A cross-talk preventing water distributor

Abstract

The application discloses a kind of anti-channeling water distributor, including upper joint and center tube, upper joint is screwed to center tube, upper joint and center tube outside are equipped with fixed piston, fixed piston, outer core tube, rubber cylinder seat, lower connecting sleeve and lower joint are sequentially connected by thread, upper joint outside is equipped with upper lock sleeve, upper lock sleeve, upper connecting sleeve, cone are sequentially connected by thread, outer core tube outside is sequentially equipped with upper piston, cone and rubber cylinder, center tube outside is equipped with lower piston and lower joint, center tube lower part is sequentially connected sealing sleeve and lower spare cap by thread, lower joint and sealing sleeve are connected by unsealing dowel.The anti-channeling water distributor disclosed in the application adopts sealing cavity mechanism, does not affect rubber cylinder inflation sealing stability during water injection operation, avoids the problem of early unsealing of rubber cylinder, improves water injection operation cycle efficiency, and reduces construction operation cost.

Description

Technical Field

[0001] This invention relates to the field of oilfield production tools, specifically to an anti-channeling water distribution device. Background Technology

[0002] Fixed water distribution tubing is one of the downhole tools in the stratified water injection process of oilfields. Its function is to inject high-pressure water into the designated oil layer in strict accordance with the geological plan requirements, so as to achieve balanced oil displacement, improve crude oil recovery, effectively resolve inter-layer contradictions, suppress high-pressure layer crossflow, and promote effective water absorption in low-pressure layers, thereby expanding the water-driven oil area. It is mainly used in oilfield blocks where the water injection layer is relatively stable and the water injection plan is not frequently adjusted. The size of its water nozzle (the component used to control the flow rate) is preset on the ground. After being run into the well, it does not need to be adjusted through downhole operations, and it can quantitatively and accurately inject water into the target layer. However, in practical applications, due to high injection pressure and large fluctuations in injection volume, the rubber sleeve expansion and sealing are unstable. At the same time, the creep of the tubing string can cause the water distribution tubing string to fail to seal. When the seal is verified by going down into the well with a seal tester, the rubber sleeve is unsealed, the pressure curves of the upper and lower sections are consistent, the sections are interconnected, and the stratified water injection operation fails. When this problem occurs, it is necessary to pull out the tubing string, replace the water nozzle, and go down into the well again. This not only affects the water injection operation cycle but also increases the construction operation cost. Summary of the Invention

[0003] The main objective of this invention is to provide an anti-channeling water distributor that solves the problem of channeling in the water injection sections caused by the easy unsealing of the rubber sleeves of existing fixed water distribution pipe columns.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A water distributor designed to prevent cross-contamination includes an upper connector and a central tube, characterized in that: the upper connector is threadedly connected to the central tube, and a fixed piston is fitted around both the upper connector and the central tube; the fixed piston, outer core tube, rubber sleeve seat, lower connecting sleeve, and lower connector are sequentially connected by threads; the upper connector has an upper locking tooth on its exterior, and an upper locking sleeve is fitted around it; the upper locking sleeve, upper connecting sleeve, and cone are sequentially connected by threads; the outer core tube is sequentially fitted with an upper piston, cone, and rubber sleeve; the central tube is fitted with a lower piston and lower connector, and a sealing sleeve and lower cap are sequentially connected to the lower part of the central tube by threads; The lower connector and sealing sleeve are connected by a release pin; the lower end face of the rubber sleeve seat is provided with a blind hole and a third liquid inlet hole coaxially connected to the blind hole; the blind hole is provided with a one-way seat, a one-way valve core, a spring and a pressure cap, and the one-way seat is provided with a one-way liquid inlet hole, and these components form a one-way valve mechanism; the fixed piston, central tube, upper piston, outer core tube, cone, rubber sleeve seat and one-way valve mechanism form a sealing cavity mechanism; the central tube is provided with a fixed water nozzle and a lower locking sleeve, the fixed water nozzle is fitted with a lower locking tooth, the fixed water nozzle and the lower locking sleeve are connected by a pressure pin, and the lower locking sleeve is threadedly connected to a lower spare cap.

