A tubular pump blowout preventer

Abstract

The utility model provides a kind of tubular pump blowout preventer belongs to the downhole operation tool technical field of petroleum industry, specifically relates to a kind of tubular pump blowout preventer.The utility model provides a blowout preventer for solving the problem that tubular oil well pump is difficult to raise and lower pipe column under the condition of pressure in well, easy to occur the problem of spouting, so that pipe column can be reliably isolated and safely raised and lowered under pressure condition, simultaneously, normal oil production operation is not affected.The utility model includes trajectory cylinder, and its characterized in that: trajectory cylinder is externally provided with connecting sleeve, trajectory cylinder surface is provided with track structure, the reversing pin that is matched with track structure is provided on connecting sleeve, track structure includes long track and short track arranged on trajectory cylinder surface, long track is connected with short track by reversing track, and reversing track includes inclined ascending part and inclined descending part;long track is connected with the lower end of inclined ascending part, the upper end of inclined ascending part is connected with the upper end of inclined descending part, and the lower end of inclined descending part is connected with the upper end of short track.

Description

Technical Field

[0001] This utility model belongs to the technical field of downhole operation tools in the petroleum industry, and specifically relates to a blowout preventer valve for a tubular pump. Background Technology

[0002] Oil pump production, with its simple structure, strong adaptability, and long service life, has become one of the most important mechanical oil production methods. However, when there is pressure in the oil well, conventional oil pumps are difficult to run. During the process of running the tubing, pump barrel, and sucker rod plug, the high-pressure energy from the formation, carrying oil and water, can be ejected from the wellhead through the pump barrel and tubing, posing challenges to operational safety and environmental protection. Conventional oil pumps also face the problem of pressure in the well during pump inspection, making it difficult to retrieve the sucker rod and plug. This prolongs the operation time, and under pressure in the well, conventional oil pumps cannot meet the requirements for blowout prevention within the tubing. Utility Model Content

[0003] The purpose of this utility model is to provide a blowout preventer for tubular pumps to solve the problem of difficulty in raising and lowering tubing strings and easy blowout when tubular oil pumps are pressurized in the well. This allows the tubing strings to be reliably sealed and safely raised and lowered under pressurized conditions, without affecting normal oil production operations.

[0004] This utility model adopts the following technical solution: It includes a track cylinder, characterized in that: a connecting sleeve is provided outside the track cylinder; a track structure is provided on the surface of the track cylinder; a reversing pin is provided on the connecting sleeve to cooperate with the track structure; the track structure includes a long track and a short track disposed on the surface of the track cylinder; the long track is connected to the short track via a reversing track; the reversing track includes an inclined rising part and an inclined descending part; the long track is connected to the lower end of the inclined rising part, the upper end of the inclined rising part is connected to the upper end of the inclined descending part, and the lower end of the inclined descending part is connected to the upper end of the short track; the long track, the reversing track, and the short track are connected sequentially and arranged cyclically on the circumference of the track cylinder surface; an inner liner is provided inside the track cylinder, a retaining ring is provided between the inner liner and the track cylinder, and a spring is provided below the retaining ring. The lower end of the spring contacts an inner plug, which is fixedly connected to the connecting sleeve. An outer cylinder is provided outside the connecting sleeve, with a lower connector at the lower end and an upper connector at the upper end. A liquid passage communicating with the lower connector is provided between the outer cylinder and the connecting sleeve. A liquid passage hole communicating with the internal space of the connecting sleeve is provided at the upper end of the outer cylinder. A liquid inlet is provided on the track cylinder. The spring force causes the track cylinder to move upward. When the reversing pin engages with the short track, the liquid inlet corresponds to the liquid passage hole, which is the open valve state. When the reversing pin engages with the long track, the liquid inlet and liquid passage are misaligned, which is the closed valve state. A liquid outlet is provided at the upper end of the track cylinder, communicating with the upper connector. The upper end of the inner liner tube communicates with the internal space of the track cylinder. A through hole communicating with the space where the spring is located is provided at the lower end of the inner liner tube.

