Back-actuated differential pressure remotely controlled downhole shut-off valve
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2024-10-30
- Publication Date
- 2026-06-23
Smart Images
Figure CN120649839B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of downhole equipment technology for oil and gas well operations, and in particular to a reconnectable differential pressure remote-controlled downhole plugging valve. Background Technology
[0002] The current deep and ultra-deep well testing cycle is too long, with the average transition time for well control and inter-layer plugging accounting for a large proportion. High-density well control fluid is used during the transition period, and well control fluid leakage can easily lead to reservoir damage, affecting the testing time and oil and gas well productivity.
[0003] Using plugging valves in conjunction with packers can achieve rapid formation switching, avoid reservoir damage, improve oil testing efficiency, and accelerate the exploration process. In oil testing operations in complex high-temperature, high-pressure environments, most wells have two or more formations, with some having more than five. Depending on the formation conditions, plugging valves need to withstand high temperatures and pressures (200℃ / 105MPa), be able to inject cement (with a channel), be able to be unsealed (able to be retrieved), be able to be reconnected (able to produce), and have high sealing performance (considering the gas slippage effect). This means that plugging valves cannot be directly used for circulation fluid replacement or well control operations, requiring the use of other tools. This increases the complexity and cost of the operation, and may prolong the operation time, affecting overall operational efficiency and safety. Summary of the Invention
[0004] The purpose of this invention is to provide a reversible differential pressure remote-controlled downhole plugging valve for oil testing operations in complex high-temperature and high-pressure environments, which can meet the needs of rapid layer transition.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] A reconnectable differential pressure remote-controlled downhole plugging valve, comprising:
[0007] The outer cylinder has a first bypass hole on its side wall, and the top of the outer cylinder is detachably connected to a release assembly or a reconnection assembly. The bottom of the outer cylinder is provided with the ball valve assembly.
[0008] A shearing mandrel is fixed inside the outer cylinder by a shearing pin. The side wall of the shearing mandrel is provided with a second bypass hole. A first boss and a second boss are provided at intervals on the outer circular surface of the shearing mandrel. The area of the upper working surface of the first boss (25) is greater than the area of the lower working surface of the second boss (27).
[0009] The lower rupture disc is disposed on the outer cylinder to isolate the annulus and the lower working surface of the second boss. After the lower rupture disc 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 disc is disposed on the outer cylinder to isolate the annulus and the upper working surface of the first boss. After the upper rupture disc ruptures, the annulus pressure acts on the upper working surface of the first boss, and 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 mandrel moves downward under the action of the pressure difference, the first bypass hole and the second bypass hole are misaligned, and the ball valve assembly opens.
[0011] In some embodiments, the outer cylinder includes an upper outer cylinder, a lower outer cylinder, and a ball valve outer cylinder that are sequentially connected from top to bottom and coaxially arranged. The top end of the upper outer cylinder is detachably connected to the release assembly or the reconnection assembly. The ball valve assembly is disposed inside the ball valve outer cylinder. The first bypass hole is disposed on the side wall of the upper outer cylinder, and the first boss and the second boss are both slidably connected to the inner wall of the lower outer cylinder.
[0012] In some embodiments, the inner wall of the lower outer cylinder is provided with a lower limiting step. When the shear mandrel moves, the upper and lower working surfaces of the first boss can respectively abut against the bottom end of the upper outer cylinder and the lower limiting step to limit the movement.
[0013] In some embodiments, the release component includes:
[0014] Disconnector;
[0015] The release spindle has its top end threadedly connected to the release connector. The outer wall of the release spindle is provided with a first limiting step and a first spline. The bottom end of the release spindle is inserted into the upper outer cylinder and can slide and extend within the upper outer cylinder.
[0016] A left-handed nut is connected to the release spindle key, and the release spindle can drive the left-handed nut to rotate to connect or disconnect from the upper outer cylinder; the inner wall of the upper outer cylinder is provided with a second spline, and the first spline and the second spline can transmit torque when they mesh.
[0017] In some embodiments, the reconnection component includes:
[0018] Reconnector;
[0019] A return mandrel is threaded to the return connector at its top end, and the bottom end of the return mandrel is inserted into the upper outer cylinder.
