CN114278262B - Graded hydraulic fracturing device for shale oil exploitation construction - Google Patents
Graded hydraulic fracturing device for shale oil exploitation construction Download PDFInfo
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- CN114278262B CN114278262B CN202111485520.2A CN202111485520A CN114278262B CN 114278262 B CN114278262 B CN 114278262B CN 202111485520 A CN202111485520 A CN 202111485520A CN 114278262 B CN114278262 B CN 114278262B
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Abstract
The invention relates to a staged hydraulic fracturing device for shale oil exploitation construction, which comprises a connecting end cylinder and an injection tube, wherein a diversion cylinder is connected between the connecting end cylinder and the injection tube, a partition plate for dividing the interior of the diversion cylinder into a piston cavity and a collecting cavity is arranged in the diversion cylinder, the piston cavity is communicated with the collecting cavity through an external conduit, a sealing piston is slidably arranged in the piston cavity, through holes which are uniformly distributed along the axial direction and are communicated with the external conduit are formed in the wall of the diversion cylinder where the piston cavity is located, and fracturing agent enters the piston cavity through the connecting end cylinder, moves along with the sealing piston, enters the collecting cavity through the through holes and the external conduit, and sprays and fills cracks under the action of the injection tube. According to the invention, the flow rate of the fracturing agent is regulated through the movement of the sealing piston, the fracturing agents with different flow rates are used for jetting and filling the cracks under the action of the injection pipe, so that the injected fracturing agent is ensured to be effectively filled into the cracks deep in the stratum, and the exploitation efficiency of shale oil is effectively improved.
Description
Technical Field
The invention relates to the technical field of shale oil exploitation, in particular to a staged hydraulic fracturing device for shale oil exploitation construction.
Background
The hydraulic fracturing technology is to laminate one or several horizontal or vertical cracks with pressure and support the cracks with fracturing agent to reduce the flow resistance of oil, gas and water and to communicate the flow passage of oil, gas and water, so as to reach the effect of increasing yield and injection.
In the prior art, the fracturing agent is filled into the fracturing string to fracture the cracks, so that the cracks are filled with the fracturing agent and cannot be closed, but due to the fact that the conveying pressure of the pressure pump is limited, the fracturing agent can only enter into shallower cracks, but the deeper cracks cannot be filled with the fracturing agent, so that deep cracks are closed quickly under the condition that the fracturing agent is not filled, dense oil and dense gas around the deep cracks cannot be collected, and the shale oil exploitation construction efficiency is seriously affected.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to overcome the defects in the prior art, the invention provides a staged hydraulic fracturing device for shale oil exploitation construction, which is used for conveniently adjusting the pressure in a jet injection pipe through the change of different flow rates of fracturing agents, ensuring that the fracturing agents injected by the jet injection can be effectively filled into deep cracks of a stratum, and improving the exploitation efficiency of shale oil.
The technical scheme adopted for solving the technical problems is as follows: the staged hydraulic fracturing device for shale oil exploitation construction comprises a connecting end barrel and a jet pipe, wherein a fracturing agent for joint filling can be introduced into one end of the connecting end barrel, a diversion barrel is arranged between the connecting end barrel and the jet pipe, the front end face of the diversion barrel is in sealing connection with the connecting end barrel, and the rear end face of the diversion barrel is in sealing connection with the jet pipe; be equipped with the division board in the reposition of redundant personnel section of thick bamboo, the division board is divided into the piston chamber with reposition of redundant personnel section of thick bamboo inside, communicates through outside pipe between piston chamber and the manifold, the interior sliding of piston chamber is equipped with sealed piston, is located along the circumference equipartition and the through-hole of communicating with outside pipe on the section of thick bamboo wall of the reposition of redundant personnel section of thick bamboo that the piston chamber is located, the fracturing agent gets into the piston intracavity of reposition of redundant personnel section of thick bamboo through the link section of thick bamboo, and the fracturing agent after changing the flow along with sealed piston removes passes through in through-hole, the outside pipe gets into the manifold and sprays the packing to the crack under the injection tube effect.
Specifically, in order to realize the movement of the sealing piston, a servo motor is arranged in the connecting end cylinder, a motor shaft of the servo motor is connected with an adjusting screw in a transmission way, a nut seat is arranged at the center of the sealing piston, and the adjusting screw is in threaded connection with the nut seat to push the sealing piston to move in the piston cavity.
