Pressure difference remote control underground plugging valve capable of being connected back

Abstract

The invention belongs to the technical field of petroleum and natural gas downhole operation equipment, and discloses a tieback differential pressure remote control downhole plugging valve which comprises an outer cylinder, a shearing mandrel, an upper rupture disc and a lower rupture disc, the top end of the outer cylinder is detachably connected with a hand releasing assembly or a tieback assembly, and a ball valve assembly is arranged at the bottom end of the outer cylinder; a first boss and a second boss are arranged on the outer circle face of the shearing mandrel in a spaced mode, and the area of the upper acting face of the first boss is larger than that of the lower acting face of the second boss. After the lower rupture disk is ruptured, the annular pressure pushes the shear mandrel to move upwards, and the ball valve assembly is closed; after the upper rupture disc is ruptured, annular pressure forms pressure difference between the upper acting surface of the first boss and the lower acting surface of the second boss, the shearing mandrel moves downwards under the action of the pressure difference, and the ball valve assembly is opened. The pressure difference can be formed on the shearing mandrel through annular pressure to remotely control the shearing mandrel to move so as to open or close the ball valve assembly, and rapid layer transfer operation is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and natural gas downhole operation equipment, and in particular to a reconnectable pressure differential remote-controlled downhole plugging valve. Background Art

[0002] The existing deep and ultra-deep oil testing cycle is relatively long, of which the average layer conversion time such as well killing and interlayer plugging accounts for a large proportion. High-density well killing fluid is used during the layer conversion period, and the loss of well killing fluid can easily cause reservoir damage, affecting the oil testing timeliness and oil and gas well production capacity.

[0003] The use of plugging valves in conjunction with packers can achieve rapid layer transfer, avoid reservoir damage, improve oil testing efficiency, and accelerate the exploration process. In oil testing operations in complex high-temperature, high-pressure environments, most construction wells have more than two layers, and some wells have more than five layers. According to different formation conditions, the plugging valve needs to be resistant to high temperature and high pressure (200℃ / 105MPa), able to squeeze cement (with channels), able to be unsealed (lifted out), able to be tied back (capable of production), and have high sealing performance (taking into account the gas slippage effect). As a result, the plugging valve cannot directly perform circulating fluid replacement or well pressure operations, and needs to rely on the cooperation of other tools. This increases the complexity and cost of the operation, and may extend the operation time, affecting the overall operation efficiency and safety. Summary of the Invention

[0004] The purpose of the present invention is to provide a reconnectable pressure differential remote control downhole plugging valve, which is used for oil testing operations in high temperature and high pressure complex environments and can meet the needs of rapid layer transfer.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A reconnectable pressure differential remote control downhole plugging valve, comprising:

[0007] An outer cylinder, wherein a first bypass hole is provided on a side wall of the outer cylinder, a top end of the outer cylinder is detachably connected to a disconnect assembly or a tie-back assembly, and a bottom end of the outer cylinder is provided with the ball valve assembly;

[0008] A shearing mandrel, the shearing mandrel being fixed to the interior of the outer cylinder by a shear pin, the side wall of the shearing mandrel being provided with a second bypass hole; a first boss and a second boss being provided on the outer circumferential surface of the shearing mandrel; the area of ​​the upper active surface of the first boss (25) being larger than the area of ​​the lower active surface of the second boss (27);

[0009] a lower rupture disk, the lower rupture disk being provided on the outer cylinder to isolate the annulus from the lower working surface of the second boss; after the lower rupture disk ruptures, the annulus pressure acts on the lower working surface of the second boss and pushes the shear mandrel to move upward, the first bypass hole and the second bypass hole are connected, and the ball valve assembly is closed;

[0010] An upper rupture disk is provided on the outer cylinder to isolate the annulus and the upper working surface of the first boss. After the upper rupture disk ruptures, the annulus pressure acts on the upper working surface of the first boss. The annulus pressure forms a pressure difference between the upper working surface of the first boss and the lower working surface of the second boss. The shear spindle moves downward under the action of the pressure difference, the first bypass hole and the second bypass hole are staggered, and the ball valve assembly opens.

[0011] In some embodiments, the outer tube includes an upper outer tube, a lower outer tube and a ball valve outer tube that are connected sequentially from top to bottom and coaxially arranged, and the top end of the upper outer tube is detachably connected to the release assembly or the reconnection assembly; the ball valve assembly is arranged in the ball valve outer tube; the first bypass hole is arranged on the side wall of the upper outer tube, and the first boss and the second boss are both slidably connected to the inner wall of the lower outer tube.