[0020] A return claw, which is sleeved on the return mandrel and threaded to the upper outer cylinder;
[0021] A combined seal is fitted onto the reconnection mandrel. When the bottom end of the reconnection mandrel is inserted into the upper outer cylinder, the combined seal is sandwiched between the reconnection mandrel and the upper outer cylinder to provide a seal.
[0022] In some embodiments, the bottom end of the reconnection mandrel is provided with a guide joint, and the upper and lower ends of the combined seal abut against the outer wall of the reconnection mandrel and the guide joint, respectively.
[0023] In some embodiments, the ball valve assembly includes:
[0024] The elastic claw has its top end inserted into the gap between the shearing mandrel and the lower outer cylinder, and its bottom end is sequentially connected to a connecting short section and an operating pin. When the shearing mandrel moves, it can drive the elastic claw to move.
[0025] A ball seat short section, which is connected to the outer cylinder of the ball valve;
[0026] A ball valve assembly is located at the top of the ball seat section and is limited by a 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. The operating pin drives the ball valve assembly to open or close.
[0027] In some embodiments, the outer cylinder further includes a lower connector, which is threadedly connected to the outer cylinder of the ball valve, and the ball seat short section is threadedly connected to the lower connector.
[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, which is inserted into the operating hole.
[0029] In some embodiments, the inner wall of the top end of the elastic claw is provided with a third limiting step, and the outer wall of the bottom end of the shearing mandrel is provided with a second limiting step and a fourth limiting step. When the third limiting step moves, it can be limited to between the second limiting step and the fourth limiting step.
[0030] The beneficial effects of this invention are:
[0031] The reconnectable differential pressure remote-controlled downhole plugging valve provided by this invention controls the movement of the upper and lower fracturing discs to drive the shear mandrel through annular pressure control, thereby achieving differential pressure remote control of the opening and closing of the ball valve assembly. It does not rely on other tools, has a simple structure, low cost, and helps shorten operation time, improving the efficiency and safety of layer transfer operations. By detachably connecting a release assembly or a reconnection assembly to the top of the outer cylinder, it can be disconnected from and reconnected to the upper tubing string, increasing the operational flexibility and safety of the reconnectable differential pressure remote-controlled downhole plugging valve, improving its versatility and applicability, and ultimately enhancing layer transfer efficiency. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of the reconnectable differential pressure remote-controlled downhole plugging valve provided in an embodiment of the present invention (state before release after insertion into the well with release assembly);
[0033] Figure 2 This is a schematic diagram of the reconnectable differential pressure remote-controlled downhole plugging valve provided in an embodiment of the present invention (with the reconnection assembly in the state before well opening after reconnection);
[0034] Figure 3 This is a schematic diagram of the power and bypass mechanism in the reconnectable differential pressure remote-controlled downhole plugging valve provided in an embodiment of the present invention;
[0035] Figure 4 This is a schematic diagram of the ball valve portion in the reconnectable differential pressure remote-controlled downhole plugging valve provided in an embodiment of the present invention;
[0036] Figure 5 This is a schematic diagram of the release and torque transmission part of the reconnectable differential pressure remote control downhole plugging valve provided in an embodiment of the present invention;
[0037] Figure 6 This is a schematic diagram of the reconnection section in the reconnectable differential pressure remote control downhole plugging valve provided in an embodiment of the present invention;
[0038] Figure 7 This is a schematic diagram of the state when transmitting tubing torque in a reconnectable differential pressure remote downhole plugging valve provided in an embodiment of the present invention;
[0039] Figure 8 This is a schematic diagram of the state of well shut-in and bypass opening in the reconnectable differential pressure remote downhole plugging valve provided in the 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 in this embodiment of the invention before release;
[0041] Figure 10This is a schematic diagram of the state after the release assembly of the reconnectable differential pressure remote control downhole plugging valve has been released, according to an embodiment of the present invention.
[0042] Figure 11 This is a schematic diagram of the reconnection state of the reconnection assembly on the reconnectable differential pressure remote control downhole plugging valve provided in an embodiment of the present invention;
[0043] Figure 12 This is a schematic diagram of the well opening state after reconnection of the reconnectable differential pressure remote control downhole plugging valve provided in an embodiment of the present invention.