[0005] As a preferred embodiment of this utility model, a sealing cylinder is provided between the upper end of the connecting sleeve and the outer cylinder, the upper connector is provided between the sealing cylinder and the track cylinder, and a sealing rubber cylinder is also provided between the sealing cylinder and the track cylinder on the upper and lower sides of the liquid passage hole.

[0006] As another preferred embodiment of this utility model, the lower inner surface of the connecting sleeve is configured as a stepped structure, the uppermost end of the step is provided with a reversing sleeve, the reversing pin is fixed inside the reversing sleeve, the lower part of the stepped structure is provided with a support sleeve, the upper end surface of the support sleeve forms support for the reversing sleeve, and the lower end of the support sleeve contacts the inner plug.

[0007] As a third preferred embodiment of this utility model, a sandproof cover is provided at the upper end of the inner lining tube.

[0008] The beneficial effects of this utility model are as follows: By setting a circulating track structure with long tracks, short tracks, and reversing tracks outside the track cylinder, and cooperating with the reversing pin and spring, the track cylinder can achieve stable reversing during axial movement. This allows the inlet and outlet holes to selectively correspond or misalign under different working conditions, realizing the opening and closing of the valve. At the same time, by setting up the flow channel, inlet hole, and outlet hole, the valve forms a smooth fluid passage in the open state and achieves effective isolation in the closed state, taking into account both normal fluid flow and blowout prevention requirements. In addition, by setting a sealing cylinder between the connecting sleeve and the outer cylinder, and arranging sealing rubber sleeves, inner lining tubes, and sand-proof structures at key positions, the internal fluid is effectively sealed and protected, reducing leakage and impurity entry, and improving the stability and reliability of the device during long-term operation in downhole conditions. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model when the valve is opened.

[0010] Figure 2 This is a schematic diagram of the structure of this utility model when the valve is closed.

[0011] Figure 3 This is a schematic diagram of the track structure.

[0012] Figure 4 This is a diagram showing the usage state of this utility model.

[0013] In the attached diagram, 1 is the upper connector, 2 is the track cylinder, 3 is the sealing cylinder, 4 is the outer cylinder, 5 is the sealing rubber cylinder, 6 is the retaining ring, 7 is the connecting sleeve, 8 is the reversing sleeve, 9 is the reversing pin, 10 is the support sleeve, 11 is the spring, 12 is the inner liner tube, 13 is the liquid passage hole, 14 is the liquid passage channel, 15 is the inner plug, 16 is the sand guard, 17 is the liquid outlet hole, 18 is the lower connector, 19 is the liquid inlet hole, 20 is the track structure, 21 is the long track, 22 is the short track, 23 is the reversing track, 24 is the inclined rising part, 25 is the inclined descending part, 26 is the fixed valve, 27 is the anti-blowout valve of this utility model, 28 is the tubular pump, 29 is the N80 oil pipe, and 30 is the through hole. Detailed Implementation

