Double-channel ball valve for intelligent sand prevention well completion

Abstract

The invention discloses a double-channel ball valve for intelligent sand control well completion, which comprises an oil cavity system, a switch positioning assembly and a sealing isolation assembly, and channel switching is realized through double-oil-cavity hydraulic drive. The oil cavity system comprises an upper oil cavity structure and a lower oil cavity structure, a sealing sleeve is locked through a combined pressure transmission mechanism of an axial deep hole and a radial small hole in combination with an elastic claw, and accurate hydraulic control is guaranteed. The built-in production channel and the annular circulation channel are dual-channel, the locking sleeve is driven to axially move through hydraulic pressurization, the linkage push rod mechanism controls the ball valve to rotate to achieve opening and closing state switching, and immovable tubular column operation is supported. A mechanical emergency operation interface is arranged, a special tool is tripped for manual intervention when hydraulic pressure fails, and the function reliability under the extreme working condition is ensured by combining the disc spring compensation sealing pressure and the back pressure piston dynamic sealing technology. The sand prevention operation efficiency of the offshore oil and gas well is improved, the sand blocking risk is reduced, and the technical advantages of operation automation, control precision, high safety redundancy and the like are achieved.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction technology, and in particular to a dual-channel ball valve for intelligent sand control well completion. Background Technology

[0002] In the context of smart oilfield construction, intelligent control and improved operational efficiency of oil and gas wells are urgent needs for oilfield development. Intelligent sand control technology enables independent deployment and retrieval of electric pumps without the need for workover rigs, allowing for sand control and filling operations without occupying the drilling rig. This improves well completion efficiency and accelerates pump inspection, representing a revolutionary technological innovation over existing well completion technologies. Intelligent sand control technology is applicable to most offshore oil wells, especially those developed using unmanned platforms and subsea production systems. Therefore, addressing the shortcomings of long lead times, high operational risks, large manual workloads, and complex procedures in offshore open-hole sand control and production operations, a dual-channel ball valve for intelligent sand control completion has been designed. This valve includes a reverse circulation channel and a production channel, enabling switching between the flow channels while the tubing remains stationary. This significantly improves operational efficiency and reduces the risk of tubing sand blockage. Summary of the Invention

[0003] To meet the needs of intelligent sand control technology, this invention provides a dual-channel ball valve for intelligent sand control well completion. The invention mainly consists of three parts: an oil chamber system, a switch positioning assembly, and a sealing and isolation assembly. The ball valve is opened and closed by pressurizing different oil chambers. Even in the event of hydraulic system failure, a special tool can be used to open and close the ball valve, thereby improving the safety of the invention's application.

[0004] The present invention is achieved by the following technical solution.

[0005] A dual-channel ball valve for intelligent sand control completion includes an outer protective cover, within which are an oil chamber system, a switch positioning assembly, and a sealing and isolation assembly;

[0006] The oil chamber system includes an oil chamber sleeve, a piston sleeve, a central connecting pipe, and a connector; the piston sleeve and the central connecting pipe are placed inside the oil chamber sleeve and the connector.

[0007] The switch positioning assembly includes a locking cylinder, a locking sleeve, a central tube, an upper limit sleeve, and a lower limit sleeve; the locking cylinder is connected to the oil chamber sleeve via a connector; the upper end of the central tube is connected to the central connecting tube via a thread, and the upper limit sleeve and the lower limit sleeve are respectively installed on the upper and lower parts of the central tube, and the locking sleeve is installed inside the locking cylinder and outside the upper limit sleeve and the lower limit sleeve;

[0008] The sealing and isolation assembly includes a limiting connecting sleeve, a connecting sleeve, a ball valve outer sleeve, an upper ball seat, an operating cylinder, a left push rod, a right push rod, and a ball valve. The ball valve outer sleeve is connected to the locking cylinder through the connecting sleeve. The upper and lower ends of the limiting connecting sleeve are respectively connected to the locking sleeve and the operating cylinder through threads. An upper ball seat is provided outside the operating cylinder. The upper end of the upper ball seat is inserted into the lower end of the connecting sleeve. A ball valve is provided below the upper ball seat. The ball valve is connected to the operating cylinder through the left push rod and the right push rod, and the ball valve is rotated under the action of the left push rod and the right push rod.