[0044] In the picture:
[0045] 1. Release coupling; 2. Release 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 sub; 10. Ball cage; 11. Ball valve assembly; 12. Operating pin; 13. Ball seat sub; 14. Lower coupling; 15. Reconnection coupling; 16. Reconnection claw; 17. Reconnection spindle; 18. Combined seal; 19. Guide coupling; 20. 21. First spline; 22. Second spline; 23. First bypass hole; 24. Second bypass hole; 25. First boss; 26. Outer circular surface; 27. Second boss; 28. Second limiting step; 29. Third limiting step; 30. Operating hole; 31. Operating lug; 32. Shear pin; 33. Upper rupture disc; 34. Lower rupture disc; 35. Fourth limiting step; 36. Upper limit point. Detailed Implementation
[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0047] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0049] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0050] Combination Figures 1-12 This invention provides a reconnectable differential pressure remote-controlled downhole plugging valve, comprising an outer cylinder, a shear mandrel 5, an upper fracturing disc 33, and a lower fracturing disc 34. The outer cylinder has a first bypass hole 23 on its side wall. A release assembly or a reconnection assembly is detachably connected to the top of the outer cylinder, and a ball valve assembly is located at the bottom of the outer cylinder. The shear mandrel 5 is fixed inside the outer cylinder by shear pins 32, and a second bypass hole 24 is provided on its side wall. A first boss 25 and a second boss 27 are spaced apart on the outer circular surface 26 of the shear mandrel 5. 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 lower fracturing disc 34 is disposed on the outer cylinder to isolate the annulus and the lower working surface of the second boss 27. After the disc 34 ruptures, the annular pressure acts on the lower working surface of the second boss 27 and pushes the shear mandrel 5 upward. The first bypass hole 23 and the second bypass hole 24 are connected, and the ball valve assembly is closed. The upper rupture disc 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 disc 33 ruptures, the annular 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 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 misaligned, and the ball valve assembly is opened.
[0051] The present invention provides a reversible differential pressure remote-controlled downhole plugging valve. The outer cylinder serves as the main support structure, forming an annulus between the outer cylinder and the wellbore. Liquid can be injected into the annulus to pressurize it and create annulus pressure. By installing a shear mandrel 5 inside the outer cylinder and upper and lower fracturing discs 33 and 34 on the outer cylinder to isolate the annulus, differential pressure remote-controlled plugging and well opening operations can be performed at designated locations. Figure 3 The upper fracturing disc 33 and the lower fracturing disc 34 are arranged sequentially from top to bottom. Annular pressure controls the upper fracturing disc 33 and the lower fracturing disc 34 to drive the shear mandrel 5 downward or upward, respectively. Since the lower fracturing disc 34 is located below and the upper fracturing disc 33 is located above, during operation, the lower fracturing disc 34 performs fracturing and shut-in first. Therefore, during well opening, a pressure differential is required between the upper working surface of the first protrusion 25 and the lower working surface of the second protrusion 27 to achieve driving control of the shear mandrel 5. This embodiment of the invention achieves remote control of the opening and closing of the ball valve assembly based on the pressure differential principle. It does not rely on the cooperation of other tools, has a simple structure, low cost, and helps to shorten operation time, improve the efficiency and safety of layer transfer operations. By detachably connecting the release assembly or reconnection assembly to the top of the outer cylinder, it achieves detachment and reconnection from the upper tubing string, increasing the operational flexibility and safety of the reconnectable pressure differential remote-controlled downhole plugging valve, improving the versatility and applicability of the reconnectable pressure differential remote-controlled downhole plugging valve, and helping to improve layer transfer efficiency.
[0052] In some embodiments, the outer cylinder includes an upper outer cylinder 4, a lower outer cylinder 6, a ball valve outer cylinder 8, and a lower connector 14 that are sequentially connected from top to bottom and coaxially arranged. The top end of the upper outer cylinder 4 is detachably connected to a release assembly or a reconnection assembly. The ball valve assembly is disposed inside the ball valve outer cylinder 8. A first bypass hole 23 is disposed on the side wall of the upper outer cylinder 4, and a first boss 25 and a second boss 27 are both slidably connected to the inner wall of the lower outer cylinder 6.