[0012] In some embodiments, the inner wall of the lower outer cylinder is provided with a lower limit step. When the shearing mandrel moves, the upper and lower action surfaces of the first boss can respectively stop at the bottom end of the upper outer cylinder and the lower limit step to limit the position.

[0013] In some embodiments, the hands-off assembly includes:

[0014] Hand-off connector;

[0015] A release spindle, the top end of which is threadedly connected to the release joint, the outer wall of which is provided with a first limiting step and a first spline, and the bottom end of which is inserted into the upper outer cylinder and can slide and retract within the upper outer cylinder;

[0016] A left-hand nut is keyed to the release spindle, and the release spindle can drive the left-hand nut to rotate to connect or disconnect from the upper outer cylinder; a second spline is provided on the inner wall of the upper outer cylinder, and the first spline and the second spline can transmit torque when engaged.

[0017] In some embodiments, the tieback assembly includes:

[0018] tieback joint;

[0019] a tie-back mandrel, the top end of which is threadedly connected to the tie-back joint, and the bottom end of which is inserted into the upper outer cylinder;

[0020] A connecting claw, the connecting claw being sleeved on the connecting spindle and being threadedly connected to the upper outer cylinder;

[0021] A combined seal is sleeved on the tie-back mandrel. When the bottom end of the tie-back mandrel is inserted into the upper outer tube, the combined seal is clamped between the tie-back mandrel and the upper outer tube for sealing.

[0022] In some embodiments, a guide joint is provided at the bottom end of the tie-back spindle, and the upper and lower ends of the combined seal respectively abut against the outer wall of the tie-back spindle and the guide joint.

[0023] In some embodiments, the ball valve assembly comprises:

[0024] an elastic claw, the top end of which is inserted into the gap between the shear mandrel and the lower outer cylinder, the bottom end of which is sequentially connected to a connecting nipple and an operating pin, so that the elastic claw can be driven to move when the shear mandrel moves;

[0025] A ball seat short section connected to the ball valve outer cylinder;

[0026] The ball valve assembly is located at the top of the ball seat short section and is limited by the ball cage. The operating pin is movably connected to the ball valve assembly. When the elastic claw moves, it can drive the operating pin to move, and the operating pin drives the ball valve assembly to open or close.

[0027] In some embodiments, the outer tube further includes a lower joint, the lower joint is threadedly connected to the ball valve outer tube, and the ball seat short section is threadedly connected to the lower joint.

[0028] In some embodiments, the ball valve assembly is provided with an operating hole, and the inner wall of the operating pin is provided with an operating lug, and the operating lug is inserted into the operating hole.

[0029] In some embodiments, the top inner wall of the elastic claw is provided with a third limiting step, and the bottom outer wall of the shearing spindle is provided with a second limiting step and a fourth limiting step, and the third limiting step can be limited between the second limiting step and the fourth limiting step when moving.

[0030] Beneficial effects of the present invention:

[0031] The reconnectable pressure differential remote-controlled downhole sealing valve provided by the present invention controls the upper rupture disk and the lower rupture disk through the annular space pressure to drive the movement of the shear core shaft respectively, thereby realizing pressure differential remote control of the opening and closing of the ball valve assembly, does not rely on the cooperation of other tools, has a simple structure, and is low in cost, which is conducive to shortening the operation time and improving the efficiency and safety of layer conversion operations; by detachably connecting a release assembly or a reconnection assembly at the top of the outer cylinder, it is possible to disconnect and reconnect with the upper pipe string, thereby increasing the operational flexibility and safety of the reconnectable pressure differential remote-controlled downhole sealing valve, improving the versatility and applicability of the reconnectable pressure differential remote-controlled downhole sealing valve, and helping to improve the layer conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural diagram of a reconnectable pressure differential remote-controlled downhole plugging valve provided by an embodiment of the present invention (with a release assembly in the state after entering the well and before being released);

[0033] Figure 2 This is a structural diagram of a pressure differential remote-controlled downhole plugging valve with a reconnectable structure provided by an embodiment of the present invention (with a reconnection assembly in the state before well opening after reconnection);

[0034] Figure 3 This is a structural diagram of the power and bypass mechanisms in a reconnectable differential pressure remote-controlled downhole plugging valve provided by an embodiment of the present invention;

[0035] Figure 4 This is a structural diagram of the ball valve portion of a reconnectable pressure differential remote-controlled downhole plugging valve provided by an embodiment of the present invention;

