Fracturing device

Abstract

The utility model discloses a fracturing device which comprises a storage tank, a heater and a sealing mechanism. The heater is mounted in the pipe wall of the storage tank; a feeding pipe section and a discharging pipe section are arranged at the top of the storage tank; the sealing mechanism is movably installed at the inlet end of the discharging pipe section and comprises a movable cover plate, the movable cover plate is rotationally connected with the storage tank, and the movable cover plate can completely cover the inlet end face of the discharging pipe section; the fracturing device is further provided with a control mechanism used for controlling connection and disconnection of the interior of the discharging pipe section, and the control mechanism is installed in the feeding pipe section. The control mechanism is connected with the sealing mechanism and drives the sealing mechanism to open the inlet end of the discharging pipe section. The utility model has the beneficial effects that the sealing mechanism is designed at the inlet end of the discharge pipe section, and the control mechanism for controlling the on-off of the interior of the discharge pipe section is designed in the pipe section, so that the sealing effect is greatly improved, the sealing failure probability is reduced, and the problem of fracturing fluid leakage in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fracturing, in particular to a fracturing device. Background Art

[0002] Foam fracturing is a new type of fracturing fluid system. Due to its excellent foam stability, long life, and high viscosity, it is suitable for fracturing operations in various oil and gas wells. Internationally, low-permeability oil shale deposits are being developed through supercritical carbon dioxide fracturing. This technology effectively avoids the problems of hydraulic fracturing, such as basement damage, induced earthquakes, and environmental pollution. Due to its advantages in initiation pressure, connecting microfractures, and forming complex fracture networks, it is a waterless fracturing technology with superior fracturing effects on granite, sandstone, shale, and other rock types. Carbon dioxide foam fracturing fluid is a gas-liquid mixture. It is a mixture of liquid carbon dioxide and a water-based fracturing fluid that vaporizes under certain temperature conditions to form a stable, foamy liquid.

[0003] Fracturing equipment is primarily used to store and discharge fracturing fluid. Existing CO2 foam fracturing equipment often uses valves to control the discharge of fracturing fluid. However, after long-term use, the valve's sealing performance deteriorates, and the high-pressure gas-liquid mixture easily leaks through the valve joints. This deteriorates the mixing efficiency of the high-pressure gas-liquid mixture, making it impossible to complete the fracturing operation in the oil and gas well. Therefore, there is a need to improve existing technology. Summary of the Invention

[0004] The purpose of the utility model is to provide a fracturing device to address the deficiencies of the prior art and to solve the problem of fracturing fluid leakage in the prior art.

[0005] The technical solution adopted by the utility model is: a fracturing device, including a storage tank, a heater and a sealing mechanism;

[0006] The heater is installed in the pipe wall of the storage tank; the top of the storage tank is provided with a feed pipe section and a discharge pipe section;

[0007] The sealing mechanism is movably mounted on the inlet end of the discharge pipe section, and the sealing mechanism includes a movable cover plate, which is rotatably connected to the storage tank and can completely cover the inlet end face of the discharge pipe section;

[0008] The fracturing device is also provided with a control mechanism for controlling the on-off of the discharge pipe section, which is installed in the feed pipe section; the control mechanism is connected to the sealing mechanism and drives the sealing mechanism to open the inlet end of the discharge pipe section.

[0009] According to the above scheme, the movable cover plate is arranged on the outside of the inlet end of the discharge pipe section; a connecting hole is opened on one side of the movable cover plate; a fixing rod is provided on the inner top of the storage tank, one end of the fixing rod is adapted to the connecting hole of the movable cover plate, and the other side of the movable cover plate can be rotated up and down around the fixing rod.

[0010] According to the above solution, limiting members for the axial movement of the movable cover are respectively provided on the fixing rods on both sides of the connecting hole of the movable cover.

[0011] According to the above solution, a limiting structure for limiting the rotation angle of the movable cover is provided below the movable cover.

