Wellhead device with protective structure
By designing the vertical and horizontal cavity structures of the wellhead device, and combining pistons, lead screws, and compression springs, automatic pressure relief and manual fluid drainage of the downhole were achieved, solving the problems of environmentally unfriendly and unsafe wellhead sealing, and improving the safety and environmental friendliness of the wellhead.
Patent Information
- Application Number
- CN202520784322.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-04-24
AI Technical Summary
Existing wellhead plugging devices are inadequate in terms of sealing reliability and environmental friendliness, and their safety performance cannot be guaranteed. In particular, they cannot effectively relieve pressure when the pressure inside the well increases, leading to wellhead pollution and safety hazards.
A wellhead device was designed, comprising vertical and horizontal cavities, with a piston connected to a lead screw. Automatic and manual pressure relief functions are achieved through a compression spring and a pressure relief hole. It is equipped with a pressure sensor to monitor downhole pressure and has the ability to automatically relieve pressure and manually drain fluid.
It enables automatic pressure relief when downhole pressure rises, avoiding wellhead contamination, improving safety and environmental protection, and also has the function of flexibly adjusting the pressure relief.
Smart Images
Figure CN223867969U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil wellhead technology, and in particular to a wellhead device with a protective structure. Background Technology
[0002] Currently, both domestic and international oil and gas fields have a large number of low-yield, temporarily non-producing oil and gas wells that require temporary sealing. These wells also need to have their internal pressure monitored and released at any time. Considering that domestic oil fields typically inject water into the producing formations, the pressure inside abandoned wells gradually increases as formation pressure rises. This necessitates that the sealing device withstand a certain pressure while also considering subsequent production. Therefore, in addition to reliable sealing, a pressure release function is also required. Current wellhead sealing methods involve connecting valves and pressure gauges to the wellhead, which are opened for pressure release or venting when needed. However, this results in liquid flowing out of the wellhead and causing pollution, which is environmentally unfriendly. Furthermore, there are no other protective devices at the wellhead, and the pressure needs to be monitored constantly, compromising safety. Utility Model Content
[0003] To address the current issues of environmental unfriendliness and inadequate safety during oil production plugging, this invention provides a wellhead device with a protective structure.
[0004] The technical solution provided by this utility model is: a wellhead device with a protective structure, including a wellhead, which is connected to a housing by a clamp and an octagonal sealing gasket. The housing has a vertical cavity and a horizontal cavity, both of which are connected to the wellhead. A piston is installed in the horizontal cavity, located on the right side of the horizontal cavity. A lead screw is threadedly connected to the left side of the horizontal cavity. A compression spring is installed between the lead screw and the piston. A countersunk hole is opened on the right end face of the piston. An annular groove is opened on the outer circle of the piston. A side hole is opened between the annular groove and the countersunk hole. The piston is connected to the horizontal cavity on both sides of the annular groove through a sealing ring with clearance fit. A pressure relief hole is opened on the left side of the annular groove of the piston in the horizontal cavity. A pressure relief chamber is provided at the pressure relief hole location in the housing. A drain valve is provided at the bottom of the pressure relief chamber, and an exhaust hole is provided at the top of the pressure relief chamber.
[0005] The horizontal cavity has a drain pipe on the left side of the pressure relief hole, which is connected to the horizontal cavity. The right side of the lead screw has a positioning pin B, and the left side of the piston has a positioning pin A. Compression springs are respectively sleeved on positioning pins A and B, and the compression springs are welded to positioning pins A and B.
[0006] A torque head is provided at the left end of the lead screw, and an irregular torque hole is opened on the end face of the torque head.
[0007] A pressure sensor is installed on the horizontal cavity.
[0008] The beneficial effects of this utility model are as follows: when the downhole pressure rises to the set value, the pressure pushes the piston to move to the left. When the piston's ring groove moves to the pressure relief hole position, the downhole pressurized fluid flows into the pressure relief chamber, thereby achieving the purpose of automatic pressure relief. Rotating the lead screw and adjusting the compression degree of the compression spring can also change the pressure value of the pressure relief. At the same time, it also has the function of manual pressure relief and fluid drainage. Attached Figure Description
[0009] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;
[0010] Appendix Figure 2 This is a schematic diagram of the piston structure in this utility model.
