Anti-corrosion automatic exhaust valve for wellhead of oil field

Abstract

The utility model relates to the field of oil field valves, and discloses an anti-corrosion automatic exhaust valve for an oil field wellhead, which is characterized in that two ends of a valve body are connected with a pipeline through threads, namely external threads at one end and internal threads at the other end, and external threads at two ends or internal threads at two ends; a pressing cap is mounted on the outer side of the valve seat; the spring seat comprises a cylinder and an annular protrusion at the bottom end of the cylinder, vertical circular exhaust through holes are evenly formed in the circumferential direction of the cylinder, vertical arc-shaped exhaust through holes are formed in the circumferential direction of the cylinder from the middle to the inside at intervals of the circular exhaust through holes, and holes are formed in the positions corresponding to the annular protrusion in an inward extending mode along an arc. According to the utility model, various thread combinations are arranged at the end part, so that the connector is suitable for various pipeline ports; the pressing cap is additionally arranged, so that the firmness is greatly enhanced; the vent holes are formed, so that suffocation is fundamentally avoided, and safe production is guaranteed; a pressure gauge mounting port is formed, so that the pressure condition is mastered at any time; the device is suitable for media such as oil, water and gas; the material selection is precise and appropriate, and corrosion resistance and other excellent performance are achieved.

Description

Technical Field

[0001] The utility model relates to the field of oil field valves, in particular to an oil field wellhead anti-corrosion automatic exhaust valve. Background Art

[0002] When producing oil, oil fields generally produce a mixture of oil and natural gas. The natural gas is extracted from the casing and transported out through a pipeline at the wellhead. In order to better control the flow of gas in the pipeline, a one-way exhaust valve is usually installed on the pipeline. However, the current one-way exhaust valve has been found to have the following defects during use: First, the connection method between the one-way exhaust valve and the pipeline is relatively simple. In particular, when both ends of the one-way exhaust valve are equipped with female buckles, other connectors are often required as a link to connect it to the pipeline normally; second, the valve seat inside the one-way exhaust valve that is sealed with the sealing ball is only supported by the boss, which is not firm enough; third, when the pressure is too high, the sealing ball squeezes the spring back to close the central cavity of the spring seat, and the airflow is blocked and cannot be transported out, threatening production safety; fourth, the material selection is not precise enough and the corrosion resistance is poor. Utility Model Content

[0003] In order to overcome the defects of the prior art, the utility model provides an oilfield wellhead anti-corrosion automatic exhaust valve, the technical solution of which is as follows:

[0004] An oilfield wellhead anti-corrosion automatic exhaust valve comprises a tubular valve body, both ends of the valve body are connected to the pipeline by threads, a valve seat with a circumferentially embedded sealing ring is installed on one side of the valve body cavity, and a sealing ball, a spring and a spring seat are installed in sequence from the inside to the outside on the other side, the spring seat cooperates with the corresponding internal thread of the valve body by its external thread, and the sealing ball is sealed on the valve seat under the action of the spring; the two ends of the valve body are connected to the pipeline by threads in the following ways: one end has external threads and the other end has internal threads, both ends have external threads or both ends have internal threads; A pressure cap is installed on the outside of the valve seat, and the pressure cap cooperates with the corresponding internal thread of the valve body with its external thread; the spring seat includes a cylinder and a ring convex at its bottom end, and a number of vertical circular exhaust holes are evenly opened around the cylinder, and a number of vertical arc-shaped exhaust holes are opened from the middle to the inside at the intervals of the circular exhaust holes around the cylinder, and the arc-shaped exhaust holes are opened inward along the arc at the corresponding ring convex position; the sealing ring, spring, sealing ball, valve body, valve seat, pressure cap and spring seat are all made of corrosion-resistant materials.

[0005] Furthermore, the number of the circular exhaust holes is set to 3 to 8.

[0006] Furthermore, there are no less than 3 arc-shaped exhaust holes.

[0007] Furthermore, the valve body is provided with a pressure gauge installation port at the front or rear thereof.

[0008] Furthermore, a locking cap is installed on the outer side of the spring seat, and the locking cap cooperates with the corresponding internal thread of the valve body through its external thread.