[0053] like Figure 1As shown, the upper outer cylinder 4, lower outer cylinder 6, and ball valve outer cylinder 8 are designed to facilitate the assembly of downhole tools such as the shear mandrel 5 and ball valve assembly. In this embodiment, the top end of the upper outer cylinder 4 has an internal thread for detachable connection to the release assembly or reconnection assembly. The upper outer cylinder 4 has a first bypass hole 23 on its side wall, and the shearing mandrel 5 has a second bypass hole 24 on its side wall near the top. The top of the shearing mandrel 5 is inserted into the upper outer cylinder 4 and can slide axially. The bottom of the shearing mandrel 5 extends and is inserted into the lower outer cylinder 6. The first boss 25 and the second boss 27 on the shearing mandrel 5 are achieved by machining the shearing mandrel 5 into different shaft diameter sections. The area of the stepped surface of the first boss 25 is larger than the area of the stepped surface of the second boss 27. The shaft diameter of the first boss 25 is larger than the diameter of the second boss 27. Thus, a downward motion drive cavity is formed between the outer wall of the shearing mandrel 5 above the first boss 25 and the inner wall of the lower outer cylinder 6. An upward motion drive cavity 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 downward motion drive cavity and the upward motion drive cavity are driven and controlled to open by the upper rupture disc 33 and the lower rupture disc 34, respectively.
[0054] The bottom end of the outer cylinder 8 of the ball valve is also threaded with a lower connector 14, which is used to support and connect the ball valve assembly.
[0055] In some embodiments, the inner wall of the lower outer cylinder 6 is provided with a lower limiting step. When the shear mandrel 5 moves, the upper and lower working surfaces of the first boss 25 can respectively abut against the bottom end of the upper outer cylinder 4 and the lower limiting step to limit the movement.
[0056] Combination Figure 3 The upper rupture disc 33, located on the upper outer cylinder 4, isolates the annulus and the downward motion drive chamber. When the lower rupture disc 34 ruptures, the annulus pressure enters the downward motion drive chamber and acts on the upper working surface of the first boss 25, shearing pin 32 is cut off, and shearing mandrel 5 moves downward until the lower working surface of the first boss 25 abuts against the lower limit step on the inner wall of the lower outer cylinder 6. During this process, the bottom end of shearing mandrel 5 pushes the ball valve assembly to move and open the ball valve assembly. Similarly, the lower rupture disc 34 isolates the annulus and the lower working surface of the second boss 27, driving shearing mandrel 5 to move upward. When the lower rupture disc 34 ruptures, the annulus pressure enters the upward motion drive chamber and acts on the lower working surface of the second boss 27, causing shearing mandrel 5 to move upward until the upper working surface of the first boss 25 abuts against the bottom end face of the upper outer cylinder 4. During this process, the bottom end of shearing 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 connector 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 connector 1. The outer wall of the release spindle 2 is provided with a first limiting step 20 and a first spline 21. The bottom end of the release spindle 2 is inserted into the upper outer cylinder 4 and can slide and extend within the upper outer cylinder 4. The left-hand nut 3 is keyed to the release spindle 2. The release spindle 2 can drive the left-hand nut 3 to rotate to connect to or disconnect from the upper outer cylinder 4. The inner wall of the upper outer cylinder 4 is provided with a second spline 22. When the first spline 21 and the second spline 22 are engaged, they can transmit torque.
[0058] like Figure 1 and Figure 5 As shown, the release connector 1 is used to connect to the upper pipe section. The top end of the release spindle 2 is threadedly connected to the release connector 1, and the bottom end of the release spindle 2 is inserted into the upper outer cylinder 4 and can extend and retract. The left-hand nut 3 has an external thread and is fitted from the top end of the release spindle 2, abutting against the first limiting step 20. The left-hand nut 3 and the release spindle 2 are keyed together (such as with a spline or flat key) to facilitate axial relative movement. The release spindle 2 can drive the left-hand nut 3 to rotate and connect to or disconnect from the upper outer cylinder 4. After the release assembly is inserted into the well and before release, the release spindle 2 retracts axially into the upper outer cylinder 4 to a portion of its length. The first spline 21 and the second spline 22 are misaligned. The release mandrel 2 drives the left-hand nut 3 to connect threadedly to the upper outer cylinder 4. At this time, the first bypass hole 23 and the second bypass hole 24 are also misaligned. The shear mandrel 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 tubing and does not participate in the operation, until it can isolate the tubing string and form a seal in the annulus. When the release mandrel 2 extends relative to the axis of the upper outer cylinder 4, the first spline 21 and the second spline 22 engage, thereby transmitting torque through the release mandrel 2. It should be noted that the bottom outer wall of the release mandrel 2 is equipped with a sealing element that slides and seals with the inner wall of the upper outer cylinder 4. The release assembly can cooperate with the tubing string to perform operations such as rotation and torque transmission.