[0012] According to the above scheme, the limiting structure includes a fixed shell, which is hemispherical and the upper end of which is connected to the inner top of the storage tank; a through hole connecting the inner and outer areas of the fixed shell is opened on the fixed shell; the movable cover is arranged in the fixed shell.

[0013] According to the above solution, the control mechanism includes a sealing ball, a push rod and a flexible spring arranged inside the discharge pipe section, and a driving assembly that can drive the sealing ball to move axially along the discharge pipe section;

[0014] The inner upper part of the discharge pipe section extends radially inward, and the center of the extended part forms a channel connecting the inlet end and the outlet end of the discharge pipe section; the sealing ball is adapted to the lower end of the channel; the driving end of the driving assembly passes through the channel and is connected to the top of the sealing ball; a gap is left between the outer wall of the driving end of the driving assembly and the inner wall of the extended part to form a flow channel; the bottom of the sealing ball is fixedly connected to the upper end of the push rod; the flexible spring is sleeved on the push rod; the lower end of the push rod can contact the movable cover plate; the flexible spring is in a compressed state.

[0015] According to the above scheme, a guide block for guiding the push rod is provided in the discharge pipe section; the outer peripheral surface of the guide block is connected to the inner wall of the discharge pipe section, and the flexible spring is located between the guide block and the channel; the guide block is provided with a guide hole for the push rod to pass through, and a flow hole for the fluid to pass through.

[0016] According to the above scheme, the driving mechanism includes a rotating sleeve, a connecting block and a connecting rod; the outlet end of the discharge pipe section is provided with a port plate, the port plate is connected to the discharge pipe, and a discharge hole is opened on the port plate; the rotating sleeve is located between the discharge pipe section and the port plate, and the rotating sleeve is threadedly connected to the discharge pipe section and the port plate respectively; the connecting block is provided inside the rotating sleeve and is connected to the inner wall of the rotating sleeve; the connecting rod is provided in the middle of the connecting block, and a slot for connecting the flow channel is provided between the two, and the upper end of the slot is connected to the discharge hole on the port plate; the lower end of the connecting rod passes through the channel and is connected to the upper end of the sealing ball; a gap is left between the connecting rod and the channel wall to form a flow channel.

[0017] According to the above scheme, the storage tank is also provided with a closing mechanism; the closing mechanism includes a sealing cover and a rubber pad; the bottom of the rubber pad is movably connected to the flange at the top of the feed pipe section, and the top of the rubber pad is fixedly connected to the bottom of the sealing cover; the sealing cover and the rubber pad are provided with bolt holes corresponding to the positions, and the bolts pass through the bolt holes to fix the sealing cover and the rubber pad on the flange of the feed pipe section.

[0018] According to the above scheme, a discharge mechanism is connected to the port plate of the discharge pipe section; the discharge mechanism includes a discharge pipe and a flange, the pipe mouth of the discharge pipe is fixed on the port plate, and the discharge pipe is connected to the discharge hole of the port plate; the outlet end of the discharge pipe is provided with a flange for connecting to the drilling pipe; a sealing gasket is provided on the flange.

[0019] The beneficial effects of the utility model are:

[0020] 1. The utility model designs a sealing mechanism at the inlet end of the discharge pipe section. When the pressure inside the storage tank is high, the gas at the top of the tank will push the movable cover to rotate, so that the movable cover can seal the bottom of the discharge pipe section to achieve the first seal.

[0021] 2. The utility model is designed to control the internal on-off control mechanism of the discharge pipe section, and uses a sealing ball to control the sealing of the discharge pipe section to achieve a second seal.

[0022] 3. The control mechanism in the present invention can also be linked to the movable cover plate so that the movable cover plate is opened when the fracturing fluid needs to be discharged, thereby ensuring the discharge of the fracturing fluid.

[0023] 4. The design of the utility model greatly improves the sealing effect, reduces the probability of sealing failure, solves the problem of fracturing fluid leakage in the prior art, and ensures safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model.

[0025] Figure 2 This is a front cross-sectional structural diagram of this embodiment.

[0026] Figure 3 Schematic diagram of the cross-sectional structure inside the fixed block in this embodiment.