[0009] Furthermore, the sidewall of the oil chamber sleeve is provided with two axial deep holes, and the inside of the oil chamber sleeve is provided with radial small holes for pressure relief or pressure transmission, which are connected to the axial deep holes; a sealing sleeve is provided inside the oil chamber sleeve, and several grooves are provided on the outer edge of the sealing sleeve, with rubber seals provided in the grooves, which seal the pressure relief holes.

[0010] Furthermore, the sealing sleeve is locked in the groove inside the oil cavity sleeve by elastic claws on the side wall; a limiting ring is provided below the sealing sleeve inside the oil cavity sleeve.

[0011] Furthermore, the piston sleeve has sealing surfaces and rectangular grooves of different sizes at both ends of its outer edge. A rubber seal is installed in the rectangular groove, and the upper mud scraper is installed in the uppermost rectangular groove.

[0012] Furthermore, the lower end of the central tube is connected to the lower switch via a thread. The lower switch has a groove inside and a rectangular groove outside. The lower scraper baffle is installed in the outer rectangular groove.

[0013] Furthermore, the locking sleeve has elastic claws at both ends of its sidewall. The elastic claws cooperate with the upper and lower limit sleeves inside, and cooperate with the lower end of the locking cylinder and the groove at the upper end inside.

[0014] Furthermore, the ball valve has symmetrical cylindrical bosses on both sides of its outer wall. The cylindrical bosses engage with the circular holes on the support plate, and the upper end of the support plate is inserted into the lower end of the upper ball seat. The cylindrical bosses of the ball valve have track grooves on the same side. One end of the left push rod and the right push rod are hung in the track grooves of the ball valve, and the other end passes through the square hole on the outer edge of the upper ball seat and engages with the rectangular boss on the outside of the operating cylinder.

[0015] Furthermore, a lower ball seat is provided below the ball valve. The upper end surface of the lower ball seat is spherical, forming a sealing pair with the outer circle of the ball valve. The upper end surface of the lower ball seat is provided with a groove in the axial direction, and the vulcanized rubber in the groove forms a seal with the ball valve.

[0016] Furthermore, a disc spring is installed on the outside of the lower ball seat, and the lower part of the lower ball seat cooperates with the back pressure piston to form a seal.

[0017] Furthermore, the lower end of the outer cover is connected to the lower part of the lower connector, and the upper end of the lower connector has an enlarged inner diameter to cooperate with the back pressure piston to form a seal; the lower connector has an inclined through hole inside, and an axial through hole is formed on the side wall of the lower connector. The axial through hole is connected to the circulation channel formed between the outer cover, the oil cavity system, the switch positioning assembly, and the sealing isolation assembly.

[0018] This application has the following beneficial effects.

[0019] (1) The present invention realizes the opening and closing operation of the ball valve through hydraulic control, and can realize automated control by matching ground equipment, effectively reducing the intensity of work and improving work efficiency;

[0020] (2) After the hydraulic system fails, the present invention can use a special tool to open and close the ball valve without affecting normal production, thereby improving the reliability of the tool and reducing the risk of on-site operation.

[0021] (3) The present invention adopts a ball valve-ball seat curved surface sealing pair design, combined with vulcanized rubber sealing layer and mud scraper ring structure, to effectively deal with sand intrusion in the well. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is the present invention. Figure 1 Cross-sectional view along line AA;

[0024] Figure 3 This is a schematic diagram of the structure of the oil cavity sleeve of the present invention;

[0025] Figure 4 This is a schematic diagram of the sealing sleeve of the present invention;

[0026] Figure 5 This is a schematic diagram of the locking sleeve of the present invention;

[0027] Figure 6 This is a schematic diagram of the connecting sleeve of the present invention;

[0028] Figure 7 This is a side view of the ball valve of the present invention in the open state;

[0029] Figure 8 This is a top view of the ball valve of the present invention in the open state;

[0030] Figure 9 This is a side view of the ball valve of the present invention in the closed state;

[0031] Figure 10 This is a top view of the ball valve of the present invention in the closed state.