[0009] Furthermore, the pressing cap is provided with a plurality of blind holes.

[0010] Furthermore, there are no less than 2 blind holes.

[0011] Furthermore, the sealing ring is made of hydrogenated nitrile rubber.

[0012] Furthermore, the spring is made of stainless steel.

[0013] Furthermore, the sealing ball, valve body, valve seat, pressure cap and spring seat are all made of stainless steel.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] 1. The utility model realizes normal connection with various pipeline ports by setting a variety of thread combinations at the end, which is economical and practical, quick to install, and improves work efficiency.

[0016] 2. The utility model greatly enhances the firmness by adding a pressure cap connected to the valve body through threads.

[0017] 3. The utility model provides an exhaust hole on the spring seat, thereby fundamentally avoiding the occurrence of air holding and ensuring safe production.

[0018] 4. The utility model provides a pressure gauge installation port so that the pressure status can be monitored at any time.

[0019] 5. The utility model has a wide range of applications and is applicable to media such as oil, water, and gas.

[0020] 6. The material of this utility model is carefully selected, and it has excellent properties such as corrosion resistance and high temperature resistance.

[0021] 7. The utility model is applicable to the wellhead pipelines of oil and gas wells and pipelines in pipeline transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the utility model with external thread on one end and internal thread on the other end (without pressure gauge installation port);

[0023] Figure 2 This is a schematic diagram of the structure of the utility model with external threads on one end and internal threads on the other end (with a pressure gauge installation port);

[0024] Figure 3 This is a schematic diagram of the structure of the utility model in which both ends are external threads;

[0025] Figure 4 This is a schematic diagram of the structure of the utility model with internal threads at both ends;

[0026] Figure 5 This is a schematic diagram of the top view of the spring seat of the utility model;

[0027] In the figure: 1-valve body, 2-pressure cap, 3-valve seat, 4-sealing ball, 5-spring, 6-spring seat, 7-blind hole, 8-sealing ring, 9-pressure gauge installation port, 10-inner cavity, 11-circular exhaust hole, 12-locking cap, 13-arc-shaped exhaust hole, 14-cylinder, 15-ring convex, 16-pressure gauge. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the embodiments and accompanying drawings. Example 1

[0029] See also Figure 1 and Figure 5 An oilfield wellhead anti-corrosion automatic exhaust valve, comprising a tubular valve body 1, the two ends of the valve body 1 are connected to the pipeline by threads, a valve seat 3 with a circumferentially embedded sealing ring 8 is installed on one side of the inner cavity of the valve body 1, and a sealing ball 4, a spring 5 and a spring seat 6 are installed on the other side in sequence from the inside to the outside, the spring seat 6 has its external thread matched with the corresponding internal thread of the valve body 1, and the sealing ball 4 is sealed on the valve seat 3 under the action of the spring 5; the two ends of the valve body 1 are connected to the pipeline by threads in the following way: one end is externally threaded and the other end is threaded. Internal thread; a pressure cap 2 is mounted on the outside of the valve seat 3, and the pressure cap 2, with its external thread, mates with the corresponding internal thread of the valve body 1; the spring seat 6 includes a cylinder 14 and an annular protrusion 15 at its bottom end. The cylinder 14 has 3 to 8 vertical circular exhaust holes 11 evenly distributed around the circumference. The cylinder 14 also has no fewer than 3 vertical arc-shaped exhaust holes 13 extending inward from the center of the cylinder 14 at intervals between the circular exhaust holes 11. The arc-shaped exhaust holes 13 extend inward along the arc at the corresponding positions of the annular protrusion 15. The arc-shaped exhaust holes 13 at the position of the annular protrusion 15 also facilitate tightening with tools.

