Underground safety valve
By designing blowout preventing parts in the downhole safety valve, the problem of poor return safety of oil and gas in the existing downhole safety valve is solved, effectively preventing backflow of oil and gas, and improving the safety of the safety valve.
Patent Information
- Application Number
- CN202510667275.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-22
- Publication Date
- 2025-06-20
AI Technical Summary
The existing downhole safety valves have poor safety in oil and gas return, resulting in oil and gas returning to the first inner pipe easily, affecting safety.
An underground safety valve is designed, and a blowout-proof member is used to swing and connect it in the first outer pipe, which can cover the first pipe in a natural state, and open the first pipe when the first inner pipe moves, so as to realize communication with the second pipe and prevent oil and gas from flowing back.
Through the design of blowout preventing parts, the oil and gas from the second docking pipe is prevented from flowing back to the first inner pipe, and the safety of the downhole safety valve is improved.
Smart Images
Figure CN120175274A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of downhole safety valves, and in particular, to a downhole safety valve. Background Art
[0002] With the development of technology, downhole safety valves are applied in industry. A downhole safety valve is a special valve in which the closing member is in a normally open state under the action of an external force. When the pressure of the medium in the pipeline rises above a specified value, the medium is discharged to the outside of the system to prevent the pressure of the medium in the pipeline from exceeding the specified value.
[0003] In the prior art, the existing downhole safety valve includes a first docking pipe and a second docking pipe. The first docking pipe includes a first outer pipe and a first inner pipe; the first outer pipe and the first inner pipe are communicated; the first outer pipe is used for docking an oil pipe; the first inner pipe is movably sleeved inside the first outer pipe and moves downward under external injection pressure. The second docking pipe docks with the first docking pipe, and the channel of the second docking pipe is communicated with the first inner pipe. However, the oil and gas in the second docking pipe easily flow back to the first inner pipe, resulting in poor safety of the existing downhole safety valve. Summary of the Invention
[0004] The purpose of the present invention is to provide a downhole safety valve. The first docking pipe includes a first outer pipe and a first inner pipe; the first outer pipe and the first inner pipe are communicated; the first outer pipe is used for docking an oil pipe; the first inner pipe is movably sleeved inside the first outer pipe and moves downward under external injection pressure; an anti-blowout member is provided inside the first outer pipe. The anti-blowout member is swingably connected to the first outer pipe and can open or cover the first pipe of the first inner pipe; the second docking pipe docks with the first docking pipe, and the second docking pipe is provided with a second pipe; at this time, the anti-blowout member covers the first pipe in a natural state, so that the first pipe and the second pipe are independent of each other, and the oil and gas gushing out of the well through the second pipe are blocked; the anti-blowout member opens the first pipe as the first inner pipe moves, so that the first pipe is communicated with the second pipe, achieving an anti-blowout effect, avoiding the oil and gas in the second docking pipe from flowing back to the first inner pipe, and improving the safety of the downhole safety valve.
[0005] To achieve the above object, the present invention provides the following technical solution: A downhole safety valve for docking an oil pipe, the downhole safety valve comprising: A first docking pipe, including a first outer pipe and a first inner pipe; the first outer pipe and the first inner pipe are communicated; the first outer pipe is used for docking an oil pipe; the first inner pipe is movably sleeved inside the first outer pipe and moves downward under external injection pressure; an anti-blowout member is provided inside the first outer pipe. The anti-blowout member is swingably connected to the first outer pipe and can open or cover the first pipe of the first inner pipe; A second docking pipe, docking with the first docking pipe, the second docking pipe being provided with a second pipe; At this time, the anti-blowout component covers the first pipeline in a natural state, so that the first pipeline and the second pipeline are independent, and blocks the oil and gas that blows out through the second pipeline; the anti-blowout component opens the first pipeline as the first inner tube moves, so that the first pipeline is connected to the second pipeline.