Further, the motor box is fixed at the center position in the connecting end cylinder through the supporting frame, the servo motor is installed in the motor box, and two end parts of the adjusting screw are respectively supported between the motor box and the isolation plate through ball bearings in a rotating mode.
Furthermore, in order to improve the moving stability of the sealing piston, the peripheral surface of the sealing piston is uniformly distributed with limiting clamping grooves extending in the axial direction, and the inner wall of the manifold is uniformly distributed with limiting guide bars in sliding fit with the limiting clamping grooves in the circumferential direction.
Specifically, the outside pipe include around the vertical pipe of piston chamber outer wall circumference equipartition, vertical pipe is connected with the arc pipe, the arc pipe other end and manifold intercommunication.
Preferably, in order to realize that the fracturing agent is sprayed at different flow rates, the through holes comprise a first through hole, a second through hole and a third through hole which are axially arranged at intervals along the diversion cylinder, and the first through hole, the second through hole and the third through hole are communicated with the vertical guide pipe.
In order to realize the staged injection of the fracturing agent, injection nozzles are axially arranged on the outer wall of the injection pipe, and a packer is arranged inside the injection pipe and between two adjacent injection nozzles.
The beneficial effects of the invention are as follows: according to the invention, the flow of the fracturing agent entering the shunt barrel is changed by moving the sealing piston, so that the fracturing agents with different flow rates enter the manifold through the through holes and the external conduit and are sprayed and filled into the cracks under the action of the injection tube, the injected fracturing agent is ensured to be effectively filled into the cracks deep in the stratum, the exploitation efficiency of shale oil is effectively improved, and the normal operation of shale oil exploitation construction is ensured.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic cross-sectional view of the present invention.
Fig. 3 is an enlarged schematic view of the structure at a in fig. 2.
Fig. 4 is a schematic structural view of the connecting end cylinder according to the present invention.
Fig. 5 is a schematic structural view of the diverter cartridge according to the present invention.
Fig. 6 is a schematic view of the structure of the sealing piston according to the present invention.
In the figure: the device comprises a 1-connecting end cylinder, a 2-split cylinder, a 3-injection tube, a 4-servo motor, a 5-adjusting screw, a 6-sealing piston, a 7-first sealing ring, a 8-second sealing ring, a 9-third sealing ring, a 101-supporting frame, a 102-motor box, a 201-isolation plate, a 202-piston cavity, a 203-manifold, a 204-vertical guide pipe, a 205-arc guide pipe, a 206-first through hole, a 207-second through hole, a 208-third through hole, a 209-limit guide bar, a 301-injection nozzle, a 302-packer, a 601-threaded end seat, a 602-limit clamping groove and 603-reinforcing rib.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
The staged hydraulic fracturing device for shale oil exploitation construction as shown in fig. 1-6 comprises a connecting end cylinder 1, wherein an oil pipe is connected to the left end of the connecting end cylinder 1 to input fracturing agent, a shunt cylinder 2 is fixedly connected to the right end of the connecting end cylinder 1 through bolts, a injection tube 3 is fixedly connected to the right end of the shunt cylinder 2 through bolts, a second sealing ring 8 is arranged between the connecting end parts of the connecting end cylinder 1 and the shunt cylinder 2, and a third sealing ring 9 is arranged between the connecting end parts of the shunt cylinder 2 and the injection tube 3. The injection nozzles 301 are axially arranged on the outer wall of the injection tube 3, and a packer 302 is arranged inside the injection tube 3 and between two adjacent injection nozzles 301.
The inside division tube 2 be equipped with the division board 201, division tube 2 inside is divided into piston chamber 202 and manifold 203 through the division board 201, is equipped with adjusting screw 5 in the piston chamber 202, the inside central point of link section of thick bamboo 1 is put and is fixed with motor case 102 through support frame 101, motor case 102 internally mounted has servo motor 4, servo motor 4's motor shaft is connected with adjusting screw 5 left end transmission, adjusting screw 5 both ends respectively through ball bearing rotation support between motor case and division board, motor case 102 is close to servo motor 4 motor shaft one side and is equipped with ball bearing matched with first sealing washer 7.
The right end of the adjusting screw 5 is provided with a sealing piston 6 which is in sliding fit with the inner wall of the piston cavity 202, the center of the sealing piston 6 is provided with a nut seat 601, and the adjusting screw 5 is in threaded connection with the nut seat 601 to push the sealing piston 6 to move between two ends of the inner wall of the piston cavity 202.