[0014] This utility model includes a track cylinder 2, a connecting sleeve 7 outside the track cylinder 2, and a track structure 20 on the surface of the track cylinder 2. The connecting sleeve 7 is provided with a reversing pin 9 that cooperates with the track structure 20. The track structure 20 includes a long track 21 and a short track 22 disposed on the surface of the track cylinder 2. The long track 21 is connected to the short track 22 through a reversing track 23. The reversing track 23 includes an inclined rising part 24 and an inclined falling part 25. The long track 21 is connected to the lower end of the inclined rising part 24, the upper end of the inclined rising part 24 is connected to the upper end of the inclined falling part 25, and the lower end of the inclined falling part 25 is connected to the upper end of the short track 22. The long track 21, the reversing track 23, and the short track 22 are connected in sequence and arranged cyclically on the circumference of the surface of the track cylinder 2. The track cylinder 2 is the core execution component of this utility model. Several sets of track structures 20 are evenly distributed along the circumferential direction on its outer periphery. Each set of track structures 20 consists of a long track 21, a short track 22, and a reversing track 23 connecting the two. The reversing track 23 consists of an inclined rising section 24 and an inclined descending section 25, forming a continuous loop path. A connecting sleeve 7 is fitted onto the outside of the track cylinder 2, and a reversing pin 9 is fixedly mounted on it. The reversing pin 9 can extend into the track structure 20 and move along the track. Under axial force, the track cylinder 2 moves up and down relative to the connecting sleeve 7, and the reversing pin 9 moves along a predetermined trajectory within the track. When the reversing pin 9 moves along the long track 21, the track cylinder 2 is in a stable position; when it moves to the reversing track 23, guided by the inclined rising section 24 and the inclined descending section 25, the reversing pin 9 switches tracks and enters another track, thus achieving a change in motion state. Through this track loop structure, the track cylinder 2 can automatically complete the reversing action during its up and down movement, achieving state switching without additional control structures. The reversing process is stable and reliable, providing the basic motion conditions for the opening and closing of the valve.

[0015] The trajectory cylinder 2 is equipped with an inner liner tube 12, and a retaining ring 6 is provided between the inner liner tube 12 and the trajectory cylinder 2. A spring 11 is provided below the retaining ring 6, and the lower end of the spring 11 contacts an inner plug 15, which is fixedly connected to the connecting sleeve 7. An outer cylinder 4 is provided outside the connecting sleeve 7. The lower end of the outer cylinder 4 is a lower connector 18, and the upper end of the outer cylinder 4 is an upper connector 1. A liquid passage 14 communicating with the lower connector 18 is provided between the outer cylinder 4 and the connecting sleeve 7. A liquid passage hole 13 communicating with the internal space of the connecting sleeve 7 is provided at the upper end of the outer cylinder 4. The inner liner tube 12 is coaxially arranged inside the trajectory cylinder 2, forming an annular space between the inner liner tube 12 and the trajectory cylinder 2. The retaining ring 6 is provided in this space. A spring 11 is provided below the retaining ring 6, and the lower end of the spring 11 abuts against the inner plug 15, which is fixed to the connecting sleeve 7. An outer cylinder 4 is provided outside the connecting sleeve 7. The lower end of the outer cylinder 4 forms a lower connector 18, and the upper end forms an upper connector 1. A liquid passage 14 is formed between the outer cylinder 4 and the connecting sleeve 7, and a liquid passage hole 13 communicating with the internal space of the connecting sleeve 7 is provided on the upper part of the outer cylinder 4. Under the action of the spring 11, the retaining ring 6 and the track cylinder 2 are always subjected to an upward thrust. When an external load is applied to the track cylinder 2, the track cylinder 2 can overcome the force of the spring 11 and move downward; after the load is released, the track cylinder 2 returns to its original position and moves upward under the elastic force of the spring 11. The liquid passage 14 formed inside the outer cylinder 4 is connected to the internal space when the valve is open, and the medium can enter along the lower connector 18 and flow upward. Through the cooperation of the spring 11 and the retaining ring 6, the track cylinder 2 has the ability to automatically reset, providing a power basis for the opening and closing of the valve; by setting the liquid passage 14 and the liquid passage hole 13, a stable passage is formed for the fluid in the open state, providing conditions for subsequent liquid circulation and oil production.

