Valve seat structure for subsurface safety valve

Abstract

The utility model relates to the technical field of valve seats, and provides a valve seat structure for a subsurface safety valve, which comprises a valve seat main body and a valve plate chamber for mounting a sealing valve plate, and further comprises a connecting sleeve, the valve plate chamber is sleeved on the valve seat main body, threads with opposite screwing directions are arranged at two ends of the inner wall of the connecting sleeve, and the thread at one end is connected with the valve seat main body. Threads at the other end of the valve seat body are connected with the valve plate chamber, and a limiting structure for limiting relative rotation is arranged between the valve seat body and the valve plate chamber. The axial relative position of the valve seat body and the valve plate chamber can be effectively limited, and sealing failure caused by a gap generated between the valve seat body and the sealing valve plate is avoided.

Description

Technical Field

[0001] This utility model relates to the field of valve seat technology, and more specifically, to a valve seat structure for a downhole safety valve. Background Technology

[0002] A downhole safety valve is a downhole tool installed inside the wellbore and connected to the tubing to prevent blowouts and ensure production safety. The valve seat structure is a crucial component of the downhole safety valve, used to mount the sealing valve plate. The valve seat structure typically includes a valve seat body and a valve plate chamber. When the valve is closed, the sealing valve plate is hinged to the valve plate and, under the action of a torsion spring, contacts the valve seat body to form a sealing pair.

[0003] In the prior art (e.g., patent document with publication number "CN219176305U"), the valve plate chamber and the valve seat body are usually connected by threads. However, during use, due to factors such as impact and vibration, the threads are easily loosened, which causes the valve seat body and the valve plate chamber to move axially relative to each other, resulting in a gap between the valve seat body and the valve plate, making it impossible to seal properly. Utility Model Content

[0004] The purpose of this invention is to provide a valve seat structure for downhole safety valves to solve the above-mentioned defects of the prior art.

[0005] This utility model is achieved through the following technical solution:

[0006] A valve seat structure for a downhole safety valve includes a valve seat body and a valve plate chamber for installing a sealing valve plate, and a connecting sleeve. The valve plate chamber is sleeved on the valve seat body. The inner wall of the connecting sleeve has threads with opposite directions at both ends. The thread at one end is connected to the valve seat body, and the thread at the other end is connected to the valve plate chamber. A limiting structure is provided between the valve seat body and the valve plate chamber to restrict relative rotation.

[0007] Optionally, the limiting structure includes a limiting groove on the valve seat body and a limiting block on the valve plate chamber, wherein the limiting block cooperates with the limiting groove.

[0008] Optionally, the limiting structure is a connecting key.

[0009] Optionally, the sidewall of the connecting sleeve is provided with through holes at intervals along the circumferential direction, and the through holes are provided with internal hexagon screws.

[0010] Optionally, the through holes are arranged in a ring array.

[0011] Optionally, the valve seat body is provided with an installation step, and the valve plate chamber is fitted onto the installation step.

[0012] Optionally, the nominal diameter of the threads at both ends of the connecting sleeve is equal.

[0013] Optionally, the sealing surface of the valve seat body is provided with an annular sealing groove, and an O-ring is provided in the annular sealing groove.

[0014] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0015] 1. In this utility model, the connecting sleeve has threads with opposite directions at both ends. The thread at one end is connected to the valve seat body, and the thread at the other end is connected to the valve plate chamber. That is, a forward and reverse thread connection is adopted. Moreover, the relative rotation between the valve seat body and the valve plate chamber is restricted by the limiting structure. In this way, after the connecting sleeve, valve seat body and valve plate chamber are installed in place, the axial relative position of the valve seat body and the valve plate chamber can be effectively restricted, avoiding the formation of gaps between the valve seat body and the sealing valve plate, which would lead to sealing failure.

[0016] 2. In this utility model, the sealing valve plate and the valve seat body will form a sealing pair when they come into contact. At the same time, an O-ring is provided on the sealing surface between the sealing valve plate and the valve seat body. When the O-ring is squeezed, it will form another sealing pair, thus constituting a double seal and improving the sealing effect. Attached Figure Description

[0017] Figure 1 A schematic diagram of a valve seat structure for a downhole safety valve provided by this utility model;

[0018] Figure 2 This is a schematic diagram of the exploded structure of the valve seat body and the valve plate chamber;

[0019] Figure 3 This is a schematic diagram of the connecting sleeve.

[0020] Reference numerals: 1-valve seat body, 101-limiting groove, 2-valve plate chamber, 201-limiting block, 3-connecting sleeve, 301-through hole, 4-sealing valve plate, 5-internal hex screw. Detailed Implementation

[0021] refer to Figure 1 A valve seat structure for a downhole safety valve includes a connecting sleeve 3, a valve seat body 1, and a valve plate chamber 2 for installing a sealing valve plate 4. It should be noted that the installation method of the sealing valve plate 4 and other aspects not detailed here are not the focus of this utility model. They can be implemented by those skilled in the art based on existing technology and common knowledge in the field, and will not be elaborated here.

