Bidirectional pressure activated crush valve

Abstract

The application discloses a bidirectional pressure-bearing trigger crush valve, which comprises an upper joint, a body and a lower joint, a valve seat is arranged on a middle step of the inner periphery of the body, an upper arch valve flap is arranged on the valve seat, a striker is arranged outside the valve seat and the upper arch valve flap, a piston sleeve is arranged on the upper end of the striker, and a fixing sleeve is further arranged between the piston sleeve and the upper arch valve flap; a lower arch valve flap is arranged between the lower step of the inner periphery of the body and the lower joint; a screw is arranged on the side wall of the piston sleeve, and the rupture disc is pressed in the hole of the piston sleeve through the screw. The rupture disc is broken by the internal pressure of the tool, the internal liquid is transmitted to the piston sleeve through the screw, the lower part of the piston sleeve is driven to move downward along the inclined surface of the outer periphery of the top of the striker, the top of the striker presses the upper arch valve flap to break it, the pressure is transmitted to the inner cavity of the lower arch valve flap to break it, and the tool is internally through, thereby providing a channel for oil and gas migration. The application can bear pressure in two directions, can effectively prevent the leakage of completion fluid, can prevent blowout, the opening mode of the rupture disc is stable, and the pressure control is reliable.

Description

Technical Field

[0001] This invention relates to the field of downhole equipment technology, and in particular to a bidirectional pressure-triggered crushing valve. Background Technology

[0002] During the drilling, completion, and subsequent workover processes of oil wells, completion fluid loss is a frequent problem: during the drilling and completion phase, drilling into easily leaky formations often leads to a large loss of drilling mud; during the workover phase, formation depletion and pressure drop caused by long-term oil well production can also cause completion fluid loss, and the kill fluid may also contaminate the reservoir during the transition from completion to production.

[0003] To address this issue, reservoir protection is crucial. During well workover and completion operations, constructing safe and reliable isolation and sealing measures can improve operational efficiency, maximize oil and gas recovery, and prevent reservoir fluid loss. Therefore, production tubing is typically equipped with formation isolation tools. These tools effectively isolate the upper reservoir within the wellbore and isolate the working section separately, thereby reducing the damage to the reservoir from fluids within the wellbore and ultimately improving the economic benefits of well development. In terms of structural type, commonly used formation isolation tools mainly consist of plate valves and ball valves. Plate valves are mostly made of ceramic or glass and are broken by pressure within the tubing. Due to variations in materials produced in each batch, the breaking pressure is unstable and difficult to control. Ball valves, on the other hand, have a rapid opening and closing stroke and require high media cleanliness. Impurities can easily cause the ball to become stuck, affecting the flexibility of opening and closing. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the present invention provides a bidirectional pressure-triggered crushing valve.

[0005] The present invention is achieved by the following technical solution.

[0006] A bidirectional pressure-triggered crushing valve includes an upper connector, a body, and a lower connector connected in sequence. A valve seat is provided on a step in the middle of the inner circumference of the body, and an upper arched valve disc is provided on the valve seat. A striking pin is provided outside the valve seat and the upper arched valve disc. A piston sleeve is provided on the outer side of the upper end of the striking pin. A fixing sleeve is also provided between the piston sleeve and the upper arched valve disc. A lower arched valve disc is provided between the lower step in the inner circumference of the body and the lower connector. A hollow screw is provided on the side wall of the piston sleeve, and the crushing disc is pressed into the hole of the piston sleeve by the screw.

[0007] Furthermore, the upper connector is connected to the body by a thread, and a sealing ring and a first fixing pin are provided between them.

[0008] Furthermore, the main body and the lower connector are connected by threads, and a sealing ring and a second fixing pin are provided between them.

[0009] Furthermore, the outer periphery of the main body is provided with two threaded holes for installing a first plug and a second plug, respectively. The threaded hole for installing the first plug is located at the location of the screw on the piston sleeve, and the threaded hole for installing the second plug is located at the valve seat and the lower end of the striker.