[0016] The track cylinder 2 is provided with a liquid inlet hole 19. The elastic force of the spring 11 causes the track cylinder 2 to move upward. When the reversing pin 9 engages with the short track 22, the liquid inlet hole 19 corresponds to the liquid passage hole 13, which is the open valve state. When the reversing pin 9 engages with the long track 21, the liquid inlet hole 19 and the liquid passage hole 13 are misaligned, which is the closed valve state. The liquid inlet hole 19 is provided on the side wall of the track cylinder 2. This liquid inlet hole 19 can form a corresponding or misaligned relationship with the liquid passage hole 13 on the outer cylinder 4 during axial movement. The position of the reversing pin 9 in different tracks determines the axial height of the track cylinder 2. When the reversing pin 9 enters the short track 22, the track cylinder 2 moves upward under the action of the spring 11, so that the liquid inlet hole 19 and the liquid passage hole 13 are at the same height position, and the fluid channel is opened. When the reversing pin 9 enters the long track 21, the track cylinder 2 is in a downward state, the liquid inlet hole 19 and the liquid passage hole 13 are axially misaligned, the fluid channel is cut off, and thus the valve is closed. By controlling the axial position of the track cylinder 2, the inlet hole 19 and the outlet hole 13 are automatically aligned or separated, thus realizing the opening and closing of the valve structurally. No additional control mechanism is required, which is highly reliable and suitable for downhole pressurized conditions.

[0017] The upper end of the trajectory cylinder 2 is provided with a liquid outlet 17 that communicates with the upper connector 1. The liquid outlet 17 is connected to the internal channel of the upper connector 1, forming an upward conveying channel. When the valve is open, fluid enters the trajectory cylinder 2 through the inlet hole 19, flows upward through the outlet hole 17, and enters the upper connector 1 and the tubing above it. This structure ensures that the fluid can be smoothly discharged upwards when the valve is open, forming a continuous and stable flow path without affecting normal oil production operations.

[0018] The upper end of the inner liner tube 12 communicates with the internal space of the trajectory cylinder 2; the lower end of the inner liner tube 12 is provided with a through hole 30 communicating with the space where the spring 11 is located. The upper end of the inner liner tube 12 communicates with the internal space of the trajectory cylinder 2, and the lower end is provided with a through hole 30, allowing the interior of the inner liner tube 12 to communicate with the cavity where the spring 11 is located. During the up-and-down movement of the trajectory cylinder 2, a communication state is formed between the internal space of the inner liner tube 12 and the cavity of the spring 11, allowing fluid or pressure to flow or balance between them. This through hole 30 structure helps to reduce the internal pressure difference, prevents pressure accumulation from affecting the normal movement of the trajectory cylinder 2, and improves the overall stability of the movement.

[0019] A sealing cylinder 3 is provided between the upper ends of the connecting sleeve 7 and the outer cylinder 4. The upper connector 1 is located between the sealing cylinder 3 and the trajectory cylinder 2. Sealing rubber sleeves 5 are also provided between the sealing cylinder 3 and the trajectory cylinder 2, located above and below the liquid passage hole 13. The sealing cylinder 3 is provided between the upper ends of the connecting sleeve 7 and the outer cylinder 4, and the upper connector 1 is located between the sealing cylinder 3 and the trajectory cylinder 2. Sealing rubber sleeves 5 are respectively provided between the sealing cylinder 3 and the trajectory cylinder 2, corresponding to the upper and lower positions of the liquid passage hole 13. During the valve opening or closing process, the sealing rubber sleeves 5 are always in contact with the outer surface of the trajectory cylinder 2, sealing and isolating the upper and lower areas of the liquid passage hole 13. Through the cooperation of multiple sealing structures, fluid leakage along unexpected paths is effectively prevented, the valve body sealing performance is improved, and long-term reliable operation under downhole conditions is guaranteed.