[0036] Figure 5 This is a structural schematic diagram of the release and torque transmission parts of the reconnectable differential pressure remote control downhole plugging valve provided by an embodiment of the present invention;

[0037] Figure 6 1 is a structural schematic diagram of a tieback portion of a tieback differential remote-controlled downhole plugging valve provided by an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the state of transmitting string torque in the reconnectable differential pressure remote control downhole plugging valve provided by an embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the state of shutting in the well and opening the bypass before release in the reconnectable pressure differential remote control downhole plugging valve provided by an embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the release state of the release assembly on the reconnectable differential pressure remote control downhole plugging valve provided by an embodiment of the present invention before release;

[0041] Figure 10This is a schematic diagram of the state of the disconnectable pressure differential remote control downhole plugging valve provided by an embodiment of the present invention after the upper release assembly is released;

[0042] Figure 11 Schematic diagram of the tieback state of the tieback assembly on the tieback differential remote-controlled downhole plugging valve provided by an embodiment of the present invention;

[0043] Figure 12 The figure is a schematic diagram of the well opening state of the tieback assembly on the tieback differential remote-controlled downhole plugging valve provided by an embodiment of the present invention after tieback.

[0044] In the picture:

[0045] 1. Disconnect joint; 2. Disconnect spindle; 3. Left-hand nut; 4. Upper outer cylinder; 5. Shear spindle; 6. Lower outer cylinder; 7. Elastic claw; 8. Ball valve outer cylinder; 9. Connecting nipple; 10. Ball cage; 11. Ball valve assembly; 12. Operating pin; 13. Ball seat nipple; 14. Lower joint; 15. Tieback joint; 16. Tieback claw; 17. Tieback spindle; 18. Combined seal; 19. Guide joint; 20. A limiting step; 21. A first spline; 22. A second spline; 23. A first bypass hole; 24. A second bypass hole; 25. A first boss; 26. An outer cylindrical surface; 27. A second boss; 28. A second limiting step; 29. ​​A third limiting step; 30. An operating hole; 31. An operating lug; 32. A shear pin; 33. An upper rupture disk; 34. A lower rupture disk; 35. A fourth limiting step; 36. An upper limit position. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0047] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0050] Combine Figures 1-12 The embodiment of the present invention provides a reconnectable pressure differential remote control downhole plugging valve, comprising an outer cylinder, a shear mandrel 5, an upper rupture disk 33 and a lower rupture disk 34. The side wall of the outer cylinder is provided with a first bypass hole 23. The top end of the outer cylinder can be detachably connected to a release assembly or a reconnection assembly. The bottom end of the outer cylinder is provided with a ball valve assembly. The shear mandrel 5 is fixed to the inside of the outer cylinder by a shear pin 32. The side wall of the shear mandrel 5 is provided with a second bypass hole 24. The outer cylindrical surface 26 of the shear mandrel 5 is provided with a first boss 25 and a second boss 27 at intervals. The area of ​​the upper active surface of the first boss 25 is larger than the area of ​​the lower active surface of the second boss 27. The lower rupture disk 34 is provided on the outer cylinder to isolate the annulus and the lower active surface of the second boss 27. After the disk 34 ruptures, the annular space pressure acts on the lower working surface of the second boss 27 and pushes the shear core shaft 5 to move upward, the first bypass hole 23 and the second bypass hole 24 are connected, and the ball valve assembly is closed; the upper rupture disk 33 is arranged on the outer cylinder to isolate the annulus and the upper working surface of the first boss 25. After the upper rupture disk 33 ruptures, the annular space pressure acts on the upper working surface of the first boss 25. Since the area of ​​the upper working surface of the first boss 25 is larger than the area of ​​the lower working surface of the second boss 27, the annular space pressure forms a pressure difference between the upper working surface of the first boss 25 and the lower working surface of the second boss 27. The shear core shaft 5 moves downward under the action of the pressure difference, the first bypass hole 23 and the second bypass hole 24 are staggered, and the ball valve assembly opens.