[0006] Optionally, the first inner tube is inside the first outer tube; The blowout prevention component is hinged to the end of the first outer tube and elastically swings relative to the end of the first outer tube; the blowout prevention component rebounds under the elastic force, one surface of the blowout prevention component seals the first pipeline, and the other surface of the blowout prevention component blocks the oil and gas that blows out through the second pipeline.
[0007] Optionally, the blowout prevention member is hinged to the end of the first outer tube via a rotating shaft; The rotating shaft sleeve is provided with a torsion spring, one end of the torsion spring elastically abuts against the end of the first outer tube, and the other end of the torsion spring elastically abuts against the anti-blowout component and applies a rebound force to the anti-blowout component; The impact force of the oil and gas input through the first inner tube is smaller than the rebound force applied by the torsion spring to the anti-blowout component, so that a surface of the anti-blowout component covers the first pipeline.
[0008] Optionally, the end of the first outer tube is provided with a first spherical surface, The blowout prevention component is provided with a second spherical surface, and the second spherical surface is in contact with the first spherical surface when the blowout prevention component covers the first inner tube; the second spherical surface and the first spherical surface are both arranged in a ring shape.
[0009] Optionally, a first tube body and a first mounting seat are provided at the end of the first outer tube; The first mounting seat is mounted on the first pipe body, and the blowout prevention member is hinged to the first mounting seat and is located inside the first mounting seat; A non-metallic sealing ring is provided between the first tube body and the first mounting seat, the non-metallic sealing ring is provided with a first step portion and a second step portion, and the first step portion and the second step portion are connected; The first step portion is plugged into the first tube body, and the second step portion can be plugged into the first mounting seat.
[0010] Optionally, the inner side wall of the non-metallic sealing ring is provided with a third spherical surface, the third spherical surface is opposite to the second spherical surface, and can be squeezed by the first spherical surface in a sealing manner; When the blowout prevention member covers the first inner tube, the second spherical surface contacts the first spherical surface and the third spherical surface simultaneously.
[0011] Optionally, the first pipe body is provided for the first inner pipe to pass through; The inner side wall of the first pipe body is provided with a sand passing groove, which is arranged along the length direction of the first pipe body and is concave inward; the sand passing groove is used for accommodating sand, and the bottom of the inner side wall of the sand passing groove is arranged in an arc shape; When the first inner pipe moves relative to the first pipe body, a receiving space is formed between the outer side wall of the first inner pipe and the inner side wall of the sand passing groove, and the sand is in the receiving space to prevent the first inner pipe from being engaged with the first pipe body.
[0012] Optionally, a pressure injection port and a first moving pipe are arranged in the first outer pipe. The first moving pipe is on one side of the pressure injection port, and the pressure injection port is connected to an external pressure injection component; The first moving pipe can move in the first outer pipe, and one end of the first moving pipe away from the pressure injection port is connected to the first inner pipe; When an external pressure injection component injects pressure into the pressure injection port, the first moving pipe moves relative to the first outer pipe under the action of the injection pressure, and applies a moving force to the first inner pipe, so that the first inner pipe gradually approaches the blowout preventer until the first inner pipe opens the blowout preventer.
[0013] Optionally, a second moving pipe and a spring are arranged between the first inner pipe and the first outer pipe. The second moving pipe movably passes through the first outer pipe and contacts the first inner pipe; The spring is between the second moving pipe and the first outer pipe and can apply a resilient force to the second moving pipe; When the external pressure injection component relieves the pressure of the pressure injection port, the spring applies a resilient force to the second moving pipe. Under the action of this resilient force, the second moving pipe drives the first inner pipe to move and gradually move away from the blowout preventer, and the blowout preventer gradually covers the first inner pipe.
[0014] Optionally, the blowout preventer is arranged in the form of a sealing cover.