[0010] Furthermore, a sloping surface is formed on the lower part of the inner circumference of the piston sleeve, which is adapted to the sloping surface on the outer circumference of the top of the firing pin.

[0011] Furthermore, the lower outer diameter of the fixed sleeve is larger than the upper outer diameter.

[0012] Furthermore, there are two striking pins, which are assembled and installed on the outside of the valve seat; the top of the striking pin is an elastic claw, the bottom of the inner circumference of the striking pin is a hook structure, the lower middle part of the inner circumference is a groove, and the bottom hook structure and the inner circumference groove are adapted to the outer circumference of the valve seat.

[0013] Furthermore, the upper arched valve flap has the same structure as the lower arched valve flap, with a hemispherical protrusion on the outer periphery, a cylindrical structure in the middle, and a hollow hemispherical cylindrical cavity inside.

[0014] Furthermore, the upper part of the inner circumference of the lower connector is provided with an arc surface that matches the outer spherical surface of the lower arch valve disc.

[0015] Furthermore, the rupture disc is in the shape of a disc.

[0016] This application has the following beneficial effects: (1) The upper and lower arch valve flaps of the present invention are both hemispherical protrusion structures, which can bear pressure in both directions, effectively preventing the loss of completion fluid and preventing blowout; (2) The present invention uses a high-pressure crushing disc to push the piston sleeve down to crush the upper arch valve disc, and then uses high pressure to crush the lower arch valve disc to achieve the internal channel connection. The crushing disc opening mode is stable and the pressure control is reliable. (3) The present invention can use wire rope or continuous tubing to lower the breaking tool to break the upper and lower arch valve discs, realize the full bore of the tool, and provide a channel for oil and gas migration. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the firing pin structure of the present invention.

[0018] The components are as follows: 1. Upper connector; 2. Body; 3. Lower connector; 4. Piston sleeve; 5. Fixing sleeve; 6. Upper arched valve disc; 7. Impact pin; 8. Valve seat; 9. Lower arched valve disc; 10. Rupture disc; 11. Screw; 12. First plug; 13. Second plug; 14. First fixing pin; 15. Second fixing pin; 16. First sealing ring; 17. Second sealing ring; 18. Third sealing ring; 19. Fourth sealing ring; 20. Fifth sealing ring; 21. Sixth sealing ring; 22. Seventh sealing ring. Detailed Implementation

[0019] The present patent application will be further described below with reference to the embodiments. Unless otherwise specified, the materials used in the preparation process in the following embodiments have not undergone further processing and have been commercially available.

[0020] like Figure 1-2 As shown, a bidirectional pressure-triggered crushing valve mainly comprises an upper connector 1, a body 2, a piston sleeve 4, a fixed sleeve 5, a striking pin 7, an upper arched valve disc 6, a valve seat 8, a lower arched valve disc 9, a lower connector 3, a plug, a screw 11, a fixing pin, and a rupture disc 10.

[0021] The upper connector 1, body 2, piston sleeve 4, fixed sleeve 5, valve seat 8, and lower connector 3 are all hollow cylindrical structures.

[0022] The upper connector 1, body 2, and lower connector 3 are sequentially threaded together. The top of the upper connector 1 and the bottom of the lower connector 3 are respectively provided with threads for connecting with other tools. The piston sleeve 4, fixed sleeve 5, upper arched valve disc 6, striking pin 7, and valve seat 8 are sequentially arranged on the middle step of the inner circumference of the body 2. The lower arched valve disc 9 is arranged between the lower step of the inner circumference of the body 2 and the lower connector 3. The fixed sleeve 5 is inside the piston sleeve 4 and between the upper arched valve disc 6. The striking pin 7 is arranged between the fixed sleeve 5 and the valve seat 8, and its top is located between the lower part of the inner circumference of the piston sleeve 4 and the upper arched valve disc 6. The screw 11 is a hollow cylindrical structure and is arranged in the threaded hole on the outer circumference of the piston sleeve 4. The first plug 12 is installed on the outer circumference of the body 2 corresponding to the position of the screw 11. The second plug 13 is installed in the middle of the outer circumference of the body 2. The first fixing pin 14 and the second fixing pin 15 are respectively installed at the upper and lower ends of the body 2.