[0051] The reconnectable pressure differential remote control downhole plugging valve provided by the present invention has an outer tube as the main supporting body, and an annulus is formed between the outer tube and the wellbore. Liquid can be injected into the annulus to pressurize and form annular pressure. By arranging a shear mandrel 5 in the outer tube and arranging an upper rupture disk 33 and a lower rupture disk 34 on the outer tube to isolate the annulus, pressure differential remote control plugging and well opening operations can be performed at a specified location. Figure 3 The upper rupture disk 33 and the lower rupture disk 34 are arranged sequentially from top to bottom. The annular pressure controls the upper rupture disk 33 and the lower rupture disk 34 to respectively drive the shear mandrel 5 downward or upward. Since the lower rupture disk 34 is arranged at the bottom and the upper rupture disk 33 is arranged at the top, during operation, the lower rupture disk 34 performs rupture and well shut-in first. Therefore, when opening the well, an area difference is required between the upper active surface of the first boss 25 and the lower active surface of the second boss 27 to generate a pressure differential to achieve drive control of the shear mandrel 5. The embodiment of the present invention realizes remote control of the opening and closing of the ball valve assembly based on the pressure differential principle, does not rely on the cooperation of other tools, has a simple structure, is low in cost, and helps shorten operation time and improve the efficiency and safety of layer switching operations. By detachably connecting a disconnect assembly or a tieback assembly to the top of the outer cylinder, it can be disconnected and tied back from the upper pipe string, thereby increasing the operational flexibility and safety of the tieback pressure differential remote control downhole plugging valve, improving the versatility and applicability of the tieback pressure differential remote control downhole plugging valve, and helping to improve layer switching efficiency.

[0052] In some embodiments, the outer tube includes an upper outer tube 4, a lower outer tube 6, a ball valve outer tube 8 and a lower joint 14 that are connected in sequence from top to bottom and coaxially arranged. The top end of the upper outer tube 4 is detachably connected to a release assembly or a return assembly; the ball valve assembly is arranged in the ball valve outer tube 8; the first bypass hole 23 is provided on the side wall of the upper outer tube 4, and the first boss 25 and the second boss 27 are both slidably connected to the inner wall of the lower outer tube 6.

[0053] like Figure 1As shown, it can be understood that the provision of the upper outer tube 4, the lower outer tube 6, and the ball valve outer tube 8 facilitates the assembly and installation of downhole tools such as the shear mandrel 5 and the ball valve assembly. In this embodiment, the top end of the upper outer tube 4 has an internal thread for detachable connection to a release assembly or a tieback assembly. A first bypass hole 23 is provided on the side wall of the upper outer cylinder 4, and a second bypass hole 24 is provided on the side wall near the top of the shearing mandrel 5. The top of the shearing mandrel 5 is inserted in the upper outer cylinder 4 and can slide axially. The bottom end of the shearing mandrel 5 is extended to insert the lower outer cylinder 6. The first boss 25 and the second boss 27 on the shearing mandrel 5 are realized by processing the shearing mandrel 5 into different axial diameter sections. The area of ​​the step surface of the first boss 25 is larger than the area of ​​the step surface of the second boss 27, and the axial diameter where the first boss 25 is located is larger than the diameter where the second boss 27 is located, thereby forming a downward movement driving chamber between the outer wall of the shearing mandrel 5 above the first boss 25 and the inner wall of the lower outer cylinder 6, and an upward movement driving chamber is formed between the outer wall of the shearing mandrel 5 below the second boss 27 and the inner wall of the lower outer cylinder 6. The lower movement driving chamber and the upper movement driving chamber are driven and controlled to open by the upper rupture disk 33 and the lower rupture disk 34 respectively.

[0054] The bottom end of the ball valve outer tube 8 is also threadedly connected to a lower joint 14 for supporting and connecting the ball valve assembly.

[0055] In some embodiments, the inner wall of the lower outer cylinder 6 is provided with a lower limit step. When the shearing mandrel 5 moves, the upper and lower action surfaces of the first boss 25 can respectively stop at the bottom end of the upper outer cylinder 4 and the lower limit step to limit the position.

[0056] Combine Figure 3 The upper rupture disk 33 provided on the upper outer tube 4 isolates the annulus from the downward motion drive chamber. When the lower rupture disk 34 ruptures, the annular pressure enters the downward motion drive chamber and acts on the upper active surface of the first boss 25. The shear pin 32 is sheared, and the shear mandrel 5 moves downward until the lower active surface of the first boss 25 abuts against the lower limit step on the inner wall of the lower outer tube 6. During this process, the bottom end of the shear mandrel 5 pushes the ball valve assembly to move and open the ball valve assembly. Similarly, the lower rupture disk 34 isolates the annulus from the lower active surface of the second boss 27, driving the shear mandrel 5 upward. When the lower rupture disk 34 ruptures, the annular pressure enters the upward motion drive chamber and acts on the lower active surface of the second boss 27. The shear mandrel 5 moves upward until the upper active surface of the first boss 25 abuts against the bottom end face of the upper outer tube 4. During this process, the bottom end of the shear mandrel 5 drives the ball valve assembly to rotate in the opposite direction and close the ball valve assembly.