The periphery of the sealing piston 6 is circumferentially and uniformly provided with axially extending limit clamping grooves 602, the inner wall of the manifold 203 is circumferentially and uniformly provided with limit guide strips 209 which are in sliding fit with the limit clamping grooves 602, and both surfaces of the sealing piston 6 are provided with reinforcing ribs 603.
The piston cavity 202 is communicated with the manifold 203 through an external conduit, in particular, the external conduit comprises vertical conduits 204 which are circumferentially and uniformly distributed around the outer wall of the piston cavity 202, the vertical conduits 204 are connected with arc-shaped conduits 205, and the other ends of the arc-shaped conduits 205 are communicated with the manifold 203.
Through holes which are circumferentially and uniformly distributed and communicated with the vertical guide pipe 204 are formed in the wall of the split flow cylinder 2 where the piston cavity 202 is located along the axial direction, specifically, first through holes 206 which are circumferentially and uniformly distributed and communicated with the vertical guide pipe 204 are formed in the inner wall of one end of the piston cavity 202 far away from the isolation plate 201; second through holes 207 communicated with the vertical guide pipe 204 are uniformly distributed on the inner wall of the piston cavity 202 and positioned between the isolation plate 201 and the first through holes 206 in the circumferential direction; third through holes 208 communicated with the vertical guide pipe 204 are uniformly distributed on the inner wall of the piston cavity 202 and located between the isolation plate 201 and the second through holes 207 in the circumferential direction.
During operation, the servo motor 4 drives the adjusting screw 5 to rotate so as to drive the sealing piston 6 to rotate, the sealing piston 6 moves towards the direction of the isolation plate 201 along the inner wall of the piston cavity 202 under the action of the adjusting screw 5, and because the piston cavity 203 limits the sealing piston 6, when the sealing piston 6 moves between the first through hole 206 and the second through hole 207, the sealing piston 6 seals the second through hole 207 and the third through hole 208, and after the fracturing agent enters the shunt barrel 2 through the connecting end barrel 1, the fracturing agent is guided into the manifold 203 through the first through hole 206, the vertical guide pipe 204 and the arc guide pipe 205 in sequence, and the fracturing agent is ejected to fill cracks under the action of the injection pipe 3.
When the sealing piston 6 continues to move between the second through hole 207 and the third through hole 208 under the action of the adjusting screw 5, the sealing piston 6 seals the third through hole 208, and after the fracturing agent enters the shunt barrel 2 through the connecting end barrel 1, the fracturing agent is guided into the manifold 203 through the first through hole 206, the second through hole 207, the vertical conduit 204 and the arc conduit 205 in sequence, and the fracturing agent is ejected to fill cracks under the action of the injection tube 3, so that the pressure of fracturing construction operation is increased, and the flow of the ejected fracturing agent is improved.
When the sealing piston 6 continues to move to be close to the isolation plate 201 under the action of the adjusting screw 5, the fracturing agent enters the inside of the shunt barrel 2 through the connecting end barrel 1, is sequentially guided into the manifold 203 through the first through hole 206, the second through hole 207, the third through hole 208, the vertical guide pipe 204 and the arc guide pipe 205, and is sprayed out to fill the cracks under the action of the injection pipe 3, so that the pressure of fracturing construction operation and the flow of the fracturing agent injection are further increased.
According to the invention, the second through hole 207 and the third through hole 208 are sealed simultaneously and the third through hole 208 is sealed independently along with the movement of the sealing piston 6, so that the flow of the fracturing agent entering the piston cavity 202 of the shunt barrel 2 is regulated to enter the manifold 203, and the fracturing pressure is increased after the flow of the fracturing agent is increased, thereby ensuring that the injected fracturing agent is effectively filled into deep cracks of a stratum when the cracks are injected and filled under the action of the injection pipe 3, improving the exploitation efficiency of shale oil and ensuring the normal exploitation and construction of the shale oil.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (5)
1. The utility model provides a shale oil exploitation construction is with hierarchical formula hydraulic fracturing device, includes that one end can let in link section of thick bamboo (1) and injection pipe (3) of the used fracturing agent of caulking, characterized by: a split flow cylinder (2) is arranged between the connecting end cylinder (1) and the injection tube (3), the front end surface of the split flow cylinder (2) is in sealing connection with the connecting end cylinder (1), and the rear end surface is in sealing connection with the injection tube (3); the split flow cylinder (2) is internally provided with a separation plate (201), the separation plate (201) divides the inside of the split flow cylinder (2) into a piston cavity (202) and a flow collecting cavity (203), the piston cavity (202) is communicated with the flow collecting cavity (203) through an external conduit, a sealing piston (6) is slidably arranged in the piston cavity (202), the external conduit comprises vertical conduits (204) uniformly distributed around the circumferential direction of the outer wall of the piston cavity (202), the vertical conduits (204) are connected with arc-shaped conduits (205), and the other end of each arc-shaped conduit (205) is communicated with the flow collecting cavity (203);
the cylinder wall of the split cylinder (2) where the piston cavity (202) is located is provided with through holes which are circumferentially and uniformly distributed and communicated with an external conduit in the axial direction, the through holes comprise a first through hole (206), a second through hole (207) and a third through hole (208) which are axially and alternately arranged along the split cylinder (2), and the first through hole (206), the second through hole (207) and the third through hole (208) are communicated with the vertical conduit (204);
the fracturing agent enters a piston cavity (202) of the shunt cylinder (2) through the connecting end cylinder (1), the fracturing agent with the flow rate changed along with the movement of the sealing piston (6) enters the flow collecting cavity (203) through the through hole and the external conduit, and cracks are injected and filled under the action of the injection tube (3).