[0015] Compared with the prior art, the beneficial effects of the present invention are: The present invention provides a downhole safety valve. The first docking pipe includes a first outer pipe and a first inner pipe; the first outer pipe and the first inner pipe are in communication; the first outer pipe is used for docking with an oil pipe; the first inner pipe is movably sleeved inside the first outer pipe and moves downward under external injection pressure; an anti-blowout member is provided inside the first outer pipe, and the anti-blowout member is swingably connected to the first outer pipe and can open or cover a first pipe of the first inner pipe; a second docking pipe docks with the first docking pipe, and the second docking pipe is provided with a second pipe; at this time, the anti-blowout member covers the first pipe in a natural state, so that the first pipe and the second pipe are independent of each other, and blocks the oil and gas gushing out through the second pipe; the anti-blowout member opens the first pipe as the first inner pipe moves, so that the first pipe communicates with the second pipe, achieving the anti-blowout effect, avoiding the oil and gas of the second docking pipe from flowing back into the first inner pipe, and improving the safety of the downhole safety valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.
[0017] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. Among them, the same reference numerals in the following description represent the same parts.
[0018] Figure 1 FIG. shows a schematic diagram of a downhole safety valve according to an embodiment of the present application.
[0019] Figure 2 FIG. shows a cross-sectional view of a downhole safety valve according to an embodiment of the present application.
[0020] Figure 3 FIG. shows Figure 1 a partial enlarged view of part A in
[0021] Figure 4 FIG. shows an exploded view of a downhole safety valve according to an embodiment of the present application.
[0022] Figure 5 FIG. shows Figure 4 a cross-sectional view in
[0023] Figure 6 FIG. shows a schematic diagram of the internal structure of a downhole safety valve according to an embodiment of the present application.
[0024] REFERENCE NUMERALS 100, downhole safety valve; 10. First docking pipe; 11. First outer pipe; 11a. First spherical surface; 11b. Injection port; 11c. Wire groove; 111. Blowout preventer; 111a. Second spherical surface; 112. Rotating shaft; 1121. Torsion spring; 113. First pipe body; 114. First mounting seat; 115. Non-metallic sealing ring; 115a. Third spherical surface; 1151. First step portion; 1152. Second step portion; 116. First moving pipe; 12. First inner pipe; 12a. First pipeline; 13. Second moving pipe; 14. Spring; 15. Wave spring; 16. Bearing 20. Second docking pipe; 20a. Second pipeline Specific embodiments
[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application
[0026] Please refer to the atta Figures 1 to 6 chments. An underground safety valve 100 is provided in an embodiment of the present application. The underground safety valve 100 is used to dock with an oil pipe and achieve a blowout prevention effect on the oil and gas in the oil pipe
[0027] Please refer to the atta Figures 1 to 6 chments. In an embodiment of the present application, the underground safety valve 100 includes a first docking pipe 10 and a second docking pipe 20. The first docking pipe 10 includes a first outer pipe 11 and a first inner pipe 12. The first outer pipe 11 and the first inner pipe 12 are connected and communicate with each other. The first outer pipe 11 is used to dock with an oil pipe. The first inner pipe 12 is movably sleeved inside the first outer pipe 11 and moves downward under external injection pressure. A blowout preventer 111 is provided inside the first outer pipe 11. The blowout preventer 111 is swingably connected to the first outer pipe 11 and can open or cover the first pipeline 12a of the first inner pipe 12. The second docking pipe 20 docks with the first docking pipe 10, and the second docking pipe 20 is provided with a second pipeline 20a. At this time, the blowout preventer 111 covers the first pipeline 12a in the natural state, so that the first pipeline 12a and the second pipeline 20a are independent of each other and block the oil and gas gushing out through the second pipeline 20a. The blowout preventer 111 opens the first pipeline 12a as the first inner pipe 12 moves, so that the first pipeline 12a communicates with the second pipeline 20a, achieving the blowout prevention effect, avoiding the backflow of the oil and gas in the second docking pipe 20 to the first inner pipe 12, and improving the safety of the underground safety valve 100
[0028] Please refer to the atta Figures 1 to 6, in the embodiment of the present application, the first docking pipe 10 includes a first outer pipe 11 and a first inner pipe 12; the first outer pipe 11 is arranged in the vertical direction, the first inner pipe 12 is arranged inside the first outer pipe 11, and the first outer pipe 11 and the first inner pipe 12 are communicated; the first outer pipe 11 is used to dock with the oil pipe, so that the oil and gas of the oil pipe flow through the first outer pipe 11 to the first inner pipe 12, thereby facilitating the transfer of the oil and gas of the oil pipe to the first inner pipe 12. The first inner pipe 12 is movably sleeved inside the first outer pipe 11 and moves downward under external injection pressure to facilitate adjusting the position of the first inner pipe 12 relative to the first outer pipe 11; a blowout preventer 111 is arranged inside the first outer pipe 11, and the blowout preventer 111 is swingably connected to the first outer pipe 11 to facilitate adjusting the position of the blowout preventer 111 relative to the first outer pipe 11, and the blowout preventer 111 can open or cover the first pipe 12a of the first inner pipe 12.