[0020] The lower inner surface of the connecting sleeve 7 is configured with a stepped structure. A reversing sleeve 8 is located at the top of the step, and the reversing pin 9 is fixed inside the reversing sleeve 8. A support sleeve 10 is located at the bottom of the stepped structure, with its upper surface supporting the reversing sleeve 8 and its lower end contacting the inner plug 15. The lower part of the inner cavity of the connecting sleeve 7 forms a stepped structure. The upper step houses the reversing sleeve 8, and the reversing pin 9 is fixed inside the reversing sleeve 8. The lower part of the step houses the support sleeve 10, whose upper end supports the reversing sleeve 8, and whose lower end contacts the inner plug 15. The reversing sleeve 8 maintains a stable position under the support of the support sleeve 10, and the reversing pin 9 participates in the trajectory movement along with the reversing sleeve 8, completing the reversing process within the track. This structure enhances the stability and load-bearing capacity of the reversing mechanism, reduces swaying and offset during the reversing process, and is beneficial for improving reversing accuracy and long-term operational reliability.

[0021] A sand guard 16 is provided at the upper end of the inner liner tube 12. The sand guard 16 is located at the point where the fluid enters the inner liner tube 12. Before entering the inner liner tube 12, the fluid must pass through the sand guard 16, where larger particles are blocked. The sand guard 16 reduces the entry of sand and other impurities into the internal moving structure, lowers the risk of wear, and helps ensure the long-term stable operation of the reversing mechanism.

[0022] The following describes the working process of this utility model with reference to the accompanying drawings: During downhole operation, the blowout preventer is initially closed. At this time, the reversing pin 9 is located in the long track 21 of the track cylinder 2. Under the action of the spring 11, the track cylinder 2 is moved to a lower position, so that the inlet hole 19 on the track cylinder 2 and the through hole 13 on the outer cylinder 4 are misaligned, thereby cutting off the fluid passage and preventing the pressure in the well from entering the upper tubing string.

[0023] When running tubing or maintaining blowout prevention, the trajectory cylinder 2 is maintained in the above position by the action of the spring 11. After the fluid in the well enters through the lower connector 18, it is sealed by the sealing structure and cannot enter the upper channel through the inlet hole 19, thus achieving the valve-closed state.

[0024] When the blowout preventer needs to be opened for normal operation, an axial force is applied to the tubing string, causing the track cylinder 2 to move axially relative to the connecting sleeve 7, and the reversing pin 9 moves along the track on the surface of the track cylinder 2. After the reversing pin 9 enters the reversing track 23 from the long track 21 and moves along the inclined rising part 24, it further enters the inclined falling part 25 and finally switches to the short track 22.

[0025] After the reversing pin 9 enters the short track 22, the track cylinder 2 moves upward under the elastic force of the spring 11, so that the inlet hole 19 on the track cylinder 2 corresponds to the through hole 13 on the outer cylinder 4 in axial position, thereby forming a connecting channel and the blowout preventer valve enters the open state. At this time, the fluid in the well enters through the lower connector 18, enters the interior of the track cylinder 2 through the through channel 14 and the inlet hole 19, and then flows to the upper connector 1 through the outlet hole 17 at the upper end of the track cylinder 2, realizing normal fluid flow.

[0026] In the open state, the fluid is transported upward through the channel formed by the inner liner tube 12 during its flow. The upper end of the inner liner tube 12 is connected to the internal space of the trajectory cylinder 2, and the lower end is connected to the space where the spring 11 is located through the through hole 30. This facilitates internal pressure balance and makes the movement of the trajectory cylinder 2 more stable. At the same time, the sand shield 16 set at the upper end of the inner liner tube 12 performs preliminary filtration of the medium entering the interior, reducing the entry of impurities into the moving parts.

[0027] When it is necessary to close the blowout preventer valve again, axial force is applied to the tubing string again, causing the track cylinder 2 to move downward within the connecting sleeve 7. The reversing pin 9 enters the reversing track 23 along the short track 22 and switches to the long track 21 via the inclined track. Under the action of the spring 11, the track cylinder 2 returns to the downward position, causing the inlet hole 19 and the outlet hole 13 to misalign again, thereby cutting off the fluid passage and restoring the blowout preventer valve to the closed state.

