Safety valve capable of breaking impurity accumulation

Abstract

The utility model discloses a safety valve capable of breaking impurity accumulation, which comprises an upper joint, a middle joint and a lower joint which are connected in sequence, a valve plate seat and a valve plate rotatably mounted on the valve plate seat are mounted in the lower joint, and a return spring used for pulling the valve plate to reset is further arranged on the valve plate seat; a flow pipe is arranged in the middle connector in a sliding mode, one end of the flow pipe stretches into the valve plate base in a sliding mode, the other end of the flow pipe stretches into the upper connector, the flow pipe is sleeved with a power spring, and the power spring is used for driving the flow pipe to move towards one side of the upper connector. The end part, extending into the upper joint, of the flow pipe is provided with a local sawtooth blade along the circumferential direction; a power piston used for pushing the flow pipe to move towards one side of the valve plate seat is further arranged in the upper connector. The current situation that in the prior art, a valve plate cannot be normally closed due to the fact that a flow pipe is possibly blocked by impurities during resetting movement is solved.

Description

Technical Field

[0001] This utility model relates to the field of downhole safety valve technology, and in particular to a safety valve that can break up the accumulation of impurities. Background Technology

[0002] A downhole safety valve is a safety device controlled by a control line extending from the downhole valve to the surface wellhead. It allows for the opening or closing of the tubing and is an indispensable tool in well completion, testing, and other downhole operations. The purpose of installing a surface-controlled downhole safety valve is to shut off fluid flow in the well in the event of a catastrophic event at the wellhead, such as wellhead overpressure or fire, when surface wellhead controls fail. In the event of such an emergency, the surface-controlled downhole safety valve can stop fluid flow in the well, protecting the last line of defense on the surface, including the wellhead. It is a safety device that prevents downhole hazards from spilling onto the surface.

[0003] When the hydraulic pump pressurizes the hydraulic chamber to the opening pressure of the safety valve via the control line interface, the piston designed on the safety valve pushes the internal flow tube and overcomes the spring force of the power spring to open the valve plate. When this pressure is maintained, the safety valve is in the normally open state. When the pressure in the control line is lost, the flow tube is pushed back by the power return spring inside the safety valve, and the valve plate returns to the closed state under the action of the valve plate return spring, thus closing the safety valve.

[0004] Because of impurities flowing in the oil pipe, the flow tube may be obstructed by the impurities during reset and movement, preventing it from completely disengaging from the valve plate. This could cause the valve plate to fail to close properly, leading to the risk of continuous fluid flow in the oil pipe. Utility Model Content

[0005] The purpose of this invention is to provide a safety valve that can break up the accumulation of impurities, and to solve the problem in the prior art that the valve plate may not be able to close properly due to the obstruction of impurities when the flow tube is reset and moved.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A safety valve capable of breaking up impurity buildup includes an upper connector, an intermediate connector, and a lower connector connected in sequence. A valve plate seat and a valve plate rotatably mounted on the valve plate seat are installed inside the lower connector. The valve plate seat is also provided with a return spring for pulling the valve plate back to its original position.

[0008] A flow tube is slidably provided inside the intermediate joint. One end of the flow tube extends into the valve plate seat, and the other end extends into the upper joint. A power spring is sleeved on the flow tube, which is used to drive the flow tube to move toward the upper joint. The end of the flow tube that extends into the upper joint is provided with a circumferentially serrated edge. A power piston is also provided inside the upper joint to push the flow tube to move toward the valve plate seat.

[0009] Preferably, a limiting boss is threaded onto the flow tube, a limiting ring groove is formed on the limiting boss, and a push block is installed on the piston rod of the power piston, the push block being engaged in the limiting ring groove.

[0010] Preferably, the upper connector has an installation hole on its pipe wall, the power piston is threadedly installed in the installation hole, the liquid inlet end of the power piston is provided with a sealing component that seals with the installation hole, and the upper connector has an injection interface that communicates with the installation hole and is used to connect to the control pipeline.

[0011] Preferably, the intermediate joint has a stepped hole, the flow tube slides into the stepped hole, one end of the power spring abuts against the limiting boss, and the other end abuts against the stepped hole.

[0012] Preferably, the distance between the inner end of the lower connector and the valve plate seat is greater than the length of the valve plate.

[0013] Preferably, the upper connector has an internal threaded hole at one end, and the lower connector has a threaded head at one end.