[0029] The second docking pipe 20 is arranged below the first docking pipe 10, the second docking pipe 20 docks with the first docking pipe 10, and the second docking pipe 20 is provided with a second pipe 20a; at this time, the blowout preventer 111 covers the first pipe 12a in the natural state, so that the first pipe 12a and the second pipe 20a are independent of each other, and blocks the oil and gas gushing out through the second pipe 20a; the blowout preventer 111 opens the first pipe 12a as the first inner pipe 12 moves, so that the first pipe 12a is communicated with the second pipe 20a, achieving the blowout prevention effect, avoiding the oil and gas of the second docking pipe 20 from flowing back to the first inner pipe 12, and improving the safety of the downhole safety valve 100.
[0030] Please refer to the appendix Figures 1 to 3 , in the embodiment of the present application, the first inner pipe 12 is inside the first outer pipe 11; the blowout preventer 111 is hinged to the end of the first outer pipe 11 to facilitate the blowout preventer 111 to swing relative to the first outer pipe 11 in a hinged manner, and the blowout preventer 111 elastically swings relative to the end of the first outer pipe 11; the blowout preventer 111 rebounds under the elastic force, one surface of the blowout preventer 111 covers the first pipe 12a, and the other surface of the blowout preventer 111 blocks the oil and gas gushing out through the second pipe 20a, so that the blowout preventer 111 covers the first pipe 12a under the elastic force, thereby facilitating the blowout preventer 111 to always cover the first pipe 12a without external force, so as to make the first pipe 12a independent of the second pipe 20a, avoid the oil and gas of the second pipe 20a from flowing back to the first pipe 12a, and improve the safety of the downhole safety valve 100.
[0031] Please refer to the appendix Figures 1 to 3, in the embodiment of the present application, the blowout preventer 111 is hinged to the end of the first outer pipe 11 through a rotating shaft 112; the blowout preventer 111 swings relative to the first outer pipe 11 along the axial direction of the rotating shaft 112. A torsion spring 1121 is sleeved on the rotating shaft 112. One end of the torsion spring 1121 elastically abuts against the end of the first outer pipe 11, and the other end of the torsion spring 1121 elastically abuts against the blowout preventer 111 and applies a resilient force to the blowout preventer 111; so that the blowout preventer 111 can be closed relative to the first pipe 12a through the torsion spring 1121. The impact force of the oil and gas input through the first inner pipe 12 is less than the resilient force applied by the torsion spring 1121 to the blowout preventer 111, so that one surface of the blowout preventer 111 covers the first pipe 12a, facilitating the independence of the first pipe 12a and the second pipe 20a, preventing the oil and gas of the second docking pipe 20 from flowing back to the first inner pipe 12, and improving the safety of the downhole safety valve 100.