[0032] The components are as follows: 1. Upper connector; 2. Oil chamber sleeve; 3. Outer protective cover; 4. Sealing sleeve; 5. Limiting ring; 6. Piston sleeve; 7. Central connecting pipe; 8. Connector; 9. Locking cylinder; 10. Locking sleeve; 11. Central pipe; 12. Upper limit sleeve; 13. Spring; 14. Lower switch; 15. Limiting connecting sleeve; 16. Connecting sleeve; 17. Ball valve outer sleeve; 18. Upper ball seat; 19. Operating cylinder; 20. Lower scraper ring; 21. Ball valve; 22. Lower ball seat; 23. Push cylinder; 24. Disc spring spacer ring; 25. Disc spring; 26. Compensating ring; 27. Back pressure piston; 28. Lower connector; 29. ​​Pressure cap; 30. Support plate. 31. Left push rod; 32. Filter ring fixing pin; 33. Right push rod; 34. Upper sludge scraper ring; 35. Lower limit sleeve; 36. Lower sludge scraper ring; 37. Anti-rotation pin; 38. Operating sleeve fixing pin; 39. Upper sludge scraper ring; A1. Pipeline sealing joint; 2-1. Axial deep hole one; 2-2. Radial small hole one; 2-3. Radial small hole two; 2-4. Axial deep hole two; 2-5. Radial small hole three; 2-6. Radial small hole four; 4-1. Groove one; 4-2. Groove two; 4-3. Groove three; 10-1. Elastic claw one; 10-2. Elastic claw two; 16-1. Countersunk through hole; 16-2. Axial protrusion. Detailed Implementation

[0033] The present patent application will be further described below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1 As shown, a dual-channel ball valve for intelligent sand control completion includes an oil chamber system, a switch positioning assembly, and a sealing and isolation assembly. The inner channel of this invention is the production channel, and the annular channel formed by the oil chamber system, switch positioning assembly, sealing and isolation assembly, and outer protective cover 3 is the circulation channel.

[0035] The oil chamber system includes an oil chamber sleeve 2, a piston sleeve 6, a central connecting pipe 7, and a connector 8. The oil chamber sleeve 2 and the piston sleeve 6 form an upper oil chamber, and the lower part of the piston sleeve 2, the oil chamber sleeve 6, and the connector 8 form a lower oil chamber. The switch positioning assembly includes a locking cylinder 9, a locking sleeve 10, a central pipe 11, an upper limit sleeve 12, and a lower limit sleeve 35. When the upper oil chamber is pressurized, the central pipe 11 and the lower limit sleeve 35 push the locking sleeve 10 downward and lock it; when the lower oil chamber is pressurized, the central pipe 11 and the upper limit sleeve 12 push the locking sleeve 10 upward and lock it. The sealing and isolation assembly includes a limiting connecting sleeve 15, a connecting sleeve 16, an operating cylinder 19, a left push rod 31, a right push rod 33, and a ball valve 21. When the locking sleeve 10 moves downward, it drives the limiting connecting sleeve 15, the operating cylinder 19, the left push rod 31, and the right push rod 33 to move downward, and the ball valve 21 rotates and is in the open state. When the locking sleeve 10 moves upward, it drives the limiting connecting sleeve 15, the operating cylinder 19, the left push rod 31, and the right push rod 33 to move upward, and the ball valve 21 rotates and is in the closed state.

[0036] Specifically, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the oil chamber system also includes a pipeline sealing joint A1, a sealing sleeve 4, a limiting ring 5, and an upper mud scraper ring 34. The side wall of the oil chamber sleeve 2 is provided with two axial deep holes, namely axial deep hole one 2-1 and axial deep hole two 2-4. The inside of the oil chamber sleeve is provided with radial small holes one 2-2, radial small holes two 2-3, radial small holes three 2-5, and radial small holes four 2-6. Among them, axial deep hole one 2-1 and radial small hole two 2-3 communicate with each other to enter the upper oil chamber, and axial deep hole two 2-4 and radial small hole four 2-6 communicate with each other to enter the lower oil chamber. Radial small holes one 2-2 and radial small holes three 2-5 are pressure relief holes for the upper and lower oil chambers. The sealing sleeve 4 has rectangular grooves 4-1, 4-2, and 4-3 along its outer edge. Each groove contains a rubber seal. The sealing sleeve 4 is installed inside the oil cavity sleeve 2 and can simultaneously and independently seal the radial small hole 2-2 (upper cavity pressure relief hole) and the radial small hole 2-5 (lower cavity pressure relief hole). After the rubber seals are installed in grooves 4-1 and 4-2, they seal the radial small hole 2-5 (lower cavity pressure relief hole). After the rubber seals are installed in grooves 4-2 and 4-3, they seal the radial small hole 2-2 (upper cavity pressure relief hole). The sealing sleeve 4 has a groove inside and elastic claws on its sidewalls, which can be locked into the groove inside the oil cavity sleeve 2. The limiting ring 5 is threaded to the oil cavity sleeve 2, providing a downward limit for the sealing sleeve 4. The axial deep hole 2-1 and axial deep hole 2-4 on the side wall of the oil chamber sleeve 2 are threaded at the starting end and connected to the pipeline sealing joint A1.

