storage chamber is provided on the outer side of the lower part of the tank, and an outer air outlet channel connected to the inner and outer sides is provided on the outer side of the lower part of the outer tube. After the pressurized medium is introduced into the charging tube, the switching assembly can make the air storage tank be in a charging state or a discharging state. When the air storage tank is in the charging state, the outer air inlet channel and the inner air inlet channel, the inner air outlet channel and the outer air outlet channel are not connected to each other, the one-way valve is opened, the air inlet chamber and the air storage chamber are connected to each other, and the telescopic sealing assembly can retract inward; when the air storage tank is in the discharging state, the outer air inlet channel and the inner air inlet channel are not connected to each other, the one-way valve is closed, the air inlet chamber and the air storage chamber are not connected to each other, the inner air outlet channel and the outer air outlet channel are connected to each other, and the telescopic sealing assembly extends outward and can be in sealing contact with the well wall.

2. The energy-concentrated fracturing tool according to claim 1, characterized in that The switching assembly includes a knob, a button, a rotating cylinder, a first elastic reset mechanism and a second elastic reset mechanism. A limited inner ring is fixed on the inner side of the upper part of the outer cylinder corresponding to the position of the air inlet cavity. A knob with a tubular structure is sleeved between the outer side of the gas storage tank and the inner side of the outer cylinder. A button with an upper end located below the charging tube is sleeved on the outer side of the upper part of the knob. The button is a tubular structure with an open lower end and a closed upper end. The outer air inlet channel includes at least one outer air inlet hole uniformly distributed along the circumference on the outer side of the upper part of the button. The inner air inlet channel includes one-to-one corresponding to the outer air inlet holes and arranged at The inner air inlet hole on the outer side of the upper part of the gas storage tank corresponds to the outer side of the knob at the lower end of the limit inner ring stage, and a rotating cylinder with a tubular structure is axially slidably installed. The outer side of the lower part of the rotating cylinder is evenly spaced along the circumference with at least two long grooves with openings at the lower ends. The lower end of the rotating cylinder between each two adjacent long grooves is provided with a short groove connected inside and outside, and the upper end of the short groove is located below the upper end of the long groove. A lower ratchet with the tooth tip downward is formed between each two adjacent long grooves and short grooves. A positioning block fixedly installed with the outer side of the knob is provided in each long groove, and the corresponding positioning block is provided on the upper The lower end of the button in the square position is provided with a plurality of upper ratchet teeth in a V shape with an opening upward along the circumference, a first elastic reset mechanism is provided between the upper end of the gas storage tank and the inner side of the upper part of the button, a second elastic reset mechanism is provided between the outer side of the lower part of the gas storage tank and the inner side of the lower part of the knob, the outgoing air passage includes at least one outgoing air hole provided at intervals along the circumference on the outer side of the lower part of the outer cylinder, the inner air outlet passage includes inner air outlet holes corresponding to the outgoing air holes and provided on the outer side of the lower part of the gas storage tank, a transition air inlet hole corresponding to the inner air inlet hole is provided on the outer side of the upper part of the knob, and the lower part of the knob is provided with a transition air inlet hole corresponding to the inner air inlet hole. A transition air outlet hole corresponding to the inner air outlet hole is provided on the outer side of the part. When the gas storage tank is in a charging state, the positioning block moves from the long slot to the short slot at an adjacent position, and the outer air inlet hole, the transition air inlet hole and the inner air inlet hole correspond to each other and are interconnected, and the inner air outlet hole, the transition air outlet hole and the outer air outlet hole are not connected to each other. When the gas storage tank is in a de-energized state, the positioning block moves from the short slot to the long slot at an adjacent position, and the inner air outlet hole, the transition air outlet hole and the outer air outlet hole correspond to each other and are interconnected, and the outer air inlet hole, the transition air inlet hole and the inner air inlet hole are not connected to each other.