[0057] In some embodiments, the release assembly includes a release joint 1, a release spindle 2 and a left-hand nut 3. The top end of the release spindle 2 is threadedly connected to the release joint 1. The outer wall of the release spindle 2 is provided with a first limit step 20 and a first spline 21. The bottom end of the release spindle 2 is inserted into the upper outer tube 4 and can slide and retract in the upper outer tube 4; the left-hand nut 3 is key-connected to the release spindle 2, and the release spindle 2 can drive the left-hand nut 3 to rotate to connect or disconnect from the upper outer tube 4; the inner wall of the upper outer tube 4 is provided with a second spline 22, and the first spline 21 and the second spline 22 can transmit torque when they are engaged.

[0058] like Figure 1 and Figure 5 As shown, the release joint 1 is used to connect the upper pipe section. The top of the release spindle 2 is threadedly connected to the release joint 1, and the bottom end of the release spindle 2 is inserted into the upper outer tube 4 and can move telescopically. The left-handed nut 3 has an external thread. The left-handed nut 3 is sleeved from the top of the release spindle 2 and abuts against the first limit step 20. The left-handed nut 3 and the release spindle 2 are keyed (such as a spline or a flat key, etc.) to facilitate axial relative movement. The release spindle 2 can drive the left-handed nut 3 to rotate and connect to the upper outer tube 4 or disconnect from the upper outer tube 4. After the release assembly enters the well and before being released, the release spindle 2 is axially retracted into a part of the upper outer tube 4 relative to the upper outer tube 4. , the first spline 21 and the second spline 22 are in a staggered state, and the release spindle 2 drives the left-hand nut 3 to be threadedly connected with the upper outer tube 4. At this time, the first bypass hole 23 and the second bypass hole 24 are also in a staggered state, and the shear spindle 5 is fixed by the shear pin 32. After entering the well in this state, when operating other tools, this release assembly acts as one end of the oil pipe and does not participate in the operation until it can isolate the tubing and the annulus to form a seal; when the release spindle 2 is extended relative to the axis of the upper outer tube 4, the first spline 21 and the second spline 22 are engaged, and then the torque can be transmitted through the release spindle 2. It should be noted that the outer wall of the bottom end of the release spindle 2 is provided with a seal that slides with the inner wall of the upper outer tube 4. The release assembly can cooperate with the tubing to perform operations such as rotation and torque transmission.

[0059] In some embodiments, the tie-back assembly includes a tie-back joint 15, a tie-back claw 16, a tie-back spindle 17 and a combined seal 18. The top end of the tie-back spindle 17 is threadedly connected to the tie-back joint 15, and the bottom end of the tie-back spindle 17 is inserted into the upper outer tube 4; the tie-back claw 16 is sleeved on the tie-back spindle 17 and threadedly connected to the upper outer tube 4; the combined seal 18 is sleeved on the tie-back spindle 17, and when the bottom end of the tie-back spindle 17 is inserted into the upper outer tube 4, the combined seal 18 is clamped between the tie-back spindle 17 and the upper outer tube 4 for sealing.

[0060] In some embodiments, a guide joint 19 is provided at the bottom end of the tie-back spindle 17 , and the upper and lower ends of the combined seal 18 respectively abut against the outer wall of the tie-back spindle 17 and the guide joint 19 .

[0061] Combine Figure 2 and Figure 6 The tieback assembly is installed with the upper outer tube 4 when a tieback is required. After the upper outer tube 4 is inserted under the action of the guide joint 19, the combined seal 18 isolates and seals the inside and outside of the pipe string. At the same time, the tieback claw 16 is threadedly connected to the top of the upper outer tube 4 to form a fixed connection between the upper pipe string and the upper outer tube 4.

[0062] In some embodiments, the ball valve assembly includes an elastic claw 7, a ball seat short section 13, and a ball valve assembly 11. The top end of the elastic claw 7 is inserted into the gap between the shear mandrel 5 and the lower outer tube 6, allowing the top end of the elastic claw 7 to slide axially within the gap. The bottom end of the elastic claw 7 is sequentially connected to a connecting short section 9 and an operating pin 12. When the shear mandrel 5 moves, it can drive the elastic claw 7 to move. The ball seat short section 13 is connected to the ball valve outer tube 8. The ball valve assembly 11 is located at the top of the ball seat short section 13 and is limited by a ball cage 10. The operating pin 12 is movably connected to the ball valve assembly 11. When the elastic claw 7 moves, it can drive the operating pin 12 to move, and the operating pin 12 drives the ball valve assembly 11 to open or close.