[0059] In some embodiments, the reconnection assembly includes a reconnection connector 15, a reconnection claw 16, a reconnection spindle 17, and a combined seal 18. The top end of the reconnection spindle 17 is threaded to the reconnection connector 15, and the bottom end of the reconnection spindle 17 is inserted into the upper outer cylinder 4. The reconnection claw 16 is sleeved on the reconnection spindle 17 and threaded to the upper outer cylinder 4. The combined seal 18 is sleeved on the reconnection spindle 17. When the bottom end of the reconnection spindle 17 is inserted into the upper outer cylinder 4, the combined seal 18 is sandwiched between the reconnection spindle 17 and the upper outer cylinder 4 to seal.
[0060] In some embodiments, the bottom end of the reconnecting spindle 17 is provided with a guide joint 19, and the upper and lower ends of the combined seal 18 abut against the outer wall of the reconnecting spindle 17 and the guide joint 19, respectively.
[0061] Combination Figure 2 and Figure 6 The reconnection assembly is installed with the upper outer cylinder 4 when reconnection is required. After the upper outer cylinder 4 is inserted under the action of the guide joint 19, the combined seal 18 isolates and seals the inside and outside of the tube column, while the reconnection claw 16 is threaded to the top of the upper outer cylinder 4 to form a fixed connection between the upper tube column and the upper outer cylinder 4.
[0062] In some embodiments, the ball valve assembly includes a resilient claw 7, a ball seat section 13, and a ball valve assembly 11. The top end of the resilient claw 7 is inserted into the gap between the shearing mandrel 5 and the lower outer cylinder 6, allowing the top end of the resilient claw 7 to slide axially within the gap. The bottom end of the resilient claw 7 is sequentially connected to a connecting section 9 and an operating pin 12; when the shearing mandrel 5 moves, it can drive the resilient claw 7 to move; the ball seat section 13 is connected to the outer cylinder 8 of the ball valve; the ball valve assembly 11 is located at the top end of the ball seat 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 resilient 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] Combination Figure 4 The bottom end of the elastic claw 7 is threadedly connected to a short section 9, which is fixedly connected to an operating pin 12. When the shear spindle 5 moves, it drives the elastic claw 7, the short section 9, and the operating pin 12 to move in tandem. This, in turn, connects the operating pin 12 to the ball valve assembly 11, controlling the rotation angle of the ball valve assembly 11 and thus opening and closing it. It can be understood that the axial travel of the elastic claw 7 generally needs to allow the ball valve assembly 11 to rotate 90° to switch between opening and closing, ensuring the connectivity or isolation effect of the ball valve assembly 11.
[0064] In some embodiments, the outer cylinder further includes a lower connector 14, which is threadedly connected to the outer cylinder 8 of the ball valve, and the ball seat short section 13 is threadedly connected to the lower connector 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 the inner wall of the operating pin 12 is provided with an operating lug 31, which is inserted into the operating hole 30.
[0066] Combined Figure 4 It can be understood that the ball valve assembly 11 is limited to the top of the ball seat section 13 by the ball cage 10. An axial gap is provided between the ball cage 10 and the ball seat 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 the control of the ball valve assembly 11.
[0067] In some embodiments, the inner wall of the top end of the elastic claw 7 is provided with a third limiting step 29, and the outer wall of the bottom end 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.