[0006] Preferably, the upper end of the pressure cap abuts against the lower end face of the one-way seat, and its lower end abuts against the upper end face of the lower connecting sleeve; the angle of the inner inclined surface of the one-way seat matches the angle of the outer inclined surface of the one-way valve core. When under pressure, the one-way valve core can move upward to compress the spring to open the one-way liquid inlet hole. After the pressure stops, the spring pushes the one-way valve core downward to close the one-way liquid inlet hole.

[0007] Preferably, the sealing cavity mechanism is filled with hydraulic oil. When pressurized, the internal pressure of the sealing cavity mechanism increases and pushes the cone to expand and seal the rubber cylinder. After the pressure is released, the internal pressure of the sealing cavity mechanism is maintained, thereby maintaining the setting force on the rubber cylinder.

[0008] Preferably, the upper end face of the fixed water nozzle abuts against the lower end face of the central tube and is provided with axially cut slits, the slit depth is 30-35mm, and 10-14 slits are evenly distributed along the circumference. The fixed water nozzle and the central tube are sealed by a sealing ring.

[0009] Preferably, the fixed piston is provided with a first inlet hole, the outer core tube is provided with a second inlet hole, the pressure cap is provided with a fourth inlet hole, and the central tube is provided with a fifth inlet hole; the central tube is provided with a first outlet hole, the sealing sleeve is provided with a second outlet hole, and the lower connector is provided with a third outlet hole, and the three outlet holes are arranged coaxially; during water injection, the well fluid flows sequentially through the gap of the fixed water nozzle, the first outlet hole, the second outlet hole, and the third outlet hole before being injected into the formation.

[0010] Preferably, the upper connector is sealed to the fixed piston and the central tube by a sealing ring; the upper connecting sleeve is sealed to the fixed piston, the upper piston, the outer core tube, and the cone by a sealing ring; the outer core tube is sealed to the upper piston, the cone, and the rubber sleeve seat by a sealing ring; the rubber sleeve seat is sealed to the central tube and the lower connecting sleeve by a sealing ring; the lower piston is sealed to the central tube and the lower connecting sleeve by a sealing ring; the lower connector is sealed to the central tube and the lower connecting sleeve by a sealing ring; and the sealing sleeve is sealed to the central tube and the lower connector by a sealing ring.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In this invention, an anti-channeling water distributor employs a one-way valve mechanism and a sealing cavity mechanism. Through the principle of hydraulic pressurization, the setting pressure of the rubber sleeve increases, and the expansion sealing force is enhanced. After water injection and pressure cessation, the pressure inside the sealing cavity remains constant, and the expansion sealing force of the rubber sleeve is not affected by fluctuations in water injection pressure or tubing creep, thus avoiding the problem of premature unsealing of the rubber sleeve. The fixed water nozzle and the central tube are sealed by a sealing ring, providing blowout prevention during well running. The tubing will not enter the well fluid, preventing surface blowouts, and is characterized by safety and environmental friendliness. After being pressurized, the fixed water nozzle descends to a predetermined position and remains stable and secure. The fixed water nozzle is made of alloy steel, effectively reducing the impact of water jet effects on the water distributor. An unsealing and release mechanism is adopted. During unsealing, the oil in the sealing cavity is released first, and then the central tube is lifted, effectively reducing the unsealing load and preventing the safety problem of forced tubing pull-out caused by the rubber sleeve getting stuck in the well. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of an anti-channeling water distributor according to the present invention;

[0014] Figure 2 for Figure 1 Enlarged view of point A;

[0015] Figure 3 This is a side view of the rubber sleeve holder;