[0027] Figure 4 Schematic diagram of the connection block structure in this embodiment.

[0028] Figure 5 Schematic diagram of the rubber pad structure in this embodiment.

[0029] In the figure: 1. Storage tank; 2. Support leg; 3. Feed pipe section; 4. Heater; 5. Sealing cover; 6. Rubber pad; 7. Bolt hole; 8. Fixed shell; 9. Fixed rod; 10. Limiting piece; 11. Movable cover; 12. Outlet pipe section; 12.1. Flow channel; 13. Guide block; 13.1. Flow hole; 14. Push rod; 15. Flexible spring; 16. Sealing ball; 17. Connecting rod; 17.1. Notch; 18. Connecting block; 19. Rotating sleeve; 20. Discharge pipe; 21. Flange; 22. Sealing pad; 23. Port plate; 23.1. Discharge hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] like Figure 1 and Figure 2 A fracturing device shown, specifically a downhole supercritical carbon dioxide foam fracturing device, includes a storage tank 1, a heater 4 and a sealing mechanism;

[0032] The heater 4 is installed in the pipe wall of the storage tank 1; the bottom of the storage tank 1 is provided with a support leg 2, and the top of the storage tank 1 is provided with a feed pipe section 3 and a discharge pipe section 12;

[0033] The sealing mechanism is movably mounted on the inlet end of the discharge pipe section 12 and is used to open or completely seal the inlet end of the discharge pipe section 12. The sealing mechanism includes a movable cover plate 11, which is rotatably connected to the storage tank 1. When the movable cover plate 11 is rotated upward to fit the discharge pipe section 12, the movable cover plate 11 completely covers the inlet end surface of the discharge pipe section 12.

[0034] The fracturing device is also provided with a control mechanism for controlling the on-off of the discharge pipe section 12 , which is installed in the feed pipe section 3 ; the control mechanism is connected to the sealing mechanism, driving the sealing mechanism to open the inlet end of the discharge pipe section 12 .

[0035] Specifically, the movable cover plate 11 is arranged on the outside of the inlet end of the discharge pipe section 12; a connecting hole is opened on one side of the movable cover plate 11; a fixing rod 9 is provided on the inner top of the storage tank 1, and one end of the fixing rod 9 is adapted to the connecting hole of the movable cover plate 11 (one end of the fixing rod 9 is inserted into the connecting hole of the movable cover plate 11), and the other side of the movable cover plate 11 can be rotated up and down around the fixing rod 9. When the movable cover plate 11 is rotated upward to fit with the discharge pipe section 12, the movable cover plate 11 can completely cover the inlet end face of the discharge pipe section 12.

[0036] Preferably, limiting members 10 for the axial movement of the movable cover plate 11 are respectively provided on the fixed rods 9 on both sides of the connecting hole of the movable cover plate 11 to limit the movable cover plate 11 so that the movable cover plate 11 only rotates around the fixed rods 9 and does not move along the axial direction of the fixed rods 9. The limiting members 10 in this embodiment are limiting rings.

[0037] In the present invention, when the internal pressure of the storage tank 1 increases to the point where the gas at the top of the tank pushes the movable cover 11 upward, causing the upper surface of the movable cover 11 to contact the inlet end face of the discharge pipe section 12. At this point, the inlet end of the discharge pipe section 12 is sealed, achieving the effect of sealing the inlet end of the discharge pipe section 12, preventing the gas-liquid mixture inside the storage tank 1 from being discharged through the discharge pipe section 12. When the movable cover 11 is rotated downward until its upper surface no longer contacts the inlet end face of the discharge pipe section 12, the inlet end of the discharge pipe section 12 is opened. In the present invention, the design of the movable cover 11 is adapted to the pressure design within the storage tank 1.

[0038] Preferably, a limiting structure is provided below the movable cover 11 to limit the rotation angle of the movable cover 11. Specifically, the limiting structure includes a fixed shell 5, which is hemispherical and connected to the inner top of the storage tank 1 at its upper end; a through hole is formed in the fixed shell 5 to connect the inner and outer areas of the fixed shell 5; and the movable cover 11 is disposed within the fixed shell 5.