[0037] Specifically, such as Figure 1 As shown, the piston sleeve 6 is threadedly connected to the central connecting pipe 7. The piston sleeve 6 has sealing surfaces and rectangular grooves of different sizes at both ends of its outer edge. Rubber seals are installed in the grooves. The upper mud scraper ring 34 is installed in the uppermost rectangular groove.

[0038] Specifically, such as Figure 1 , Figure 5As shown, the switch positioning assembly also includes a central connecting pipe 7, a lower switch 14, a spring 13, and a lower scraper retaining ring 36. The central pipe 11 is connected to the central connecting pipe 7 via a threaded upper end and to the lower switch 14 via a threaded lower end. The lower switch 14 has a groove inside and a rectangular groove outside, and the lower scraper retaining ring 36 is installed in the rectangular groove. A boss is provided at the middle of the outer edge of the central pipe 11. The upper limit sleeve 12 and the lower limit sleeve 35 are respectively installed at both ends of the central pipe 11 and can slide on the central pipe 11. The spring 13 is installed outside the central pipe 11, between the upper limit sleeve 12 and the lower limit sleeve 35. The locking sleeve 10 has elastic claw 10-1 and elastic claw 10-2 at both ends of its sidewall, and a thread at its lower end. When the production channel of the present invention is opened, the locking sleeve 10 moves downward until the elastic claw 2 10-2 enters the expanded diameter at the lower end of the locking cylinder 9; when the production channel of the present invention is closed, the locking sleeve 10 moves upward until the elastic claw 1 10-1 enters the groove at the upper end of the locking cylinder 9 and locks.

[0039] Specifically, such as Figure 1 , Figure 7-10 As shown, the sealing and isolation assembly also includes an upper ball seat 18, an upper scraper ring 39, a lower scraper ring 20, a lower ball seat 22, a push cylinder 23, a disc spring spacer ring 24, a disc spring 25, a compensation ring 26, a back pressure piston 27, a left push rod 31, a right push rod 33, a support plate 30, a lower connector 28, a filter ring fixing pin 32, an anti-rotation pin 37, and an operating cylinder 19 fixing pin 38. The upper end of the operating cylinder 19 is threaded and connected to the limiting connecting sleeve 15. The operating cylinder 19 has a rectangular boss on its exterior, which cooperates with the rectangular grooves on the left push rod 31 and the right push rod 33 to transmit axial load. The ball valve 21 is spherical in shape and has a through hole inside, which is the production channel of the present invention. Cylindrical bosses are provided on both symmetrical sides, and these bosses cooperate with the circular holes on the support plate 30. The cylindrical bosses of the ball valve 21 have track grooves at both ends on the same side.

[0040] Specifically, such as Figure 1 , Figure 6 As shown, the connecting sleeve 16 has threads and rectangular grooves at both ends. A countersunk through hole 16-1 is provided below the lower groove. The anti-rotation nail 37 is installed in the countersunk through hole 16-1. An axial protrusion 16-2 is provided on the lower end face of the connecting sleeve 16. The protrusion is inserted into the groove on the upper end face of the upper ball seat 18.

[0041] Specifically, such as Figure 1 , Figure 7-10As shown, the upper scraper ring 39 and the lower scraper ring 20 are fixed to the upper ball seat 18 by filter ring fixing nails 32. The support plate 30 is sleeved on the cylindrical bosses on both sides of the ball valve 21, and the upper end of the support plate 30 is inserted into the groove at the lower end of the upper ball seat 18. The operating cylinder 19 is installed inside the upper ball seat 18. One end of the left push rod 31 and the right push rod 33 are hung in the track groove of the ball valve 21, and the other end passes through the square hole on the outer edge of the upper ball seat 18 and engages with the rectangular boss on the outside of the operating cylinder 19 and is fixed by the operating sleeve fixing nails 38.

[0042] Specifically, such as Figure 1 As shown, the upper surface of the lower ball seat 22 is spherical, forming a sealing pair with the outer edge of the ball valve 21. A groove is provided axially on the upper surface of the lower ball seat 22, and the vulcanized rubber within the groove forms a seal with the ball valve 21. A disc spring 25 is mounted on the outside of the lower ball seat 22. A disc spring spacer ring 24 and a compensating ring 26 are located on both sides of the disc spring 25. The disc spring spacer ring 24 provides an upper support surface for the disc spring 25, and the compensating ring 26 provides a lower support surface for the disc spring 25, while also providing a contact friction surface for the lower connector 28. A pusher cylinder 23 is located outside the disc spring spacer ring 24, the compensating ring 26, and the disc spring 25, providing lower support for the support arm 30. The lower part of the lower ball seat 22 cooperates with the back pressure piston 27 to form a seal.