2. The staged hydraulic fracturing device of claim 1, wherein: the connecting end cylinder (1) in be equipped with servo motor (4), the motor shaft transmission of servo motor (4) is connected with adjusting screw (5), and sealing piston (6) center is equipped with nut seat (601), adjusting screw (5) and nut seat (601) threaded connection and promote sealing piston (6) and remove in piston chamber (202).
3. The staged hydraulic fracturing device of claim 2, wherein: the motor box (102) is fixed at the center position in the connecting end cylinder (1) through the supporting frame (101), the servo motor (4) is installed in the motor box (102), and two ends of the adjusting screw (5) are respectively rotatably supported between the motor box (102) and the isolation plate (201) through ball bearings.
4. The staged hydraulic fracturing device of claim 1, wherein: the sealing piston (6) is characterized in that limiting clamping grooves (602) extending in the axial direction are uniformly distributed in the circumferential direction of the outer circumferential surface of the sealing piston, and limiting guide bars (209) which are in sliding fit with the limiting clamping grooves (602) are uniformly distributed in the circumferential direction of the inner wall of the piston cavity (202).
5. The staged hydraulic fracturing device of claim 1, wherein: the injection nozzles (301) are axially arranged on the outer wall of the injection pipe (3), and a packer (302) is arranged inside the injection pipe (3) and between two adjacent injection nozzles (301).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111485520.2A CN114278262B (en) | 2021-12-07 | 2021-12-07 | Graded hydraulic fracturing device for shale oil exploitation construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111485520.2A CN114278262B (en) | 2021-12-07 | 2021-12-07 | Graded hydraulic fracturing device for shale oil exploitation construction |
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| Publication Number | Publication Date |
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| CN114278262A CN114278262A (en) | 2022-04-05 |
| CN114278262B true CN114278262B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111485520.2A Active CN114278262B (en) | 2021-12-07 | 2021-12-07 | Graded hydraulic fracturing device for shale oil exploitation construction |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939076A (en) * | 2014-04-23 | 2014-07-23 | 西安威盛电子仪器有限公司 | Pressure and flow regulator in fracturing construction |
| CN207268170U (en) * | 2017-10-10 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of flow control valve |
| CN112814642A (en) * | 2021-03-31 | 2021-05-18 | 中国科学院武汉岩土力学研究所 | Shaft device and method for shale horizontal well staged fracturing physical simulation experiment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2522272A (en) * | 2014-01-21 | 2015-07-22 | Tendeka As | Downhole flow control device and method |
| CA3010268C (en) * | 2016-01-20 | 2023-10-31 | Sinopec Southwest Oil & Gas Company | Device for perforating, packing and fracturing and tubing string comprising the device |
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2021
- 2021-12-07 CN CN202111485520.2A patent/CN114278262B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939076A (en) * | 2014-04-23 | 2014-07-23 | 西安威盛电子仪器有限公司 | Pressure and flow regulator in fracturing construction |
| CN207268170U (en) * | 2017-10-10 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of flow control valve |
| CN112814642A (en) * | 2021-03-31 | 2021-05-18 | 中国科学院武汉岩土力学研究所 | Shaft device and method for shale horizontal well staged fracturing physical simulation experiment |
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| CN114278262A (en) | 2022-04-05 |
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