[0068] For example Figure 4 , combined Figure 1 and Figure 2 When the third limiting step 29 abuts against 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 against 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 forms a sliding space for the top end of the elastic claw 7 with the inner wall of the lower outer cylinder 6. The elastic claw 7 can move axially within the annular groove. The outer wall of the elastic claw 7 abuts against the inner wall of the lower outer cylinder 6, and the inner wall of the third limiting step abuts against the bottom of the annular groove on the shearing mandrel 5, ensuring the axial movement direction of the elastic claw 7.
[0069] The reconnectable differential pressure remote downhole plugging valve of the present invention, through the above-mentioned release assembly, reconnection assembly and ball valve assembly, enables the use of bridge plugs, cement injection and high-density mud for well control during oil testing and layer transfer without the need for high-density mud, thereby effectively improving operational efficiency, reducing reservoir damage and achieving safe and efficient oil testing and layer transfer.
[0070] Specifically, the working principle of the following operating states is explained using the reversible differential pressure remote-controlled downhole plugging valve provided by this invention.
[0071] (1) Initial state after entering the well / before releasing the hand:
[0072] Before entering the well, the release assembly is assembled and connected to the upper outer cylinder 4, such as... Figure 1 At this point, the ball valve assembly 11, the first bypass hole 23 on the upper outer cylinder 4, and the second bypass hole 24 on the shear mandrel 5 are misaligned. After entering the well in this state, when operating other tools, the reversible differential pressure remote downhole sealing valve of this embodiment, acting as one end of the tubing, does not participate in the operation; it only needs to isolate the tubing string from the annulus to form a seal. At this time, the position of the shear mandrel 5 is fixed by the shear pin, fixing its relative position to the upper outer cylinder 4.
[0073] (2) Rotation and torque transmission state in conjunction with the tubing column:
[0074] When setting a rotating packer, the reversible differential pressure remote-controlled downhole plugging valve causes no interference, allowing for normal packer setting. If it needs to be used with other tools to transmit tubing torque, the reversible differential pressure remote-controlled downhole plugging valve of this invention needs to be in the tensioned state. Figure 1 and Figure 7 When the release spindle 2 changes from the telescopic state to the stretched state, the first limiting step 20 on the release spindle 2 abuts against the right end face of the left-hand nut 3, limiting its maximum stretch value. At this time, the first spline 21 and the second spline 22 engage, and torque can be transmitted.
[0075] (3) Well-closing status before disengagement:
[0076] When well shut-in operation is required, annular pressure is applied to break the lower fracture plate 34, allowing annular pressure to enter the upward motion drive chamber formed between the shear mandrel 5 and the lower outer cylinder 6 within the lower fracture plate 34. The annular 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 face (upper limit point 36) of the upper outer cylinder 4. Simultaneously, the shear mandrel 5 sequentially drags the elastic claw 7, connecting sub 9, and operating pin 12, thereby rotating the ball valve assembly 11 by 90°, causing it to... Figure 1 Open state becomes Figure 8 The device is in the off state.
[0077] (4) Hands-free operation:
[0078] When a release operation is required after the well is shut in, the release mandrel 2 and the upper outer cylinder 4 must be in a state of relative compression, causing the first spline 21 and the second spline 22 to be misaligned. At this time, the release mandrel 2 drives the left-hand nut 3 to rotate and exit from the threaded opening of the upper outer cylinder 4. Figure 9 Continue dragging the release connector 1 to pull the entire release assembly out of the upper outer cylinder 4. The released assembly will then appear as follows: Figure 10 .
[0079] (5) Reconnection operation:
[0080] When reconnection is required, insert the reconnection assembly into the upper outer cylinder 4. At this time, the combined seal 18 isolates and seals the tubing. Simultaneously, the reconnection claw 16 and the top thread of the upper outer cylinder 4 form a fixed connection between the upper tubing and the upper outer cylinder 4. The reconnection is then complete. Figure 11 .
[0081] (6) Well opening status after reconnection:
[0082] When opening and closing the bypass after reconnection, only pressurization is needed in the wellbore. At this time, the upper fracturing disc 33 ruptures, and the annular pressure enters the downward motion drive chamber. The annular pressure acts on the upper working 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 sealing isolation. Figure 12 The shear mandrel 5 continues to move to the right until the lower working 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°, causing it to... Figure 11 The closed state becomes Figure 12 Open. At this point, all tool actions are complete.