[0039] In the present invention, the diameter of the fixed housing 5 can be designed based on the maximum rotation angle of the movable cover 11. The maximum rotation angle is reached when the rotating end of the movable cover 11 rotates downward until it contacts the inner wall of the fixed housing 5. The design of the fixed housing 5 limits the rotation angle of the movable cover 11, allowing it to rotate below the discharge pipe section 12. The fixed housing 5 has a through hole, allowing the fluid in the storage tank 1 to enter the fixed housing 5 through the connecting hole and be discharged through the discharge pipe section 12.

[0040] Preferably, if Figure 3 and Figure 4 As shown, the control mechanism includes a sealing ball 16, a push rod 14 and a flexible spring 15 arranged inside the discharge pipe section 12, and a driving assembly that can drive the sealing ball 16 to move axially along the discharge pipe section 12;

[0041] The inner upper part of the discharge pipe section 12 extends radially inward, and the center of the extended part forms a channel connecting the inlet end and the outlet end of the discharge pipe section 12; the sealing ball 16 is adapted to the lower end of the channel; the driving end of the driving assembly passes through the channel and is connected to the top of the sealing ball 16; a gap is left between the outer wall of the driving end of the driving assembly and the inner wall of the extended part to form a flow channel 12.1; the bottom of the sealing ball 16 is fixedly connected to the upper end of the push rod 14; the flexible spring 15 is sleeved on the push rod 14; the lower end of the push rod 14 can contact the movable cover plate 11; the flexible spring 15 is in a compressed state.

[0042] Preferably, a guide block 13 is provided in the discharge pipe section 12 for guiding the push rod 14; the outer peripheral surface of the guide block 13 is connected to the inner wall of the discharge pipe section 12, and the flexible spring 15 is located between the guide block 13 and the channel; the guide block 13 is provided with a guide hole for the push rod 14 to pass through, and a flow hole 13.1 for the fluid to pass through.

[0043] In the present invention, gas at the bottom of the inner cavity of discharge pipe section 12 moves above guide block 13, where flexible spring 15 pushes sealing ball 16 upward, blocking the passage of discharge pipe section 12 and preventing the gas-liquid mixture inside discharge pipe section 12 from being discharged. The driving end of the drive assembly drives sealing ball 16 to move up and down along the axial direction of discharge pipe section 12, causing sealing ball 16 to open or close the lower opening of the passage. Push rod 14 moves with sealing ball 16. When moving downward, push rod 14 pushes movable cover plate 11 to rotate downward, causing movable cover plate 11 to open the inlet end of discharge pipe section 12.

[0044] Preferably, the driving mechanism includes a rotating sleeve 19, a connecting block 18 and a connecting rod 17;

[0045] The outlet end of the discharge pipe section 12 is provided with a port plate 23, which is connected to the discharge pipe and has a discharge hole 23.1 on the port plate 23; the rotating sleeve 19 is located between the discharge pipe section 12 and the port plate 23, and the rotating sleeve 19 is threadedly connected to the discharge pipe section 12 and the port plate 23 respectively; the connecting block 18 is provided inside the rotating sleeve 19 and is connected to the inner wall of the rotating sleeve 19; the connecting rod 17 is provided in the middle of the connecting block 18, and a notch 17.1 for connecting the flow channel is provided between the two, and the upper end of the notch 17.1 is connected to the discharge hole 23.1 on the port plate 23; the lower end of the connecting rod 17 passes through the channel and is connected to the upper end of the sealing ball 16; a gap is left between the connecting rod 17 and the channel wall to form a flow channel.

[0046] In the present invention, the ends of the rotating sleeve 19 are threadedly connected to the discharge pipe section 12 and the port plate 23, respectively. The connecting block 18 is axially movable between the discharge pipe section 12 and the port plate 23, driving the connecting rod 17 to move axially along the channel. The design of the connecting rod 17 and the connecting block 18 allows the gas-liquid mixture inside the discharge pipe section 12 to be discharged from the top of the discharge pipe section 12.