[0014] Preferably, the flow tube includes a tube body, on which a first stage and a second stage are provided. The serrated blade is located at the end of the first stage, and the first stage is provided with a threaded portion for mounting the limiting boss.

[0015] Preferably, both the first stage and the second stage have multiple through holes along the circumferential direction.

[0016] Beneficial effects:

[0017] When the safety valve needs to be opened to allow internal liquid flow, the control piston pushes the flow tube toward the valve seat and overcomes the elastic force of the power spring and return spring, pushing the valve plate to rotate relative to the valve seat and remain open. When the safety valve needs to be closed, the driving force of the power piston is released. During the process of the power spring pushing the flow tube to reset, impurities in the fluid are broken up by the serrated edge, which facilitates the smooth reset of the flow tube. After the flow tube is reset, the return spring pulls the valve plate to reset and cooperates with the valve seat to close the safety valve. Attached Figure Description

[0018] Figure 1 This is a first-view structural diagram of an embodiment of the present utility model;

[0019] Figure 2 This is a second-view structural schematic diagram of an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the flow tube structure in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of the limiting boss in an embodiment of the present utility model;

[0022] exist Figures 1 to 4 In the diagram, the correspondence between component names or lines and the drawing numbers is as follows:

[0023] Upper connector 1, mounting hole 101, internal threaded hole 102, intermediate connector 2, stepped hole 201, lower connector 3, connecting threaded head 301, valve plate seat 4, valve plate 5, return spring 6, flow tube 7, serrated blade 71, first stage 72, second stage 73, threaded part 74, through hole 75, power spring 8, power piston 9, limiting boss 10, limiting ring groove 11, push block 12, sealing assembly 13, injection interface 14. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] See Figures 1-4 As shown in the embodiment of this utility model, a safety valve capable of breaking up impurity buildup is proposed, comprising an upper connector 1, an intermediate connector 2, and a lower connector 3 connected in sequence. A valve plate seat 4 and a valve plate 5 rotatably mounted on the valve plate seat 4 are installed in the lower connector 3. A return spring 6 is also provided on the valve plate seat 4 for pulling the valve plate 5 back to its original position. In the normally closed state, the return spring 6 pulls the valve plate 5 to engage with the valve plate seat 4. Simultaneously, a flow tube 7 is slidably provided in the intermediate connector 2. One end of the flow tube 7 slides into the valve plate seat 4, and the other end extends into the upper connector 1. A power spring 8 is sleeved on the flow tube 7, which drives the flow tube 7 to move towards the upper connector 1. A circumferentially serrated edge 71 is provided at the end of the flow tube 7 extending into the upper connector 1. When closed, the flow tube 7 returns to its original position, and the serrated edge 71 breaks up the impurities, allowing the power spring 8 to smoothly push the flow tube 7 back to its original position. Meanwhile, the upper connector 1 is also equipped with a power piston 9 for pushing the flow pipe 7 toward the valve plate seat 4.

[0026] Specifically, when the safety valve needs to be opened, the power piston 9 pushes the flow tube 7 toward the valve plate seat 4 to open the valve plate 5, thus achieving the open state. When the safety valve is closed, the thrust of the power piston 9 is released, and the flow tube 7 is pushed back to its original position under the action of the power spring 8. During the resetting movement, the impurities are broken by the serrated blade 71 and the valve plate is successfully reset. At the same time, the return spring 6 pulls the valve plate 5 to cooperate with the valve plate seat 4 to achieve the closed state.

[0027] Specifically, a limiting boss 10 is threaded onto the flow tube 7, and a limiting annular groove 11 is formed on the limiting boss 10. A push block 12 is installed on the piston rod of the power piston 9, and the push block 12 engages in the limiting annular groove 11. The cooperation between the push block 12 and the limiting annular groove 11 ensures that the piston rod of the power piston 9 can move synchronously with the flow tube 7. When the power piston 9 pressurizes, it pushes the flow tube 7 to move, and when the power piston 9 releases pressure, the flow tube 7 returns to its original position and pushes the piston rod back to its original position. The limiting boss 10 can also limit the movement stroke of the flow tube 7.

[0028] Furthermore, the flow tube 7 includes a tube body, on which a first stage 72 and a second stage 73 are provided. The serrated blade 71 is provided at the end of the first stage 72. The first stage 72 is provided with a threaded portion 74 for installing the limiting boss 10. The flow tube 7 has a stepped structure as a whole, which facilitates installation and satisfies sliding fit.