[0063] Combine Figure 4 The bottom end of the elastic claw 7 is threadedly connected to the connecting nipple 9, which is fixedly connected to the operating pin 12. When the shear mandrel 5 moves, it can drive the coordinated movement of the elastic claw 7, the connecting nipple 9, and the operating pin 12. Then, through the movable connection between the operating pin 12 and the ball valve assembly 11, the rotation angle of the ball valve assembly 11 is controlled, thereby achieving the opening and closing of the ball valve assembly 11. It can be understood that the axial movement stroke of the elastic claw 7 generally needs to meet the switching of the ball valve assembly 11 by rotating 90° to achieve the opening and closing, so as to ensure the connection or isolation effect of the ball valve assembly 11.

[0064] In some embodiments, the outer tube further includes a lower joint 14 , which is threadedly connected to the ball valve outer tube 8 , and the ball seat short section 13 is threadedly connected to the lower joint 14 , thereby achieving position limiting of the ball valve assembly 11 .

[0065] In some embodiments, the ball valve assembly 11 is provided with an operating hole 30 , and an operating lug 31 is provided on the inner wall of the operating pin 12 . The operating lug 31 is inserted into the operating hole 30 .

[0066] Recombination Figure 4 It can be understood that the ball valve assembly 11 is limited to the top of the ball seat short section 13 by the ball cage 10. An axial gap is provided between the ball cage 10 and the ball seat short section 13, so that the operating lug 31 can be movably connected to the operating hole 30 on the ball valve assembly 11 through the gap. When the operating pin 12 moves axially, the operating lug 31 can drive the ball valve assembly 11 to rotate ±90° through the operating hole 30, thereby realizing control of the ball valve assembly 11.

[0067] In some embodiments, a third limiting step 29 is provided on the inner wall of the top end of the elastic claw 7, and a second limiting step 28 and a fourth limiting step 35 are provided on the outer wall of the bottom end of the shearing spindle 5. When the third limiting step 29 moves, it can be limited between the second limiting step 28 and the fourth limiting step 35.

[0068] For example Figure 4 , combined with Figure 1 and Figure 2 When the third limiting step 29 abuts the second limiting step 28, the elastic claw 7 moves to its lowest position. When the top end face of the elastic claw 7 abuts the fourth limiting step 35, the elastic claw 7 moves to its highest position. An annular groove is formed between the second limiting step 28 and the fourth limiting step 35 on the shearing mandrel 5. This annular groove and the inner wall of the lower outer cylinder 6 form a sliding space for the top end of the elastic claw 7. The elastic claw 7 can move axially within the annular groove. The outer wall of the elastic claw 7 abuts the inner wall of the lower outer cylinder 6, and the inner wall of the third limiting step abuts the bottom of the annular groove on the shearing mandrel 5, ensuring the axial movement direction of the elastic claw 7.

[0069] The reconnectable pressure differential remote-controlled downhole sealing valve of the present invention, through the arrangement of the above-mentioned release assembly, reconnection assembly and ball valve assembly, realizes the process of oil testing and layer conversion without lowering bridge plugs, injecting cement and using high-density mud to kill the well, thereby effectively improving operating efficiency, reducing reservoir damage and realizing safe and efficient oil testing and layer conversion.

[0070] Specifically, the reconnectable pressure differential remote-controlled downhole plugging valve provided by the present invention is used to illustrate the working principle of the following operating states.

[0071] (1) Initial state after entering the well / before leaving:

[0072] Before entering the well, the release assembly is assembled and connected with the upper outer cylinder 4, as shown in the figure. Figure 1 At this point, the ball valve assembly 11, the first bypass hole 23 on the upper outer tube 4, and the second bypass hole 24 on the shear mandrel 5 are misaligned. In this state, when operating other tools after entering the wellbore, the reconnectable, differential-pressure-controlled downhole plugging valve of this embodiment, acting as one end of the tubing, does not participate in the operation, merely providing a seal between the tubing string and the annulus. The shear pins now secure the shear mandrel 5 relative to the upper outer tube 4.