[0047] In the utility model, the rotating sleeve 19 can drive the sealing ball 16 to move through the connecting rod 17 and the connecting block 18: when the rotating sleeve 19 is rotated to make it rotate downward along the axial direction of the discharge pipe section 12, the sealing ball 16 is synchronously driven downward by the connecting block 18 and the connecting rod 17, the sealing ball 16 is separated from the lower end of the channel, the lower end of the channel is opened, and the interior of the discharge pipe section 12 is connected; at the same time, the push rod 14 at the bottom of the sealing ball 16 pushes down the movable cover plate 11, and the movable cover plate 11 rotates downward to open the inlet end of the discharge pipe section 12, thereby releasing the sealing effect.

[0048] Preferably, the storage tank 1 is also provided with a sealing mechanism, such as Figure 5 As shown, the sealing mechanism includes a sealing cover 5 and a rubber pad 6; the bottom of the rubber pad 6 is movably connected to the flange at the top of the feed pipe section 3, and the top of the rubber pad 6 is fixedly connected to the bottom of the sealing cover 5; the sealing cover 5 and the rubber pad 6 are provided with corresponding bolt holes 7, and the bolts pass through the bolt holes 7 to fix the sealing cover 5 and the rubber pad 6 on the flange of the feed pipe section 3, thereby sealing the feed pipe section 3 and allowing the interior of the storage tank 1 to maintain a high pressure state.

[0049] like Figure 3 As shown, a discharge mechanism is connected to the port plate 23 of the discharge pipe section 12. The discharge mechanism comprises a discharge pipe 20 and a flange 21. The outlet of the discharge pipe 20 is fixed to the port plate 23 and communicates with a discharge hole 23.1 in the port plate 23. The outlet end of the discharge pipe 20 is provided with a flange 21 for connection to the drilling pipe. A sealing gasket 22 is provided on the flange 21 to seal the discharge pipe 20 to the drilling pipe. The design of the discharge mechanism allows fluid within the discharge pipe section 12 to be discharged through the discharge pipe 20, thereby performing a fracturing operation.

[0050] The working principle and use process of this utility model:

[0051] First, the operator mixes liquid carbon dioxide and water-based fracturing fluid and adds them to the interior of the storage tank 1 through the feed pipe section 3, and covers the sealing cover 5 so that the feed pipe section 3 is in contact with the rubber pad; then the operator uses a bolt to pass through the bolt hole 7 and fixes the sealing cover 5 to the top of the feed pipe section 3 through the nut to seal the feed pipe section 3; then the operator starts the heater 4 to heat the gas-liquid mixture inside the storage tank 1 to increase the gas pressure inside the storage tank 1. When the pressure increases to the point where the gas at the top can push the movable cover 11, the movable cover 11 rotates upward to the discharge port. The inlet end of the pipe section 12 fits together, so that the movable cover can close the bottom (i.e., the inlet end) of the discharge pipe section 12; when the gas-liquid mixture needs to be discharged, the operator rotates the rotating sleeve 19 to move the rotating sleeve 19 downward, and moves the sealing ball 16 downward through the connecting rod 17 and the connecting block 18, thereby releasing the sealing effect of the channel; and the push rod 14 connected to the sealing ball 16 moves downward accordingly, pushing the movable cover plate 11 to rotate downward, opening the inlet end of the discharge pipe section 12, thereby allowing the high-pressure gas-liquid mixture inside the storage tank 1 to be discharged through the discharge pipe section 12 and the discharge pipe.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fracturing device, characterized in that: Includes storage tank, heater and sealing mechanism; The heater is installed in the pipe wall of the storage tank; the top of the storage tank is provided with a feed pipe section and a discharge pipe section; The sealing mechanism is movably mounted on the inlet end of the discharge pipe section, and the sealing mechanism includes a movable cover plate, which is rotatably connected to the storage tank and completely covers the inlet end face of the discharge pipe section; The fracturing device is also provided with a control mechanism for controlling the on-off of the discharge pipe section, which is installed in the feed pipe section; the control mechanism is connected to the sealing mechanism and drives the sealing mechanism to open the inlet end of the discharge pipe section.