[0043] Specifically, such as Figure 1 As shown, the upper end of the lower connector 28 has an enlarged diameter inside, which cooperates with the back pressure piston 27 to form a seal; the upper end of the lower connector 28 is connected to the ball valve sleeve 17 by threads; the lower connector 28 has an inclined through hole inside; the lower end of the lower connector 28 has threads and a rectangular groove on its outer side; the groove has an axial through hole; the upper end of the axial through hole penetrates the oblique surface on the body of the lower connector 28; the lower end of the axial through hole has threads, which are connected to the pipeline sealing connector A1.

[0044] Specifically, such as Figure 1 As shown, the annular channel formed by the outer protective cover 3, the upper connector 1, the oil cavity system, the switch positioning assembly, and the sealing isolation assembly is a circulation channel, through which reverse circulation well washing can be performed.

[0045] Specifically, such as Figure 1As shown, in the event of a hydraulic system failure, an activation tool and a switching tool can be lowered to open and close the invention. By lifting the tubing, the activation tool moves the sealing sleeve 4 to the limiting step, and simultaneously, the elastic claw on the sealing sleeve 4 enters the groove inside the oil chamber sleeve 2 and locks in place. At this time, the radial small hole 2-2 and the radial small hole 2-5 are pressure-connected. If it is necessary to open the production channel of the invention, the switching tool is lifted past the depth of the invention, and then the tubing is lowered. The switching tool will engage with the groove inside the lower switch 14, causing the lower limiting sleeve 35, locking sleeve 10, limiting connecting sleeve 15, operating cylinder 19, left push rod 31, and right push rod 33 to move downward. Under the axial push of the left push rod 31 and right push rod 33, the ball valve 21 rotates along the center line of its two side bosses until the limiting connecting sleeve 15 contacts the connecting sleeve 16. The rotation of the ball valve 21 ends, the tubing continues to be lowered, and the switching tool contacts the inner conical surface of the limiting connecting sleeve 15 and undergoes extrusion deformation. When the deformation reaches a certain size, the switching tool disengages from the lower switch 14, at which point the opening operation of the production channel of the present invention is completed. If it is necessary to close the production channel of the present invention, the switching tool is slowly lifted up, and the switching tool will engage with the internal groove of the piston sleeve 6, driving the central connecting pipe 7, central pipe 11, upper limit sleeve 12, locking sleeve 10, limit connecting sleeve 15, operating cylinder 19, left push rod 31 and right push rod 33 to move upward. Under the axial pulling force of the left push rod 31 and right push rod 33, the ball valve 21 rotates along the center line of its two side bosses until the upper end face of the locking sleeve 10 contacts the lower end face of the connector 8 for limit. The rotation action of the ball valve 21 ends, the pipe column continues to be lifted up, and the switching tool contacts the internal conical surface of the limit ring 5 and undergoes extrusion deformation. When the deformation reaches a certain size, the switching tool disengages from the piston sleeve 6, at which point the closing operation of the production channel of the present invention is completed.

[0046] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A dual pass ball valve for intelligent sand control completion, characterized in that: It comprises an outer shield (3), an oil cavity system, a switch positioning assembly and a sealing isolation assembly are arranged in the outer shield (3); The oil cavity system comprises an oil cavity sleeve (2), a piston sleeve (6), a central connecting pipe (7) and a connecting head (8); the piston sleeve (6) and the central connecting pipe (7) are arranged in the oil cavity sleeve (2) and the connecting head (8); The switch positioning assembly comprises a locking cylinder (9), a locking sleeve (10), a central pipe (11), an upper limiting sleeve (12) and a lower limiting sleeve (35); the locking cylinder (9) is connected with the oil cavity sleeve (2) through the connecting head (8); the upper end of the central pipe (11) is connected with the central connecting pipe (7) through screw threads; the upper and lower parts of the central pipe (11) are respectively provided with the upper limiting sleeve (12) and the lower limiting sleeve (35); the locking sleeve (10) is arranged outside the upper limiting sleeve (12) and the lower limiting sleeve (35) in the locking cylinder (9). The sealing isolation assembly comprises a limiting connecting sleeve (15), a connecting sleeve (16), a ball valve outer sleeve (17), an upper ball seat (18), an operating cylinder (19), a left push rod (31), a right push rod (33) and a ball valve (21); the ball valve outer sleeve (17) is connected with the locking cylinder (9) through the connecting sleeve (16); the upper and lower ends of the limiting connecting sleeve (15) are respectively connected with the locking sleeve (10) and the operating cylinder (19) through screw threads; the operating cylinder (19) is provided with the upper ball seat (18) outside; the upper end of the upper ball seat (18) is inserted with the lower end of the connecting sleeve (16); the ball valve (21) is arranged below the upper ball seat (18); the ball valve (21) is connected with the operating cylinder (19) through the left push rod (31) and the right push rod (33); the ball valve (21) is rotated under the action of the left push rod (31) and the right push rod (33).