[0032] Please refer to the appendix Figures 1 to 3 , in the embodiment of the present application, a first spherical surface 11a is provided at the end of the first outer pipe 11, and a second spherical surface 111a is provided on the blowout preventer 111. The second spherical surface 111a is docked with the first spherical surface 11a when the blowout preventer 111 covers the first inner pipe 12; both the second spherical surface 111a and the first spherical surface 11a are arranged in a ring shape, so as to increase the contact area between the first spherical surface 11a and the second spherical surface 111a, thereby facilitating the tight fit between the first spherical surface 11a and the second spherical surface 111a to form a complete sealing surface, with better spherical sealing effect, effectively preventing the oil and gas of the first pipe 12a and the second pipe 20a from flowing from the connection between the second spherical surface 111a and the first spherical surface 11a, improving the sealing performance between the blowout preventer 111 and the first outer pipe 11, and at the same time, preventing the occurrence of blowout accidents.
[0033] Please refer to the appendix Figures 4 to 6, in the embodiment of the present application, a first pipe body 113 and a first mounting seat 114 are provided at the end of the first outer pipe 11; the first mounting seat 114 is mounted on the first pipe body 113, and the blowout preventer 111 is hinged to the first mounting seat 114 and is located within the first mounting seat 114; so that the blowout preventer 111 can swing relative to the first mounting seat 114 by means of hinging, thereby facilitating the blowout preventer 111 to swing relative to the first outer pipe 11 through the first mounting seat 114. A non-metallic sealing ring 115 is provided between the first pipe body 113 and the first mounting seat 114. The non-metallic sealing ring 115 is provided with a first step portion 1151 and a second step portion 1152, the first step portion 1151 and the second step portion 1152 are arranged in opposite directions, and the first step portion 1151 and the second step portion 1152 are connected; the first step portion 1151 is inserted into the first pipe body 113, and the second step portion 1152 can be inserted into the first mounting seat 114, so that the non-metallic seal can be connected to the first pipe body 113 and the first mounting seat 114 respectively through the first step portion 1151 and the second step portion 1152, thereby facilitating the first mounting seat 114 to be hermetically connected to the first pipe body 113 through the non-metallic sealing ring 115, ensuring the sealing effect between the first pipe body 113 and the first mounting seat 114, and preventing oil and gas from flowing through the connection between the first pipe body 113 and the first mounting seat 114.
[0034] The non-metallic sealing ring 115 is designed as a curved surface structure with different thicknesses, making full use of the space between the first pipe body 113 and the first mounting seat 114 to ensure that the blowout preventer 111, the first pipe body 113 and the first mounting seat 114 are all sealed, better playing a double-sealing role. Moreover, the first step portion 1151 and the second step portion 1152 of the non-metallic sealing ring 115 are embedded in the grooves of the first pipe body 113 and the first mounting seat 114, so that the non-metallic sealing ring 115 cannot rotate, achieving better positioning. At the same time, even if the blowout preventer 111 is opened or blocked repeatedly for many times, the non-metallic sealing ring 115 will not fall off, improving the operation reliability. Optionally, the first pipe body 113 and the first mounting seat 114 are connected by pins, improving the position accuracy of the first mounting seat 114 relative to the first pipe body 113.
[0035] Please refer to the appendix Figures 1 to 3, in the embodiment of the present application, the inner side wall of the non-metallic sealing ring 115 is provided with a third spherical surface 115a, and the third spherical surface 115a is relative to the second spherical surface 111a and can be hermetically squeezed by the first spherical surface 11a; when the blowout preventer 111 covers the first inner pipe 12, the second spherical surface 111a contacts the first spherical surface 11a and the third spherical surface 115a at the same time, so as to increase the contact area between the second spherical surface 111a, the first spherical surface 11a and the third spherical surface 115a, so that the close fit between the third spherical surface 115a and the second spherical surface 111a can form a complete sealing surface, effectively preventing the oil and gas of the first pipeline 12a and the second pipeline 20a from flowing from the connection between the second spherical surface 111a and the third spherical surface 115a, further improving the sealing performance between the blowout preventer 111, the first pipe body 113 and the first mounting seat 114, and at the same time, preventing the occurrence of blowout accidents.