[0083] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A reconnectable differential pressure remote-controlled downhole plugging valve, characterized in that, include: The outer cylinder has a first bypass hole (23) on its side wall, the top of the outer cylinder is detachably connected to a release assembly or a reconnection assembly, and the bottom of the outer cylinder is provided with a ball valve assembly. A shearing mandrel (5) is fixed inside the outer cylinder by a shearing pin (32). The side wall of the shearing mandrel (5) is provided with a second bypass hole (24). A first boss (25) and a second boss (27) are provided at intervals on the outer circular surface (26) of the shearing mandrel (5). The area of the upper working surface of the first boss (25) is greater than the area of the lower working surface of the second boss (27). The lower rupture disc (34) is disposed on the outer cylinder to isolate the annulus and the lower working surface of the second boss (27). After the lower rupture disc (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. The upper rupture disc (33) is disposed on the outer cylinder to isolate the annulus and the upper working surface of the first boss (25). After the upper rupture disc (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 misaligned, and the ball valve assembly is opened.
2. The reconnectable differential pressure remote-controlled downhole plugging valve according to claim 1, characterized in that, The outer cylinder includes an upper outer cylinder (4), a lower outer cylinder (6), and a ball valve outer cylinder (8) that are connected sequentially from top to bottom and 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 located inside the ball valve outer cylinder (8). The first bypass hole (23) is located on the side wall of the upper outer cylinder (4). 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 differential pressure remote-controlled 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 working surfaces of the first boss (25) can respectively abut against the bottom end of the upper outer cylinder (4) and the lower limiting step to limit the movement.
4. The reconnectable differential pressure remote-controlled downhole plugging valve according to claim 2, characterized in that, The release component includes: Disengagement connector (1); Release spindle (2), the top end of the release spindle (2) is threadedly connected to the release connector (1), the outer wall of the release spindle (2) is provided with a first limiting step (20) and a first spline (21), the bottom end of the release spindle (2) is inserted into the upper outer cylinder (4) and can slide and extend within the upper outer cylinder (4); A left-handed nut (3) is keyed to the release spindle (2), which 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), which can transmit torque when the first spline (21) and the second spline (22) mesh.
5. The reversible differential pressure remote-controlled downhole plugging valve according to claim 2, characterized in that, The reconnection assembly includes: Reconnector (15); A return mandrel (17) is threaded to the return connector (15) at its top end, and the bottom end of the return mandrel (17) is inserted into the upper outer cylinder (4). Return claw (16), the return claw (16) is sleeved on the return mandrel (17) and threaded to the upper outer cylinder (4); A combined seal (18) is sleeved on the reconnection mandrel (17). When the bottom end of the reconnection mandrel (17) is inserted into the upper outer cylinder (4), the combined seal (18) is sandwiched between the reconnection mandrel (17) and the upper outer cylinder (4) to seal.
6. The reversible differential pressure remote-controlled downhole plugging valve according to claim 5, characterized in that, The bottom end of the reconnecting spindle (17) is provided with a guide joint (19), and the upper and lower ends of the combined seal (18) abut against the outer wall of the reconnecting spindle (17) and the guide joint (19), respectively.
7. The reversible differential pressure remote-controlled downhole plugging valve according to claim 2, characterized in that, The ball valve assembly includes: The elastic claw (7) has its top end inserted into the gap between the shearing mandrel (5) and the lower outer cylinder (6). The bottom end of the elastic claw (7) is sequentially connected to a connecting short section (9) and an operating pin (12). When the shearing mandrel (5) moves, it can drive the elastic claw (7) to move. Ball seat short section (13), which is connected to the outer cylinder (8) of the ball valve; A ball valve assembly (11) is located at the top of the ball seat 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. The operating pin (12) drives the ball valve assembly (11) to open or close.
8. The reversible differential pressure remote-controlled downhole plugging valve according to claim 7, characterized in that, The outer cylinder also includes a lower connector (14), which is threadedly connected to the outer cylinder (8) of the ball valve, and the ball seat short section (13) is threadedly connected to the lower connector (14).
9. The reversible differential pressure remote-controlled 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), which is inserted into the operating hole (30).
10. The reversible differential pressure remote-controlled 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).