[0022] The valve plate chamber 2 is fitted onto the valve seat body 1. Alternatively, the lower end of the valve seat body 1 is provided with a step, and the valve plate chamber 2 is fitted onto the step at the lower end of the valve seat body 1. After installation, the upper end of the valve plate chamber 2 abuts against the shoulder of the step at the lower end of the valve plate chamber 2, and the sealing valve plate 4 abuts against the valve seat to form a sealing pair.

[0023] The connecting sleeve 3 has threads with opposite directions at both ends. The thread at one end is connected to the valve seat body 1, and the thread at the other end is connected to the valve plate chamber 2. Alternatively, the nominal diameters of the threads at both ends of the connecting sleeve 3 are equal, that is, the nominal diameters of the external threads on the valve seat body 1 and the valve plate chamber 2 should also be equal.

[0024] Based on the above, a limiting structure is provided between the valve seat body 1 and the valve plate chamber 2 to restrict relative rotation. That is, in this invention, the connecting sleeve 3 is connected to the valve plate chamber 2 and the valve seat body 1 by a positive and negative snapping method, and the relative rotation between the valve seat body 1 and the valve plate chamber 2 is restricted. In this way, after the connecting sleeve 3, the valve seat body 1 and the valve plate chamber 2 are installed in place, the axial relative position of the valve seat body 1 and the valve plate chamber 2 can be effectively restricted, avoiding the formation of gaps between the valve seat body 1 and the sealing valve plate 4, which would lead to sealing failure.

[0025] refer to Figure 2 As an alternative, the limiting structure in this embodiment includes a limiting groove 101 on the valve seat body 1 and a limiting block 201 on the valve plate chamber 2, the limiting block 201 engaging with the limiting groove 101. During installation, the circumferential rotation of the valve seat body 1 and the valve plate chamber 2 is restricted, and the limiting block 201 is aligned with the limiting groove 101. Tightening the connecting sleeve 3 will bring the valve seat body 1 and the valve plate chamber 2 closer to each other until the limiting block 201 engages with the limiting groove 101, i.e., the connection is complete.

[0026] In other embodiments, other structures can be used to restrict the relative rotation between the valve seat body 1 and the valve plate chamber 2. For example, the limiting structure is a connecting key. In practical applications, corresponding keyways are provided in both the valve seat body 1 and the valve plate chamber 2.

[0027] refer to Figure 1 and Figure 3 Alternatively, the sidewall of the connecting sleeve 3 is provided with through holes 301 spaced apart along the circumferential direction, and an internal hexagon screw 5 is provided in the through hole 301. This arrangement facilitates the rotation of the connecting sleeve 3 using tools such as a socket wrench. Furthermore, the through holes 301 can be arranged in a circular array, which facilitates the use of the internal hexagon screw 5 in the next through hole 301 after each rotation of a certain angle.

[0028] In this embodiment, the sealing surface of the valve seat body 1 is provided with an annular sealing groove, and an O-ring is provided in the annular sealing groove. In this way, the sealing valve plate 4 and the valve seat body 1 will form a sealing pair when they come into contact. At the same time, when the O-ring is squeezed, another sealing pair will be formed, thus constituting a double seal and improving the sealing effect.

[0029] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A valve seat structure for a downhole safety valve, comprising a valve seat body and a valve plate chamber for mounting a sealing valve plate, characterized in that, It also includes a connecting sleeve, with the valve plate chamber fitted onto the valve seat body. The inner wall of the connecting sleeve has threads with opposite directions at both ends. One thread is connected to the valve seat body, and the other thread is connected to the valve plate chamber. A limiting structure is provided between the valve seat body and the valve plate chamber to restrict relative rotation. The limiting structure includes a limiting groove on the valve seat body and a limiting block on the valve plate chamber. The limiting block cooperates with the limiting groove.

2. The valve seat structure for a downhole safety valve according to claim 1, characterized in that, The limiting structure is a connecting key.

3. The valve seat structure for a downhole safety valve according to claim 1 or 2, characterized in that, The sidewall of the connecting sleeve is provided with through holes at intervals along the circumferential direction, and the through holes are provided with internal hexagon screws.

4. The valve seat structure for a downhole safety valve according to claim 3, characterized in that, The through holes are arranged in a ring array.

5. The valve seat structure for a downhole safety valve according to claim 1 or 2, characterized in that, The valve seat body is provided with an installation step, and the valve plate chamber is fitted onto the installation step.

6. The valve seat structure for a downhole safety valve according to claim 1 or 2, characterized in that, The nominal diameters of the threads at both ends of the connecting sleeve are equal.

7. The valve seat structure for a downhole safety valve according to claim 1 or 2, characterized in that, The sealing surface of the valve seat body is provided with an annular sealing groove, and an O-ring is provided in the annular sealing groove.

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