[0036] The non-metallic sealing ring 115 is made of a high-performance non-elastic material, which has the functions of wear resistance, corrosion resistance and good sealing performance, ensuring good sealing effect even in low-pressure and mud / sand environment.
[0037] Please refer to the appendix Figures 2 to 6 , in the embodiment of the present application, the first pipe body 113 is provided for the first inner pipe 12 to pass through, so that the first inner pipe 12 is located inside the first pipe body 113; the inner side wall of the first pipe body 113 is provided with a sand passing groove, which is arranged along the length direction of the first pipe body 113 and is recessed inward; the sand passing groove is used to accommodate sand, and the bottom of the inner side wall of the sand passing groove is arranged in an arc shape; so that the first pipe body 113 can accommodate sand through the space of the sand passing groove. When the first inner pipe 12 moves relative to the first pipe body 113, a receiving space is formed between the outer side wall of the first inner pipe 12 and the inner side wall of the sand passing groove, and the sand is located in the receiving space to avoid the first inner pipe 12 from being stuck with the first pipe body 113, improving the smoothness of the movement of the first inner pipe 12 relative to the first pipe body 113 and ensuring the movement effect of the first inner pipe 12 relative to the first pipe body 113.
[0038] Please refer to the appendix Figures 2 to 6, in the embodiment of the present application, an injection port 11b and a first moving pipe 116 are provided inside the first outer pipe 11. The first moving pipe 116 is located below the injection port 11b, and the injection port 11b is docked with an external injection member; so that the pressure output by the external injection member is conducted into the first outer pipe 11 through the injection port 11b. The first moving pipe 116 can move inside the first outer pipe 11 to adjust the position of the first moving pipe 116 relative to the first outer pipe 11. One end of the first moving pipe 116 far from the injection port 11b is connected to the first inner pipe 12; when the external injection member injects pressure into the injection port 11b, the first moving pipe 116 moves relative to the first outer pipe 11 under the injection action and applies a moving force to the first inner pipe 12, so that the first moving pipe 116 drives the first inner pipe 12 to move relative to the first outer pipe 11, thereby facilitating the movement effect of the first inner pipe 12, making the first inner pipe 12 gradually approach the blowout preventer 111 until the first inner pipe 12 opens the blowout preventer 111, so as to facilitate the first inner pipe 12 to open the blowout preventer 111 during the downward movement from top to bottom, thereby facilitating the first pipeline 12a to communicate with the second pipeline 20a to enable the oil and gas in the first pipeline 12a to flow to the second pipeline 20a.
[0039] Please refer to the attached Figures 2 to 6 , in the embodiment of the present application, a second moving pipe 13 and a spring 14 are provided between the first inner pipe 12 and the first outer pipe 11. The second moving pipe 13 movably penetrates the first outer pipe 11 to adjust the position of the second moving pipe 13 relative to the first outer pipe 11. The second moving pipe 13 contacts the first inner pipe 12; so that the second moving pipe 13 can drive the first inner pipe 12 to move. The spring 14 is located between the second moving pipe 13 and the first outer pipe 11 and can apply a rebounding force to the second moving pipe 13; when the external injection member relieves pressure on the injection port 11b, the spring 14 applies a rebounding force to the second moving pipe 13, and the second moving pipe 13 drives the first inner pipe 12 to move under this rebounding force, so that the second moving pipe 13 drives the first inner pipe 12 to move upward from bottom to top, and the first inner pipe 12 gradually moves away from the blowout preventer 111, thereby facilitating the first inner pipe 12 to disengage from the blowout preventer 111, and the blowout preventer 111 gradually covers the first inner pipe 12 to make the first pipeline 12a and the second pipeline 20a independent of each other, avoiding the oil and gas in the second docking pipe 20 from flowing back to the first inner pipe 12, and improving the safety of the downhole safety valve 100. Optionally, the blowout preventer 111 is arranged in the form of a sealing cover.