[0016] Figures 1-3 In the middle section: 1. Upper connector; 2. Upper locking sleeve; 3. Upper connecting sleeve; 4. Fixed piston; 401. First liquid inlet; 5. Central tube; 501. First liquid outlet; 502. Fifth liquid inlet; 6. Upper piston; 7. Outer core tube; 701. Second liquid inlet; 8. Cone; 9. Rubber sleeve; 10. Rubber sleeve seat; 1001. Third liquid inlet; 1002. Blind hole; 11. Lower connecting sleeve; 12. Lower piston; 13. Lower connector; 1301. Third liquid outlet; 14. Fixed water nozzle; 15. Lower locking sleeve; 16. Sealing sleeve; 1601. Second liquid outlet; 17. Lower spare cap; 18. Upper locking tooth; 19. Lower locking tooth; 20. Pressure fixing pin; 21. Unsealing pin; 22. One-way seat; 2201. One-way liquid inlet; 23. One-way valve core; 24. Spring; 25. Pressure cap; 2501. Fourth liquid inlet. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] like Figures 1-3 As shown, it includes an upper connector 1 and a central tube 5. The upper connector 1 is threadedly connected to the central tube 5. A fixed piston 4 is fitted around the upper connector 1 and the central tube 5. The fixed piston 4, outer core tube 7, rubber sleeve seat 10, lower connecting sleeve 11, and lower connector 13 are connected sequentially by threads. The upper connector 1 is provided with an upper locking tooth 18. An upper locking sleeve 2 is fitted around the upper connector 1. The upper locking sleeve 2, upper connecting sleeve 3, and cone 8 are connected sequentially by threads. An upper piston 6, cone 8, and rubber sleeve 9 are sequentially fitted around the outer core tube 7. A lower piston 12 and lower connector 13 are fitted around the central tube 5. A sealing sleeve 16 and a lower cap 17 are sequentially connected to the lower part of the central tube 5 by threads. The lower connector 13 and sealing sleeve 16 are connected by a release pin 21. Connection; the lower end face of the rubber sleeve seat 10 is provided with a blind hole 1002 and a third liquid inlet hole 1001 coaxially connected with the blind hole 1002; the blind hole 1002 is provided with a one-way seat 22, a one-way valve core 23, a spring 24 and a pressure cap 25, and the one-way seat 22 is provided with a one-way liquid inlet hole 2201. These components form a one-way valve mechanism; the fixed piston 4, the central tube 5, the upper piston 6, the outer core tube 7, the cone 8, the rubber sleeve seat 10 and the one-way valve mechanism form a sealing cavity mechanism; the central tube 5 is provided with a fixed water nozzle 14 and a lower locking sleeve 15, the fixed water nozzle 14 is fitted with a lower locking tooth 19, the fixed water nozzle 14 and the lower locking sleeve 15 are connected by a pressure pin 20, and the lower locking sleeve 15 is threadedly connected to a lower spare cap 17.

[0019] The upper end of the pressure cap 25 abuts against the lower end face of the one-way seat 22, and its lower end abuts against the upper end face of the lower connecting sleeve 11; the inner inclined surface of the one-way seat 22 matches the angle of the outer inclined surface of the one-way valve core 23. When under pressure, the one-way valve core 23 can move upward to compress the spring 24 to open the one-way liquid inlet 2201. After the pressure is released, the spring 24 pushes the one-way valve core 23 downward to close the one-way liquid inlet 2201.

[0020] The sealing cavity mechanism is filled with hydraulic oil. When pressurized, the internal pressure of the sealing cavity mechanism increases and pushes the cone 8 to expand and seal the rubber cylinder 9. After the pressure stops, the internal pressure of the sealing cavity mechanism is maintained, thereby maintaining the setting force on the rubber cylinder 9.

[0021] The upper end face of the fixed water nozzle 14 abuts against the lower end face of the central tube 5 and is provided with axially cut slits with a depth of 30-35mm. 10-14 slits are evenly distributed along the circumference. The fixed water nozzle 14 and the central tube 5 are sealed by a sealing ring.

[0022] The fixed piston 4 is provided with a first inlet hole 401, the outer core tube 7 is provided with a second inlet hole 701, the pressure cap 25 is provided with a fourth inlet hole 2501, and the central tube 5 is provided with a fifth inlet hole 502; the central tube 5 is provided with a first outlet hole 501, the sealing sleeve 16 is provided with a second outlet hole 1601, and the lower connector 13 is provided with a third outlet hole 1301, and the three outlet holes are arranged coaxially; when injecting water, the well fluid flows sequentially through the gap of the fixed water nozzle 14, the first outlet hole 501, the second outlet hole 1601, and the third outlet hole 1301 before being injected into the formation.