[0023] A first sealing ring 16 is provided between the outer periphery of the upper connector 1 and the inner periphery of the body 2, and a second sealing ring 17 is provided between the outer periphery of the lower connector 3 and the inner periphery of the body 2; a third sealing ring 18 is provided between the inner periphery of the upper connector 1 and the top of the piston sleeve 4, a fourth sealing ring 19 is provided between the outer periphery of the piston sleeve 4 and the inner periphery of the body 2, a fifth sealing ring 20 is provided between the outer periphery of the fixed sleeve 5 and the inner periphery of the piston sleeve 4, a sixth sealing ring 21 is provided between the outer periphery of the upper arch valve disc 6 and the inner periphery of the fixed sleeve 5, and a seventh sealing ring 22 is provided between the outer periphery of the lower arch valve disc 9 and the inner periphery of the body 2.

[0024] The lower outer periphery of the upper connector 1 is provided with a groove for installing the first sealing ring 16, and the middle outer periphery is provided with an external thread for connecting to the upper end of the body 2.

[0025] The body 2 has internal threads at both ends, two threaded holes for installing plugs in the middle of the outer circumference, two steps for receiving valve seat 8 in the middle of the inner circumference, and a step for receiving lower arch valve disc 9 in the lower part of the inner circumference.

[0026] The piston sleeve 4 has a groove for installing the third sealing ring 18 on the upper part of its outer periphery, a step in the middle of its outer periphery, a stepped threaded hole for installing the screw 11 below the outer periphery step, a groove for installing the fourth sealing ring 19 below the outer periphery threaded hole, a sloping surface in the lower part of its inner periphery, an inner diameter larger than the middle part, and a step in the middle of its inner periphery.

[0027] The outer diameter of the lower part of the outer periphery of the fixed sleeve 5 is larger than that of the upper part, and the upper part of the outer periphery and the lower part of the inner periphery are respectively provided with grooves for installing the fifth sealing ring 20 and the sixth sealing ring 21.

[0028] The top of the firing pin 7 is an elastic claw, and the outer periphery of the top is an inclined surface adapted to the lower slope of the inner periphery of the piston sleeve 4. The bottom of the inner periphery is a hook structure, and the lower middle part of the inner periphery is a groove. There are two firing pins 7, which are joined together to form a cylindrical structure and installed on the outside of the valve seat 8. The groove on the inner periphery is adapted to the protrusion in the middle of the outer periphery of the valve seat 8, and the hook structure at the bottom is adapted to the groove in the middle of the outer periphery of the valve seat 8. The bottom of the hook structure is in contact with the lower middle step of the outer periphery of the valve seat 8. The valve seat 8 has a protrusion in the middle of the outer periphery, and below the protrusion is a groove adapted to the hook of the firing pin 7. The lower middle part of the outer periphery is a step that contacts the firing pin 7, and the lower part of the outer periphery is a variable diameter step that contacts the secondary step in the middle of the inner periphery of the body 2.

[0029] The upper arched valve flap 6 and the lower arched valve flap 9 have the same structure. The outer periphery is a hemispherical protrusion, the middle part is a cylindrical structure, and the interior is a hollow hemispherical cylindrical cavity. The material will break under compression or high pressure in the inner cavity.

[0030] The lower connector 3 has an external thread on its upper part that connects to the body 2, a groove on the top of its outer periphery for installing the second sealing ring 17, and an arc surface on the upper part of its inner periphery that matches the spherical surface of the lower arch valve disc 9.

[0031] The rupture disc 10 is a circular disc, and its material will break under the set pressure. It is installed between the screw 11 and the piston sleeve 4, and the screw 11 is used to press the rupture disc 10 into the piston sleeve hole.