2. The dual pass ball valve for intelligent sand control completion of claim 1, wherein: The side wall of the oil cavity sleeve (2) is provided with two axial deep holes; the inside of the oil cavity sleeve (2) is provided with a radial small hole for pressure relief or pressure transmission; the radial small hole is communicated with the axial deep holes; the oil cavity sleeve (2) is provided with a sealing sleeve (4) inside; a plurality of grooves are arranged outside the sealing sleeve (4); rubber sealing elements are arranged in the grooves; the rubber sealing elements seal the pressure relief holes.

3. A dual pass ball valve for intelligent sand control completion as claimed in claim 2, wherein: The sealing sleeve (4) is locked in the groove inside the oil cavity sleeve (2) through the elastic claws on the side wall; the limiting ring (5) is arranged below the sealing sleeve (4) in the oil cavity sleeve (2).

4. The dual pass ball valve for intelligent sand control completion of claim 1, wherein: The outer edges of the piston sleeve (6) are provided with sealing surfaces with different sizes and rectangular grooves; rubber sealing elements are arranged in the rectangular grooves; the upper mud scraping baffle (34) is arranged in the uppermost rectangular groove.

5. The dual pass ball valve for intelligent sand control completion of claim 1, wherein: The lower end of the central pipe (11) is connected with the lower switch (14) through screw threads; the inside of the lower switch (14) is provided with a groove; the outside of the lower switch (14) is provided with a rectangular groove; the lower mud scraping baffle (36) is arranged in the outer rectangular groove.

6. The dual pass ball valve for intelligent sand control completion of claim 1, wherein: The side wall of the locking sleeve (10) is provided with elastic claws; the inside of the elastic claws is matched with the upper limiting sleeve (12) and the lower limiting sleeve (35); the outside of the elastic claws is matched with the lower end of the locking cylinder (9) and the groove at the upper end inside.

7. The dual pass ball valve for intelligent sand control completion of claim 1, wherein: The outer wall of the ball valve (21) is symmetrically provided with a cylindrical boss which is matched with a circular hole on the support plate (30), the upper end of the support plate (30) is inserted into the lower end of the upper ball seat (18); the cylindrical boss of the ball valve (21) is provided with a track groove on the same side, one end of the left push rod (31) and the right push rod (33) is hung in the track groove of the ball valve (21), the other end is penetrated through the square hole on the outer edge of the upper ball seat (18) and is engaged with the rectangular boss outside the operating cylinder (19).

8. The dual pass ball valve for intelligent sand control completion of claim 1, wherein: A lower ball seat (22) is arranged below the ball valve (21), the upper end surface of the lower ball seat (22) is a spherical surface which forms a sealing pair with the outer circle of the ball valve (21), the upper end surface of the lower ball seat (22) is axially provided with a groove, and the vulcanized rubber in the groove forms a seal with the ball valve (21).

9. A dual pass ball valve for intelligent sand control completion as claimed in claim 8, characterized in that: A disc spring (25) is arranged outside the lower ball seat (22), the lower part of the lower ball seat (22) is matched with the back pressure piston (27) to form a seal.

10. The dual pass ball valve for intelligent sand control completion of claim 1, wherein: The lower end of the outer shroud (3) is connected with the lower part of the lower joint (28), the upper end of the lower joint (28) is internally expanded in diameter and is matched with the back pressure piston (27) to form a seal; the lower joint (28) is internally provided with an inclined through hole, an axial through hole is formed on the side wall of the lower joint (28), and the axial through hole is communicated with the circulating channel formed between the outer shroud (3) and the oil cavity system, the switch positioning assembly and the sealing isolation assembly.

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