2. The fracturing device according to claim 1, wherein: The movable cover is arranged on the outside of the inlet end of the discharge pipe section; a connecting hole is opened on one side of the movable cover; a fixing rod is provided on the inner top of the storage tank, one end of the fixing rod is adapted to the connecting hole of the movable cover, and the other side of the movable cover rotates up and down around the fixing rod.

3. The fracturing device according to claim 2, wherein: Limiting pieces for the axial movement of the movable cover are respectively arranged on the fixing rods on both sides of the movable cover connection hole.

4. The fracturing device according to claim 1, wherein: A limiting structure for limiting the rotation angle of the movable cover is provided below the movable cover.

5. The fracturing device according to claim 4, characterized in that: The limiting structure includes a fixed shell, which is hemispherical and has an upper end connected to the inner top of the storage tank; a through hole connecting the inner and outer areas of the fixed shell is opened on the fixed shell; and the movable cover is arranged in the fixed shell.

6. The fracturing device according to any one of claims 1 to 5, characterized in that: The control mechanism includes a sealing ball, a push rod and a flexible spring arranged inside the discharge pipe section, and a driving assembly that drives the sealing ball to move axially along the discharge pipe section; The inner upper part of the discharge pipe section extends radially inward, and the center of the extended part forms a channel connecting the inlet end and the outlet end of the discharge pipe section; the sealing ball is adapted to the lower end of the channel; the driving end of the driving assembly passes through the channel and is connected to the top of the sealing ball; a gap is left between the outer wall of the driving end of the driving assembly and the inner wall of the extended part to form a flow channel; the bottom of the sealing ball is fixedly connected to the upper end of the push rod; the flexible spring is sleeved on the push rod; the lower end of the push rod is in contact with the movable cover plate; the flexible spring is in a compressed state.

7. The fracturing device according to claim 6, wherein: A guide block is provided in the discharge pipe section for guiding the push rod; the outer peripheral surface of the guide block is connected to the inner wall of the discharge pipe section, and the flexible spring is located between the guide block and the channel; the guide block is provided with a guide hole for the push rod to pass through, and a flow hole for the fluid to pass through.

8. The fracturing device according to claim 6, wherein: The driving assembly includes a rotating sleeve, a connecting block and a connecting rod; a port plate is provided at the outlet end of the discharge pipe section, the port plate is connected to the discharge pipe, and a discharge hole is provided on the port plate; the rotating sleeve is located between the discharge pipe section and the port plate, and the rotating sleeve is threadedly connected to the discharge pipe section and the port plate respectively; the connecting block is provided inside the rotating sleeve and is connected to the inner wall of the rotating sleeve; the connecting rod is provided in the middle of the connecting block, and a notch for connecting the flow channel is provided between the two, and the upper end of the notch is connected to the discharge hole on the port plate; the lower end of the connecting rod passes through the channel and is connected to the upper end of the sealing ball; a gap is left between the connecting rod and the channel wall to form a flow channel.

9. The fracturing device according to claim 1, wherein: The storage tank is also provided with a closing mechanism; the closing mechanism includes a sealing cover and a rubber pad; the bottom of the rubber pad is movably connected to the flange at the top of the feed pipe section, and the top of the rubber pad is fixedly connected to the bottom of the sealing cover; the sealing cover and the rubber pad are provided with corresponding bolt holes, and the bolts pass through the bolt holes to fix the sealing cover and the rubber pad on the flange of the feed pipe section.

10. The fracturing device according to claim 1, wherein: A discharge mechanism is connected to the port plate of the discharge pipe section; the discharge mechanism includes a discharge pipe and a flange, the pipe mouth of the discharge pipe is fixed on the port plate, and the discharge pipe is connected to the discharge hole of the port plate; the outlet end of the discharge pipe is provided with a flange for connecting to the drilling pipe; a sealing gasket is provided on the flange.

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