3. The energy-concentrated fracturing tool according to claim 1, characterized in that The telescopic sealing assembly includes an upper telescopic component and a lower telescopic component. The upper telescopic component includes an upper mounting tube, an upper connecting sleeve, a third elastic reset member and an upper sealing piece. An upper mounting tube sleeved on the outside of the charging tube is fixedly mounted on the upper end of the outer tube. A lower supporting plate is fixedly mounted between the inner side of the lower part of the upper mounting tube and the outer side of the lower end of the charging tube. An upper supporting plate sleeved on the outer side of the charging tube is fixedly mounted on the inner side of the upper part of the upper mounting tube corresponding to the position above the lower supporting plate. An upper connecting sleeve sealingly sleeved on the outer side of the charging tube is provided on the inner side of the upper supporting plate. A first baffle is fixedly mounted on the outer side of the lower end of the upper connecting sleeve corresponding to the position between the upper supporting plate and the lower supporting plate. A plurality of first guide holes penetrating up and down are evenly distributed along the circumference of the upper end of the lower supporting plate. The upper end of the button at each first guide hole position is provided with a second guide hole that passes through the upper and lower parts, and each first guide hole is provided with a support bar whose lower side passes through the second guide hole at the corresponding position and then abuts against the upper end of the knob, and the upper side of each support bar is fixedly installed with the corresponding position of the lower side of the first baffle plate, and a third elastic reset member sleeved on the outer side of the upper connecting sleeve is provided between the lower side of the upper supporting plate and the upper side of the first baffle plate, and an upper supporting boss is fixed to the outer side of the upper part of the upper connecting sleeve corresponding to the upper position of the upper supporting plate, and an upper sealing piece whose inner side contacts the upper supporting boss is radially slidably installed on the upper part of the upper mounting tube, and the upper supporting boss moves downward when the positioning block moves from the long slot to the short slot, and is staggered with the upper sealing piece; The lower telescopic assembly includes a lower mounting tube, a lower connecting sleeve, a fourth elastic reset piece and a lower sealing piece. The lower end of the outer tube is fixedly mounted with a lower mounting tube, the lower mounting tube is sleeved with a lower connecting sleeve, the outer side of the upper end of the lower connecting sleeve is fixedly mounted with a second baffle, a guide sleeve is sleeved between the outer side of the lower part of the gas tank and the inner side of the outer tube, the lower end of the guide sleeve is fixedly mounted with the upper side of the second baffle, a fourth elastic reset piece is provided between the outer side of the guide sleeve and the inner side of the lower part of the outer tube, a lower supporting boss is fixedly mounted on the outer side of the lower connecting sleeve, and a lower sealing piece is radially slidably mounted on the lower part of the lower mounting tube, the lower supporting boss moves downward when the positioning block moves from the long slot to the short slot and is staggered with the lower separating piece.

4. The energy-concentrated fracturing tool according to claim 3, characterized in that The upper sealing piece includes a first upper sealing plate and a first lower sealing plate. An upper end cover is arranged above the upper mounting tube. The upper end cover is a cylindrical structure with an upper end closed and a lower end open. An upper mounting hole is arranged in the center of the upper end of the upper end cover, and the upper outer side of the charging tube is sealed and sleeved in the upper mounting hole. A plurality of first upper guide blocks are distributed along the circumference at intervals at the lower end of the upper end cover. The upper end of the upper mounting tube corresponding to the position between two adjacent first upper guide blocks is fixed with a first lower guide block. A fan-shaped first upper sealing plate is slidably installed at the lower end of the upper end cover between each two adjacent first upper guide blocks. A fan-shaped first lower baffle plate is slidably installed on the upper end of the upper mounting tube, the upper side of each first lower baffle plate contacts with the lower side of the first upper baffle plate at the adjacent position, the inner side of each first upper baffle plate and the inner side of each first lower baffle plate contact with the outer side of the upper supporting boss, the upper side of each first upper baffle plate and the upper side of each first lower baffle plate are provided with an upper strip sliding hole which passes through from top to bottom, an upper fixing rod is passed through each upper strip sliding hole, the upper side of each upper fixing rod is fixedly installed with the corresponding position of the lower end of the upper end cover, and the lower side of each upper fixing rod is fixedly installed with the corresponding position of the upper side of the upper support plate.