[0028] Throughout the entire operation, the sealing cylinder 3 and the sealing rubber sleeves 5 positioned above and below the fluid passage 13 effectively seal the fluid, preventing leakage along unintended paths. The reversing sleeve 8, support sleeve 10, and inner plug 15 together provide support and limit the reversing mechanism, ensuring a stable and reliable reversing process. Through the above-mentioned operation, the blowout preventer valve can be repeatedly opened and closed in downhole conditions, meeting the requirements for safe operation under pressure.

[0029] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A pipe-type pump anti-blowout valve, comprising a trajectory cylinder (2), characterized in that: A connecting sleeve (7) is provided outside the track cylinder (2), and a track structure (20) is provided on the surface of the track cylinder (2). A reversing pin (9) that cooperates with the track structure (20) is provided on the connecting sleeve (7). The track structure (20) includes a long track (21) and a short track (22) provided on the surface of the track cylinder (2). The long track (21) is connected to the short track (22) through a reversing track (23). The reversing track (23) includes an inclined rising part (24) and an inclined falling part (25). The long track (21) and the inclined rising part (24) are connected to the short track (22) through a reversing track (23). The lower end of the inclined rising part (24) is connected to the upper end of the inclined descending part (25), and the lower end of the inclined descending part (25) is connected to the upper end of the short track (22). The long track (21), the reversing track (23), and the short track (22) are connected in sequence and arranged cyclically on the circumference of the track cylinder (2). An inner liner tube (12) is provided inside the track cylinder (2), and a retaining ring (6) is provided between the inner liner tube (12) and the track cylinder (2). A spring (11) is provided below the retaining ring (6), and the lower end of the spring (11) is in contact with an inner plug (15). The inner plug (15) is fixedly connected to the connecting sleeve (7); an outer cylinder (4) is provided outside the connecting sleeve (7), the lower end of the outer cylinder (4) is a lower connector (18), and the upper end of the outer cylinder (4) is provided with an upper connector (1). A liquid passage (14) communicating with the lower connector (18) is provided between the outer cylinder (4) and the connecting sleeve (7); a liquid passage hole (13) communicating with the internal space of the connecting sleeve (7) is provided at the upper end of the outer cylinder (4); a liquid inlet hole (19) is provided on the trajectory cylinder (2), and the elastic force of the spring (11) causes the trajectory cylinder (2) to... When the reversing pin (9) is engaged with the short track (22), the liquid inlet (19) corresponds to the liquid outlet (13), which is the open valve state; when the reversing pin (9) is engaged with the long track (21), the liquid inlet (19) and the liquid outlet (13) are misaligned, which is the closed valve state; the upper end of the track cylinder (2) is provided with a liquid outlet (17) that communicates with the upper connector (1); the upper end of the inner liner tube (12) communicates with the internal space of the track cylinder (2); the lower end of the inner liner tube (12) is provided with a through hole (30) that communicates with the space where the spring (11) is located.

2. The anti-blowout valve for a tubular pump according to claim 1, characterized in that: A sealing cylinder (3) is provided between the upper end of the connecting sleeve (7) and the outer cylinder (4). The upper connector (1) is provided between the sealing cylinder (3) and the track cylinder (2). A sealing rubber cylinder (5) located on the upper and lower sides of the liquid passage hole (13) is also provided between the sealing cylinder (3) and the track cylinder (2).

3. The anti-blowout valve for a tubular pump according to claim 1, characterized in that: The lower inner surface of the connecting sleeve (7) is configured as a stepped structure, and a reversing sleeve (8) is provided at the uppermost end of the step. The reversing pin (9) is fixed inside the reversing sleeve (8). A support sleeve (10) is provided at the lower part of the stepped structure. The upper end of the support sleeve (10) forms a support for the reversing sleeve (8), and the lower end of the support sleeve (10) contacts the inner plug (15).

4. The anti-blowout valve for a tubular pump according to claim 1, characterized in that: A sand shield (16) is provided at the upper end of the inner liner tube (12).

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