[0023] The upper connector 1 is sealed to the fixed piston 4 and the central tube 5 by a sealing ring; the upper connecting sleeve 3 is sealed to the fixed piston 4, the upper piston 6, the outer core tube 7, and the cone 8 by a sealing ring; the outer core tube 7 is sealed to the upper piston 6, the cone 8, and the rubber sleeve seat 10 by a sealing ring; the rubber sleeve seat 10 is sealed to the central tube 5 and the lower connecting sleeve 11 by a sealing ring; the lower piston 12 is sealed to the central tube 5 and the lower connecting sleeve 11 by a sealing ring; the lower connector 13 is sealed to the central tube 5 and the lower connecting sleeve 11 by a sealing ring; and the sealing sleeve 16 is sealed to the central tube 5 and the lower connector 13 by a sealing ring.

[0024] During the setting process, the surface pump truck pressurizes the tubing, and the well fluid flows into the fifth inlet 502 through the central pipe 5, pushing the lower piston 12 upward. The lower piston 12 pushes the hydraulic oil into the fourth inlet 2501 and the one-way inlet 2201. The hydraulic oil pushes the one-way valve core 23 upward, and the hydraulic oil enters the sealing cavity mechanism through the third inlet 1001. Under the action of the hydraulic boosting principle, the pressure in the sealing cavity increases, and the hydraulic oil in the sealing cavity pushes the upper piston 6 and the cone 8 downward through the first inlet 401 and the second inlet 701, which in turn drives the upper locking sleeve 2 and the upper connecting sleeve 3 downward. The cone 8 pushes the rubber sleeve 9 to expand and seal on the casing. At the same time, when the tubing is pressurized to the rated pressure, the fixed water nozzle 14 moves downward and shears the pressure-fixing pin. After pin 20 and pressure pin 20 are cut, the oil pipe pressure is released instantly. After being pressed, the fixed water nozzle 14 continues to descend to the upper end face of the lower locking sleeve 15. At this time, the fixed water nozzle 14 is fixed and the lower locking tooth 19 and the lower locking sleeve 15 are locked. At this time, the lower piston 12 moves up to the lower end face of the pressure cap 25 and will not continue to move up. The one-way valve core 23 is no longer pushed by the pressure of the hydraulic oil. The spring 24 pushes the one-way valve core 23 down to close the one-way inlet hole 2201. The one-way seat 22 and the one-way valve core 23 rely on the inclined surface for sealing. The pressure in the sealing cavity mechanism is balanced. The cone 8 continues to be pushed by the hydraulic oil of the sealing cavity mechanism, ensuring that the cone 8 will not move up. The cone 8 continues to support the rubber sleeve 9 to expand and seal on the sleeve. The setting seal is completed.

[0025] During water injection, the oilfield pipeline injects water into the oil pipe. The water flows through the oil pipe in sequence through the gap of the fixed water nozzle 14, the first liquid outlet 501, the second liquid outlet 1601, and the third liquid outlet 1301 before being injected into the formation.

[0026] During unsealing, the oil tubing string is lifted, and the upper connector 1 moves upward, driving the central tube 5, sealing sleeve 16, lower spare cap 17, fixed water nozzle 14, and lower locking sleeve 15 upward, cutting off the unsealing pin 21. After moving upward a certain distance, the sealing rings of the fixed piston 4, upper connector 1, and central tube 5 lose their sealing effect, and the hydraulic oil in the sealing cavity mechanism flows out. The pressure in the sealing cavity is released instantly, and the cone 8 loses the pressure support in the sealing cavity mechanism. The cone 8 moves upward, and the rubber sleeve 9 loses the support of the cone 8. The rubber sleeve 9 is released and retracted. The tubing string is then lifted further to bring the anti-channeling water distributor to the ground, and the unsealing is completed.