5. The energy-concentrated fracturing tool according to claim 3 or 4, characterized in that The lower sealing piece includes a second upper sealing plate and a second lower sealing plate. A lower end cover is arranged under the lower mounting tube. The lower end cover is a cylindrical structure with an open upper end and a closed lower end. A lower mounting hole is arranged in the center of the lower end of the lower end cover, and the outer side of the lower part of the lower supporting boss is sleeved in the lower mounting hole. A plurality of second lower guide blocks are distributed along the circumference at intervals on the upper end of the lower end cover. A second upper guide block is fixed to the lower end of the lower mounting tube between two adjacent second lower guide blocks. A fan-shaped second upper sealing plate is slidably installed on the lower end of the lower mounting tube between each two adjacent second upper guide blocks. A fan-shaped second upper sealing plate is slidably installed on the upper end of the lower end cover between each two adjacent second lower guide blocks. Two lower baffle plates, the upper side of each second lower baffle plate contacts with the lower side of the second upper baffle plate at the adjacent position, the inner side of each second upper baffle plate and the inner side of each second lower baffle plate contact with the outer side of the upper part of the lower supporting boss, the upper side of each second upper baffle plate and the upper side of each second lower baffle plate are provided with a lower strip sliding hole that passes through from top to bottom, the upper side of the second baffle plate corresponding to each lower strip sliding hole position is provided with a through hole that passes through from top to bottom, a lower fixing rod is passed through each lower strip sliding hole, the upper side of each lower fixing rod is fixedly installed with the corresponding position of the lower end of the gas storage tank after passing through the corresponding through hole, and the lower side of each lower fixing rod is fixedly installed with the corresponding position of the lower end cover.

6. The energy-concentrated fracturing tool according to claim 5, characterized in that The gas storage tank includes an upper gas cylinder and a lower gas cylinder fixedly installed together. Both the upper gas cylinder and the lower gas cylinder are cylindrical structures. A sealing inner ring platform is fixedly installed on the inner side of the upper part of the upper gas cylinder. The upper end of the sealing inner ring platform and the inner side of the upper part of the upper gas cylinder form an air intake cavity. The inner air intake holes are arranged at intervals along the circumference on the outer side of the upper gas cylinder above the sealing inner ring platform. The lower end of the sealing inner ring platform and the inner side of the lower part of the upper gas cylinder and the inner side of the lower gas cylinder form an air storage cavity. The inner air outlet holes are arranged at intervals along the circumference on the outer side of the lower part of the lower gas cylinder. The upper side of each lower fixed rod passes through the corresponding penetration hole and is fixedly installed with the lower end of the lower gas cylinder. A switch hole that runs through from top to bottom is arranged in the center of the sealing inner ring platform. The one-way valve includes a valve seat, a valve Rod, valve core and compression spring, a valve seat is threadedly connected in the upper air storage cylinder corresponding to the position below the isolation inner ring platform, a first flow channel which is wide at the top and narrow at the bottom is provided in the center of the valve seat, a valve stem of a tubular structure is mounted on the inner side of the upper part of the valve seat, a number of second flow channels which are connected inside and outside are evenly distributed along the circumference on the outer side of the upper part of the valve stem, a valve core is fixedly installed on the upper end of the valve stem, the valve core is a cone with a small top and a large bottom, a compression spring which can make the outer side of the upper part of the valve core and the inner side of the lower part of the switch hole sealed is provided on the inner side of the valve stem, a first step is provided on the outer side of the upper part of the lower air storage cylinder, a second step is provided on the inner side of the knob corresponding to the position above the first step, and a second elastic reset member is installed between the first step and the second step.

7. The energy-concentrated fracturing tool according to claim 3, 4 or 6, characterized in that A first inner ring platform and a second inner ring platform are provided at intervals on the upper and lower sides of the inner side of the upper end of the guide sleeve. A plurality of inner-outer connected fixing grooves are evenly distributed along the circumference of the upper end of the guide sleeve. The lower end of each fixing groove is located below the upper end of the second inner ring platform. A fan-shaped fixing block is provided in each fixing groove and is fixedly installed together with the inner side of the lower part of the outer cylinder. The inner diameter of the fixing block is the same as the inner diameter of the second inner ring platform. A fourth elastic reset member is provided between the upper end of the fixing block and the lower end of the first inner ring platform.

8. The energy-concentrated fracturing tool according to claim 5, characterized in that A first inner ring platform and a second inner ring platform are provided at intervals on the upper and lower sides of the inner side of the upper end of the guide sleeve. A plurality of inner-outer connected fixing grooves are evenly distributed along the circumference of the upper end of the guide sleeve. The lower end of each fixing groove is located below the upper end of the second inner ring platform. A fan-shaped fixing block is provided in each fixing groove and is fixedly installed together with the inner side of the lower part of the outer cylinder. The inner diameter of the fixing block is the same as the inner diameter of the second inner ring platform. A fourth elastic reset member is provided between the upper end of the fixing block and the lower end of the first inner ring platform.

9. The energy-concentrated fracturing tool according to claim 1 or 2 or 3 or 4 or 6 or 8, characterized in that The lower part of the charging tube is a Rafale nozzle structure.

10. The energy-concentrated fracturing tool according to claim 5, characterized in that The lower part of the charging tube is a Rafale nozzle structure.

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