[0029] Meanwhile, multiple through holes 75 are provided circumferentially on both the first stage 72 and the second stage 73. The through holes 75 are used to release pressure in the annular cavity formed by the flow tube 7, the upper connector 1, and the intermediate connector 2, so as to ensure the stable movement of the flow tube 7.

[0030] To install the power piston 9 and enable hydraulic control of the power piston 9 via an external control pipeline, a mounting hole 101 is specifically provided on the pipe wall of the upper connector 1. The power piston 9 is threaded into the mounting hole 101. The inlet end of the power piston 9 is provided with a sealing component 13 that seals with the mounting hole 101. An injection interface 14 is provided on the upper connector 1, which communicates with the mounting hole 101 and is used to connect the control pipeline, ensuring a good seal at the inlet end of the power piston 9. The control pipeline is connected through the injection interface 14, thereby ensuring hydraulic control of the piston rod extension and retraction of the power piston 9. The control pipeline generally extends to the well surface for remote control.

[0031] Specifically, a stepped hole 201 is provided on the intermediate joint 2, the flow tube 7 slides into the stepped hole 201, one end of the power spring 8 abuts against the limiting boss 10, and the other end abuts against the stepped hole 201. The stepped hole 201 limits the power spring 8 to ensure stability under elastic force.

[0032] Meanwhile, the distance between the inner end of the lower connector 3 and the valve plate seat 4 is greater than the length of the valve plate 5, ensuring that the valve plate 5 can be completely flipped to avoid affecting the internal liquid flow.

[0033] To facilitate the installation of the entire safety valve into the oil pipe, an internal threaded hole 102 is provided at the end of the upper connector 1, and a threaded head 301 is provided at the end of the lower connector 3.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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 utility model according to the specific circumstances.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, 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 this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A safety valve capable of breaking up impurity buildup, characterized in that: It includes an upper connector (1), an intermediate connector (2) and a lower connector (3) connected in sequence. The lower connector (3) is equipped with a valve plate seat (4) and a valve plate (5) rotatably mounted on the valve plate seat (4). The valve plate seat (4) is also provided with a return spring (6) for pulling the valve plate (5) to reset. The intermediate connector (2) is provided with a flow tube (7) that slides inside. One end of the flow tube (7) slides into the valve plate seat (4) and the other end extends into the upper connector (1). A power spring (8) is sleeved on the flow tube (7) and the power spring (8) is used to drive the flow tube (7) to move toward the upper connector (1). The end of the flow tube (7) that extends into the upper connector (1) is provided with a serrated edge (71) in a circumferential direction. The upper connector (1) is also provided with a power piston (9) for pushing the flow tube (7) toward the valve plate seat (4).

2. The safety valve for breaking up impurity buildup according to claim 1, characterized in that: The flow tube (7) is threaded with a limiting boss (10), and a limiting ring groove (11) is formed on the limiting boss (10). A push block (12) is installed on the piston rod of the power piston (9), and the push block (12) is engaged in the limiting ring groove (11).

3. A safety valve capable of breaking up impurity buildup according to claim 2, characterized in that: The upper connector (1) has an installation hole (101) on its pipe wall. The power piston (9) is threaded into the installation hole (101). The liquid inlet end of the power piston (9) is provided with a sealing assembly (13) that seals the installation hole (101). The upper connector (1) has an injection interface (14) that communicates with the installation hole (101) and is used to connect the control pipeline.

4. A safety valve capable of breaking up impurity buildup according to claim 3, characterized in that: The intermediate connector (2) has a stepped hole (201) and the flow tube (7) slides into the stepped hole (201). One end of the power spring (8) abuts against the limiting boss (10) and the other end abuts against the stepped hole (201).

5. A safety valve capable of breaking up impurity buildup according to claim 4, characterized in that: The distance between the inner end of the lower connector (3) and the valve plate seat (4) is greater than the length of the valve plate (5).

6. A safety valve capable of breaking up impurity buildup according to any one of claims 2-5, characterized in that: The upper connector (1) has an internal threaded hole (102) at its end, and the lower connector (3) has a threaded head (301) at its end.

7. A safety valve capable of breaking up impurity buildup according to claim 6, characterized in that: The flow tube (7) includes a tube body, on which a first stage (72) and a second stage (73) are provided. The serrated blade (71) is located at the end of the first stage (72), and the first stage (72) is provided with a threaded portion (74) for installing the limiting boss (10).

8. A safety valve capable of breaking up impurity buildup according to claim 7, characterized in that: Both the first stage (72) and the second stage (73) have multiple through holes (75) in the circumferential direction.

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