[0073] (2) Rotation and torque transmission state with the pipe string:

[0074] When it is necessary to cooperate with the rotating packer for setting, the reconnectable pressure differential remote control downhole sealing valve will not interfere with anything and the packer can be set normally. If it is necessary to cooperate with other tools to transmit the string torque, the reconnectable pressure differential remote control downhole sealing valve of the present invention needs to be in a stretched state. Figure 1 and Figure 7 The release shaft 2 changes from a telescopic state to a stretched state, and the first limiting step 20 on the release shaft 2 abuts against the right end face of the left-hand nut 3, limiting its maximum stretched state. At this time, the first spline 21 and the second spline 22 engage with each other to transmit torque.

[0075] (3) Well shut-in status before disposal:

[0076] When shutting in the well, the annular space needs to be pressurized to break the lower rupture disk 34, so that the annular space pressure enters the upward movement driving chamber formed between the shear mandrel 5 and the lower outer tube 6 in the lower rupture disk 34. The annular space pressure acts on the lower working surface of the second boss 27 in the shear mandrel 5, pushing the shear mandrel 5 to the left (upward) until the upper working surface of the first boss 25 on the shear mandrel 5 abuts against the bottom end surface (upper limit position 36) of the upper outer tube 4. At the same time, the shear mandrel 5 drags the elastic claw 7, the connecting short section 9 and the operating pin 12 in sequence, thereby rotating the ball valve assembly 11 90 degrees, so that it moves from Figure 1 The open state changes to Figure 8 Closed state.

[0077] (4) Hands-off operation:

[0078] When the well is shut in and a release operation is required, the release spindle 2 and the upper outer tube 4 are in a relatively compressed state, so that the first spline 21 and the second spline 22 are in a misaligned state. At this time, the release spindle 2 drives the left-hand nut 3 to rotate and exit from the threaded hole of the upper outer tube 4. Figure 9 Continue to drag the release joint 1, and then the release assembly can be pulled out of the upper outer tube 4. Figure 10 .

[0079] (5) Tieback operation:

[0080] When tieback is needed, insert the tieback assembly into the upper outer tube 4. At this time, the combined seal 18 isolates and seals the pipe column. At the same time, the tieback claw 16 is threadedly connected to the top of the upper outer tube 4 to form a fixed connection between the upper pipe column and the upper outer tube 4. At this time, the tieback is completed. Figure 11 .

[0081] (6) Well opening status after tie-back:

[0082] After the tie-back, when the well needs to be opened and the bypass needs to be closed, it is only necessary to pressurize the wellbore. At this time, the upper rupture disk 33 ruptures, and the annular pressure enters the downward movement driving chamber. The annular pressure acts on the upper action surface of the first boss 25, thereby pushing the shear mandrel 5 to the right (downward). At this time, the first bypass hole 23 and the second bypass hole 24 are misaligned to form a sealed isolation. Figure 12 , the shear mandrel 5 continues to move to the right until the lower action surface of the first boss 25 abuts against the lower limit step on the lower outer cylinder 6. At this time, the ball valve assembly 11 in the ball valve assembly rotates 90 degrees, so that it moves from Figure 11 The closed state becomes Figure 12 Open state. At this point, all tool actions are completed.

[0083] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pressure differential remote-controlled downhole plugging valve that can be reconnected, characterized in that: include: An outer cylinder, wherein a first bypass hole (23) is provided on a side wall of the outer cylinder, the top end of the outer cylinder is detachably connected to a hand-off assembly or a tie-back assembly, and the bottom end of the outer cylinder is provided with the ball valve assembly; A shearing mandrel (5), the shearing mandrel (5) is fixed to the interior of the outer cylinder by a shearing pin (32), and a second bypass hole (24) is provided on the side wall of the shearing mandrel (5); a first boss (25) and a second boss (27) are provided on the outer cylindrical surface (26) of the shearing mandrel (5); the area of ​​the upper active surface of the first boss (25) is larger than the area of ​​the lower active surface of the second boss (27); a lower rupture disk (34), the lower rupture disk (34) being arranged on the outer cylinder to isolate the annulus and the lower working surface of the second boss (27); after the lower rupture disk (34) ruptures, the annulus pressure acts on the lower working surface of the second boss (27) and pushes the shear mandrel (5) to move upward, the first bypass hole (23) and the second bypass hole (24) are connected, and the ball valve assembly is closed; An upper rupture disk (33) is provided on the outer cylinder to isolate the annulus and the upper working surface of the first boss (25). After the upper rupture disk (33) ruptures, the annulus pressure acts on the upper working surface of the first boss (25). The annulus pressure forms a pressure difference between the upper working surface of the first boss (25) and the lower working surface of the second boss (27). The shear mandrel (5) moves downward under the action of the pressure difference, the first bypass hole (23) and the second bypass hole (24) are staggered, and the ball valve assembly opens.