Claims

1. A water distributor with anti-channeling function, comprising an upper connector (1) and a central pipe (5), characterized in that: The upper connector (1) is threadedly connected to the center tube (5), and a fixed piston (4) is fitted around the upper connector (1) and the center tube (5); the fixed piston (4), the outer core tube (7), the rubber sleeve seat (10), the lower connecting sleeve (11), and the lower connector (13) are connected in sequence by threads; the upper connector (1) is provided with an upper locking tooth (18), and an upper locking sleeve (2) is fitted around the upper connector (1); the upper locking sleeve (2), the upper connecting sleeve (3), and the cone (8) are connected in sequence by threads; the outer core tube (7) is fitted with an upper piston (6) in sequence. The cone (8) and the rubber sleeve (9) are fitted with a lower piston (12) and a lower connector (13) on the outside of the central tube (5). The lower part of the central tube (5) is connected to the sealing sleeve (16) and the lower cap (17) by threads. The lower connector (13) and the sealing sleeve (16) are connected by a release pin (21). The lower end face of the rubber sleeve seat (10) is provided with a blind hole (1002) and a third liquid inlet hole (1001) coaxially connected with the blind hole (1002). The blind hole (1002) is provided with a one-way seat (22), a one-way valve core (23), and a spring inside. The spring (24) and the pressure cap (25), the one-way seat (22) is provided with a one-way liquid inlet hole (2201), and these components form a one-way valve mechanism; the fixed piston (4), the central tube (5), the upper piston (6), the outer core tube (7), the cone (8), the rubber sleeve seat (10) and the one-way valve mechanism form a sealing cavity mechanism; the central tube (5) is provided with a fixed water nozzle (14) and a lower locking sleeve (15) inside, the fixed water nozzle (14) is fitted with a lower locking tooth (19) outside, and the fixed water nozzle (14) and the lower locking sleeve (15) are connected by a pressure pin (20). The lower locking sleeve (15) is threaded to the lower spare cap (17); the sealing cavity mechanism is filled with hydraulic oil. When it is pressurized, the internal pressure of the sealing cavity mechanism increases and pushes the cone (8) to expand the sealing tube (9). After the pressure stops, the internal pressure of the sealing cavity mechanism is maintained, thereby maintaining the sealing force on the tube (9); the fixed piston (4) is provided with a first liquid inlet hole (401), the outer core tube (7) is provided with a second liquid inlet hole (701), the pressure cap (25) is provided with a fourth liquid inlet hole (2501), and the central tube (5) is provided with a fifth liquid inlet hole (502).

2. The anti-channeling water distributor according to claim 1, characterized in that: The upper end of the pressure cap (25) abuts against the lower end face of the one-way seat (22), and its lower end abuts against the upper end face of the lower connecting sleeve (11); the inner inclined surface of the one-way seat (22) matches the angle of the outer inclined surface of the one-way valve core (23). When under pressure, the one-way valve core (23) can move upward to compress the spring (24) to open the one-way liquid inlet (2201). After the pressure stops, the spring (24) pushes the one-way valve core (23) downward to close the one-way liquid inlet (2201).

3. The anti-channeling water distributor according to claim 1, characterized in that: The upper end face of the fixed water nozzle (14) abuts against the lower end face of the central tube (5) and is provided with an axially cut slit with a depth of 30-35mm. 10-14 slits are evenly distributed along the circumference. The fixed water nozzle (14) and the central tube (5) are sealed by a sealing ring.

4. The anti-channeling water distributor according to claim 1, characterized in that: The central tube (5) is provided with a first liquid outlet (501), the sealing sleeve (16) is provided with a second liquid outlet (1601), and the lower connector (13) is provided with a third liquid outlet (1301), and the three liquid outlets are arranged coaxially. When water is injected, the well fluid flows through the gap of the fixed water nozzle (14), the first liquid outlet (501), the second liquid outlet (1601), and the third liquid outlet (1301) in sequence before being injected into the formation.

5. The anti-channeling water distributor according to claim 1, characterized in that: The upper connector (1) is sealed with the fixed piston (4) and the central tube (5) by a sealing ring. The upper connecting sleeve (3) is sealed with the fixed piston (4), the upper piston (6), the outer core tube (7), and the cone (8) by a sealing ring. The outer core tube (7) is sealed with the upper piston (6), the cone (8), and the rubber sleeve seat (10) by a sealing ring. The rubber sleeve seat (10) is sealed with the central tube (5) and the lower connecting sleeve (11) by a sealing ring. The lower piston (12) is sealed with the central tube (5) and the lower connecting sleeve (11) by a sealing ring. The lower connector (13) is sealed with the central tube (5) and the lower connecting sleeve (11) by a sealing ring. The sealing sleeve (16) is sealed with the central tube (5) and the lower connector (13) by a sealing ring.

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