[0011] In the diagram, 1-wellhead, 2-shell, 3-clamp, 4-octagonal sealing gasket, 5-vertical cavity, 6-horizontal cavity, 7-pressure relief cavity, 8-piston, 501-counterhead, 802-side hole, 803-annular groove, 804-positioning pin A, 9-lead screw, 901-positioning pin B, 902-torque head, 10-pressure relief hole, 11-vent hole, 12-drain valve, 13-drain pipe, 14-compression spring, 15-pressure sensor. Detailed Implementation
[0012] like Figures 1-2 As shown, a wellhead device with a protective structure includes a wellhead 1. The wellhead 1 is connected to a housing 2 via a clamp 3 and an octagonal sealing gasket 4. The housing 2 has a vertical cavity 5 and a horizontal cavity 6, both of which are connected to the wellhead 1. A piston 8 is installed in the horizontal cavity 6, located on the right side of the horizontal cavity 6. A screw 9 is threadedly connected to the left side of the horizontal cavity 6. A compression spring 14 is installed between the screw 9 and the piston 8. A countersunk hole 801 is opened on the right end face of the piston 8. An annular groove 803 is opened on the outer circle of the piston 8. A side hole 802 is opened between the annular groove 803 and the countersunk hole 801. The piston 8 is connected to the horizontal cavity 6 on both sides of the annular groove 803 via a sealing ring with clearance fit. A pressure relief hole 10 is opened on the left side of the annular groove 803 of the piston 8 in the horizontal cavity 6. A pressure relief chamber 7 is provided at the pressure relief hole 10 in the housing 2. A drain valve 12 is provided at the bottom of the pressure relief chamber 7, and an exhaust hole 11 is provided at the top of the pressure relief chamber 7.
[0013] When the downhole pressure rises to the set value, the pressure pushes the piston 8 to move to the left. When the annular groove 803 of the piston 8 moves to the pressure relief hole 10, the pressurized fluid in the well flows into the pressure relief chamber 7, thereby achieving the purpose of automatic pressure relief. Rotating the lead screw 9 and adjusting the compression degree of the compression spring 14 can also change the pressure value of the pressure relief.
[0014] A drain pipe 13 is provided on the left side of the pressure relief hole 10 in the horizontal cavity 6. The drain pipe 13 is connected to the horizontal cavity 6. A positioning post B901 is provided on the right side of the lead screw 9, and a positioning post A804 is provided on the left side of the piston 8. The compression spring 14 is respectively sleeved on the positioning post A804 and the positioning post B901. The compression spring 14 is welded to the positioning post A804 and the positioning post B901. When manual pressure relief and drainage are required, rotate the lead screw 9 to move to the left. The lead screw 9 drives the compression spring 14 and the piston 8 to move to the left until the annular groove 803 is connected to the drain hole 13, and then manual pressure relief and drainage can be achieved.
[0015] The left end of the lead screw 9 is provided with a torque head 902. The end face of the torque head 902 has irregular torque holes, which serve as an anti-theft measure. The horizontal cavity 6 makes the lead screw 9 horizontally arranged to prevent rainwater from entering and causing rust.
[0016] A pressure sensor 15 is installed on the horizontal cavity 6 to monitor downhole pressure changes.
Claims
1. A wellhead device with a protective structure, comprising a wellhead (1), characterized in that: The wellhead (1) is connected to the housing (2) via clamps (3) and octagonal sealing gaskets (4). The housing (2) has a vertical cavity (5) and a horizontal cavity (6). Both the vertical cavity (5) and the horizontal cavity (6) are connected to the wellhead (1). A piston (8) is installed in the horizontal cavity (6). The piston (8) is located on the right side of the horizontal cavity (6). A screw (9) is threaded to the left side of the horizontal cavity (6). A compression spring (14) is installed between the screw (9) and the piston (8). A countersunk hole (801) is opened on the right end face of the piston (8). The outer circle of the plug (8) has an annular groove (803), and a side hole (802) is opened between the annular groove (803) and the countersunk hole (801). The piston (8) is connected to the horizontal cavity (6) on both sides of the annular groove (803) through a sealing ring with clearance fit. The horizontal cavity (6) has a pressure relief hole (10) on the left side of the annular groove (803) of the piston (8). The housing (2) has a pressure relief cavity (7) at the pressure relief hole (10). The bottom of the pressure relief cavity (7) is provided with a drain valve (12), and the upper part of the pressure relief cavity (7) is provided with an exhaust hole (11).
2. A wellhead device with a protective structure according to claim 1, characterized in that: A drain pipe (13) is provided on the left side of the pressure relief hole (10) in the horizontal cavity (6). The drain pipe (13) is connected to the horizontal cavity (6). A positioning post B (901) is provided on the right side of the lead screw (9). A positioning post A (804) is provided on the left side of the piston (8). A compression spring (14) is respectively sleeved on the positioning post A (804) and the positioning post B (901). The compression spring (14) is welded together with the positioning post A (804) and the positioning post B (901).
3. A wellhead device with a protective structure according to claim 1, characterized in that: The left end of the lead screw (9) is provided with a torque head (902), and the end face of the torque head (902) has an irregular torque hole.
4. A wellhead device with a protective structure according to claim 1, characterized in that: A pressure sensor (15) is installed on the horizontal cavity (6).