2. The reconnectable pressure differential remote control downhole plugging valve according to claim 1, characterized in that: The outer cylinder comprises an upper outer cylinder (4), a lower outer cylinder (6) and a ball valve outer cylinder (8) which are connected in sequence from top to bottom and are coaxially arranged. The top end of the upper outer cylinder (4) is detachably connected to the release assembly or the reconnection assembly. The ball valve assembly is arranged in the ball valve outer cylinder (8). The first bypass hole (23) is arranged on the side wall of the upper outer cylinder (4), and the first boss (25) and the second boss (27) are both slidably connected to the inner wall of the lower outer cylinder (6).

3. The reconnectable pressure differential remote control downhole plugging valve according to claim 2, characterized in that: The inner wall of the lower outer cylinder (6) is provided with a lower limiting step. When the shearing mandrel (5) moves, the upper and lower acting surfaces of the first boss (25) can respectively stop at the bottom end of the upper outer cylinder (4) and the lower limiting step to limit the position.

4. The reconnectable pressure differential remote control downhole plugging valve according to claim 2, characterized in that: The hands-off assembly comprises: Release connector (1); A release spindle (2), the top end of which is threadedly connected to the release joint (1), the outer wall of which is provided with a first limiting step (20) and a first spline (21), the bottom end of which is inserted into the upper outer cylinder (4) and is capable of sliding and retracting in the upper outer cylinder (4); A left-handed nut (3) is key-connected to the release shaft (2), and the release shaft (2) can drive the left-handed nut (3) to rotate to connect or disconnect from the upper outer cylinder (4); the inner wall of the upper outer cylinder (4) is provided with a second spline (22), and the first spline (21) and the second spline (22) can transmit torque when they are engaged.

5. The reconnectable pressure differential remote control downhole plugging valve according to claim 2, characterized in that: The tieback assembly comprises: Tieback connector (15); A tie-back spindle (17), the top end of which is threadedly connected to the tie-back joint (15), and the bottom end of which is inserted into the upper outer cylinder (4); A connecting claw (16), the connecting claw (16) is sleeved on the connecting spindle (17) and is threadedly connected to the upper outer cylinder (4); A combined seal (18) is sleeved on the reconnecting core shaft (17). When the bottom end of the reconnecting core shaft (17) is inserted into the upper outer cylinder (4), the combined seal (18) is clamped between the reconnecting core shaft (17) and the upper outer cylinder (4) to seal.

6. The reconnectable pressure differential remote control downhole plugging valve according to claim 5, characterized in that: A guide joint (19) is provided at the bottom end of the reconnecting spindle (17), and the upper and lower ends of the combined seal (18) respectively abut against the outer wall of the reconnecting spindle (17) and the guide joint (19).

7. The reconnectable pressure differential remote control downhole plugging valve according to claim 2, characterized in that: The ball valve assembly comprises: An elastic claw (7), the top end of which is inserted into the gap between the shearing mandrel (5) and the lower outer cylinder (6), and the bottom end of which is sequentially connected to a connecting short section (9) and an operating pin (12), so that the shearing mandrel (5) can drive the elastic claw (7) to move when it moves; A ball seat short section (13), wherein the ball seat short section (13) is connected to the ball valve outer tube (8); The ball valve assembly (11) is located at the top of the ball seat short section (13) and is limited by the ball cage (10). The operating pin (12) is movably connected to the ball valve assembly (11). When the elastic claw (7) moves, it can drive the operating pin (12) to move. The operating pin (12) drives the ball valve assembly (11) to open or close.

8. The reconnectable pressure differential remote control downhole plugging valve according to claim 7, characterized in that: The outer cylinder further comprises a lower joint (14), the lower joint (14) being threadedly connected to the ball valve outer cylinder (8), and the ball seat short section (13) being threadedly connected to the lower joint (14).

9. The reconnectable pressure differential remote control downhole plugging valve according to claim 7, characterized in that: The ball valve assembly (11) is provided with an operating hole (30), and the inner wall of the operating pin (12) is provided with an operating lug (31), and the operating lug (31) is inserted into the operating hole (30).

10. The reconnectable pressure differential remote control downhole plugging valve according to claim 7, characterized in that: The top inner wall of the elastic claw (7) is provided with a third limiting step (29), and the bottom outer wall of the shearing mandrel (5) is provided with a second limiting step (28) and a fourth limiting step (35). When the third limiting step (29) moves, it can be limited between the second limiting step (28) and the fourth limiting step (35).

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