[0040] The inner side walls of the first outer pipe 11 and the second docking pipe 20 are provided with wire grooves 11c for accommodating pipelines. The wire grooves 11c are used to fix the pipelines with a wire pressing device, ensuring the routing of the pipelines, avoiding the pipelines from being entangled with each other. At the same time, it avoids the pipelines from being exposed to the external environment, prevents the pipelines from rubbing against the inner wall of the casing when the safety valve enters the well, plays a role in protecting the pipelines, and also saves space. If the pipelines are exposed to the external environment, it will also affect the aesthetics of the downhole safety valve 100.
[0041] A corrugated spring 15 is provided between the first inner pipe 12 and the second moving pipe 13. The two ends of the corrugated spring 15 are respectively in contact with the first inner pipe 12 and the second moving pipe 13, and the corrugated spring 15 plays a compensation role. When the first inner pipe 12 is fully opened, the lower end of the first inner pipe 12 abuts against the step of the second docking pipe 20, and the first inner pipe 12 and the second docking pipe 20 form a sealing effect. The corrugated spring 15 plays an adjustment role. If the position is not enough, the corrugated spring 15 pushes forward, and if the position is excessive, the corrugated spring 15 retracts.
[0042] A bearing 16 is provided between the first outer pipe 11 and the spring 14. The first outer pipe 11 is connected to the spring 14 through the bearing 16, improving the installation convenience of the spring 14. At the same time, it prevents the spring 14 from rotating.
[0043] Compared with the prior art, the beneficial effects of the present invention are: The present invention provides a downhole safety valve 100. The first docking pipe 10 includes a first outer pipe 11 and a first inner pipe 12; the first outer pipe 11 and the first inner pipe 12 are communicated; the first outer pipe 11 is used for docking with the oil pipe; the first inner pipe 12 is movably sleeved inside the first outer pipe 11 and moves downward under external injection pressure; a blowout preventer 111 is provided inside the first outer pipe 11. The blowout preventer 111 is swingably connected to the first outer pipe 11 and can open or cover the first pipe 12a of the first inner pipe 12; the second docking pipe 20 docks with the first docking pipe 10, and the second docking pipe 20 is provided with a second pipe 20a; at this time, the blowout preventer 111 covers the first pipe 12a in the natural state, making the first pipe 12a and the second pipe 20a independent of each other and blocking the oil and gas gushing through the second pipe 20a; the blowout preventer 111 opens the first pipe 12a as the first inner pipe 12 moves, making the first pipe 12a communicate with the second pipe 20a, achieving the blowout prevention effect, avoiding the oil and gas of the second docking pipe 20 from flowing back to the first inner pipe 12, and improving the safety of the downhole safety valve 100.
[0044] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If this specific posture changes, the directional indication will also change accordingly.
[0045] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element present at the same time. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or can also be indirectly connected to the other element through an intermediate element.
[0046] In addition, in the present invention, the descriptions involving "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0047] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. An underground safety valve, characterized in that, For docking oil pipes, the downhole safety valve includes: A first docking pipe, including a first outer pipe and a first inner pipe; the first outer pipe and the first inner pipe are in communication; the first outer pipe is used for docking the oil pipe; the first inner pipe is movably sleeved inside the first outer pipe and moves downward under external injection pressure; a blowout preventer is provided inside the first outer pipe, and the blowout preventer is swingably connected to the first outer pipe and can open or cover a first pipe of the first inner pipe; A second docking pipe, docking with the first docking pipe, and the second docking pipe is provided with a second pipe; At this time, the blowout preventer covers the first pipe in the natural state, so that the first pipe and the second pipe are independent of each other, and blocks the oil and gas gushing out through the second pipe; the blowout preventer opens the first pipe as the first inner pipe moves, so that the first pipe communicates with the second pipe.