[0032] This invention is installed below the top packer. After the tool is lowered to the designated position, the packer is set by pressurizing the tubing string. Well completion is then performed. After completion, pressurization continues, and the internal pressure of the tool continuously increases. When the pressure reaches the breaking pressure of the fracture plate 10, the internal fluid is transmitted to the piston sleeve 4 via the screw 11. The pressure between the body 2 and the piston sleeve 4 is greater than that at the lower part of the piston sleeve 4, pushing the lower part of the piston sleeve 4 downwards along the outer circumferential slope of the top of the striking pin 7. The elastic claw at the top of the striking pin 7 is compressed, pressing and breaking the bottom of the upper arch valve 6. The pressure continues to be transmitted to the inner cavity of the lower arch valve 9, breaking it as well. The tool's interior is thus opened, providing a channel for oil and gas migration. If the internal pressure of the tool is insufficient to break the fracture plate 10, the tool can be lowered using wireline work or coiled tubing to break the upper and lower arch valves 9, opening the valve body and providing a channel for oil and gas migration.

[0033] 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 bidirectional pressure-triggered crushing valve, comprising an upper connector (1), a body (2), and a lower connector (3) connected in sequence, characterized in that: A valve seat (8) is provided on the middle step of the inner circumference of the body (2). An upper arched valve disc (6) is provided on the valve seat (8). A striker (7) is provided outside the valve seat (8) and the upper arched valve disc (6). A piston sleeve (4) is provided on the outer side of the upper end of the striker (7). A fixing sleeve (5) is also provided between the piston sleeve (4) and the upper arched valve disc (6). A lower arched valve disc (9) is provided between the lower step of the inner circumference of the body (2) and the lower connector (3). A hollow screw (11) is provided on the side wall of the piston sleeve (4). The rupture disc (10) is pressed into the piston sleeve hole by the screw (11).

2. The bidirectional pressure-bearing triggered crushing valve according to claim 1, characterized in that: The upper connector (1) is connected to the body (2) by a thread, and a sealing ring and a first fixing pin (14) are provided between them.

3. The bidirectional pressure-bearing triggered crushing valve according to claim 1, characterized in that: The main body (2) and the lower connector (3) are connected by threads, and a sealing ring and a second fixing pin (15) are provided between them.

4. The bidirectional pressure-bearing triggered crushing valve according to claim 1, characterized in that: The outer periphery of the body (2) is provided with two threaded holes for installing the first plug (12) and the second plug (13) respectively. The setting position of the threaded hole for installing the first plug (12) corresponds to the setting position of the screw (11) on the piston sleeve (4). The threaded hole for installing the second plug (13) is located at the lower end of the valve seat (8) and the striker (7).

5. The bidirectional pressure-bearing triggered crushing valve according to claim 1, characterized in that: The lower part of the inner circumference of the piston sleeve (4) forms a slope surface, which is adapted to the slope surface of the outer circumference of the top of the firing pin (7).

6. The bidirectional pressure-bearing triggered crushing valve according to claim 1, characterized in that: The lower outer diameter of the fixed sleeve (5) is greater than the upper outer diameter.

7. A bidirectional pressure-bearing triggered crushing valve according to claim 1, characterized in that: The number of the striker (7) is two. The two strikers (7) are assembled and installed on the outside of the valve seat (8). The top of the striker (7) is an elastic claw, the bottom of the inner circumference of the striker (7) is a hook structure, and the lower middle part of the inner circumference is a groove. The bottom hook structure and the inner circumference groove are adapted to the outer circumference of the valve seat (8).

8. The bidirectional pressure-bearing triggered crushing valve according to claim 1, characterized in that: The upper arch valve flap (6) has the same structure as the lower arch valve flap (9), with a hemispherical protrusion on the outer periphery, a cylindrical structure in the middle, and a hollow hemispherical cylindrical cavity inside.

9. A bidirectional pressure-bearing triggered crushing valve according to claim 1, characterized in that: The upper part of the inner circumference of the lower connector (3) is provided with an arc surface that matches the outer spherical surface of the lower arch valve disc (9).

10. A bidirectional pressure-triggered crushing valve according to claim 1, characterized in that: The rupture disc (10) is in the shape of a disc.

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