2. The underground safety valve according to claim 1, characterized in that, The first inner pipe is inside the first outer pipe; The blowout preventer is hinged to the end of the first outer pipe and elastically swings relative to the end of the first outer pipe; the blowout preventer rebounds under the elastic force, one surface of the blowout preventer covers the first pipe, and the other surface of the blowout preventer blocks the oil and gas gushing out through the second pipe.
3. The underground safety valve according to claim 2, characterized in that, The blowout preventer is hinged to the end of the first outer pipe through a rotating shaft; A torsion spring is sleeved on the rotating shaft, one end of the torsion spring elastically abuts against the end of the first outer pipe, the other end of the torsion spring elastically abuts against the blowout preventer, and applies a rebounding force to the blowout preventer; The impact force of the oil and gas input through the first inner pipe is less than the rebounding force applied by the torsion spring to the blowout preventer, so that one surface of the blowout preventer covers the first pipe.
4. The underground safety valve according to claim 2, characterized in that, A first spherical surface is provided at the end of the first outer pipe, The blowout preventer is provided with a second spherical surface, and the second spherical surface is docked with the first spherical surface when the blowout preventer covers the first inner pipe; both the second spherical surface and the first spherical surface are arranged in a ring shape.
5. The underground safety valve according to claim 4, characterized in that, A first pipe body and a first mounting seat are provided at the end of the first outer pipe; The first mounting seat is mounted on the first pipe body, and the blowout preventer is hinged to the first mounting seat and is inside the first mounting seat; A non-metallic sealing ring is provided between the first pipe body and the first mounting seat, and the non-metallic sealing ring is provided with a first step portion and a second step portion, and the first step portion and the second step portion are connected; The first step portion is inserted into the first pipe body, and the second step portion can be inserted into the first mounting seat.
6. The underground safety valve according to claim 5, characterized in that, A third spherical surface is provided on the inner side wall of the non-metallic sealing ring, and the third spherical surface faces the second spherical surface and can be hermetically squeezed by the first spherical surface; When the blowout preventer covers the first inner pipe, the second spherical surface contacts both the first spherical surface and the third spherical surface at the same time.
7. The underground safety valve according to claim 5, characterized in that, The first pipe body allows the first inner pipe to pass through; A sand passing groove is provided on the inner side wall of the first pipe body, and the sand passing groove is arranged along the length direction of the first pipe body and is recessed inward; the sand passing groove is used for accommodating sand, and the bottom of the inner side wall of the sand passing groove is arranged in an arc shape; When the first inner pipe moves relative to the first pipe body, a receiving space is formed between the outer side wall of the first inner pipe and the inner side wall of the sand passing groove, and the sand is located in the receiving space to prevent the first inner pipe from engaging with the first pipe body.
8. The underground safety valve according to any one of claims 1 to 7, characterized in that, A pressure injection port and a first moving pipe are provided in the first outer pipe. The first moving pipe is located on one side of the pressure injection port, and the pressure injection port is connected to an external pressure injection component. The first moving pipe can move within the first outer pipe. One end of the first moving pipe away from the pressure injection port is connected to the first inner pipe. When the external pressure injection component injects pressure into the pressure injection port, the first moving pipe moves relative to the first outer pipe under the action of the injection pressure and applies a moving force to the first inner pipe, causing the first inner pipe to gradually approach the blowout preventer until the first inner pipe opens the blowout preventer.
9. The underground safety valve according to claim 1, characterized in that, A second moving pipe and a spring are provided between the first inner pipe and the first outer pipe. The second moving pipe movably penetrates the first outer pipe and contacts the first inner pipe. The spring is located between the second moving pipe and the first outer pipe and can apply a resilient force to the second moving pipe. When the external pressure injection component relieves the pressure of the pressure injection port, the spring applies a resilient force to the second moving pipe. Under the action of this resilient force, the second moving pipe drives the first inner pipe to move and gradually move away from the blowout preventer, and the blowout preventer gradually covers the first inner pipe.
10. The underground safety valve according to claim 9, characterized in that, The blowout preventer is arranged as a sealing cover.