[0030] The pressure cap 2 is equipped with at least two blind holes 7, facilitating tightening with tools. The sealing ring 8 is made of hydrogenated nitrile rubber (HNBR), a rubber with exceptional overall performance, boasting not only high strength but also excellent resistance to chemical corrosion, high temperatures, tearing, and abrasion. Stainless steel is used for the spring 5 due to its high strength and corrosion resistance. The sealing ball 4, valve body 1, valve seat 3, pressure cap 2, and spring seat 6 are all made of stainless steel. Example 2

[0031] See also Figure 2 and Figure 5An oilfield wellhead anti-corrosion automatic exhaust valve has a technical solution substantially identical to that of Example 1, differing in that a pressure gauge installation port 9 is provided at the front of the valve body 1 for mounting a pressure gauge 16. Alternatively, the pressure gauge installation port 9 can be located at the rear of the valve body 1, depending on site conditions. Whether the pressure gauge installation port 9 is located at the front or rear of the valve body 1 facilitates installation and allows for timely monitoring of pressure conditions. Example 3

[0032] See also Figure 3 and Figure 5 An oilfield wellhead anti-corrosion automatic exhaust valve, the technical solution of which is basically the same as that of Example 2, except that:

[0033] 1. The two ends of the valve body 1 are connected to the pipeline through threads. Specifically, both ends are external threads. This connection method is suitable for the situation where the pipelines connected at both ends are internal threads.

[0034] Second, a locking cap 12 is installed on the outside of the spring seat 6, and the locking cap 12 cooperates with the corresponding internal thread of the valve body 1 with its external thread. With the locking cap 12 as a support, the spring seat 6 will not retreat when encountering excessive pressure, ensuring that there is no risk of failure. Example 4

[0035] See also Figure 4 and Figure 5 An oilfield wellhead anti-corrosion automatic exhaust valve, whose technical solution is basically the same as that of Example 2, except that the two ends of the valve body 1 are connected to the pipeline by threads: both ends are internal threads, which is suitable for the case where the pipelines connected at both ends are external threads.

[0036] The basic working principle of this utility model is as follows:

[0037] This utility model has superior corrosion resistance and high temperature resistance, is applicable to temperatures between -29°C and 130°C, has a starting pressure of less than 0.15 MPa, and is suitable for media such as oil, water, and gas. The exhaust valve is installed at the appropriate wellhead location according to the correct inlet and outlet directions of the oil well pipeline and design requirements, and the pre-compression of the spring 5 is adjusted according to the required venting pressure of the oil well conditions. When the gas pressure in the well exceeds the set pressure of the exhaust valve, air flows through the central cavity of the pressure cap 2 and the valve seat 3, impacting the sealing ball 4. The spring 5 is compressed, pushing the sealing ball 4 open, revealing a gap, and the exhaust valve opens, allowing air to flow out through the central cavity of the spring seat 6. When the gas pressure in the well falls below the set pressure of the exhaust valve, the elastic thrust of the spring 5 seals the sealing ball 4 against the valve seat 3, closing the exhaust valve. This automatic exhaust cycle repeats. When the gas pressure in the well is too high and the sealing ball 4 squeezes the spring 5 against the central cavity of the spring seat 6, creating a risk of airflow suffocation, the gas can flow through the circular exhaust hole 11 and the arc-shaped exhaust hole 13 in the spring seat 6, fundamentally preventing air suffocation and ensuring safe production. For ease of identification, this utility model is designated as HWP.

Claims

1. An oilfield wellhead anti-corrosion automatic exhaust valve, comprising a tubular valve body, both ends of which are connected to pipelines via threads, a valve seat with a circumferentially embedded sealing ring installed on one side of the valve body inner cavity, and a sealing ball, a spring, and a spring seat installed in sequence from the inside to the outside on the other side, the spring seat having an external thread that engages with a corresponding internal thread of the valve body, and the sealing ball is sealed on the valve seat under the action of the spring, characterized in that: The two ends of the valve body are connected to the pipeline by threads, including one end with external threads and the other end with internal threads, both ends with external threads or both ends with internal threads; a pressure cap is installed on the outside of the valve seat, and the pressure cap cooperates with the corresponding internal threads of the valve body with its external threads; the spring seat includes a cylinder body and a ring bulge at its bottom end, and a number of vertical circular exhaust holes are evenly arranged around the cylinder body, and a number of vertical arc-shaped exhaust holes are arranged around the cylinder body from the middle to the inside at intervals between the circular exhaust holes, and the arc-shaped exhaust holes are opened inward along the arc at the corresponding ring bulge position; the sealing ring, spring, sealing ball, valve body, valve seat, pressure cap and spring seat are all made of corrosion-resistant materials.

2. The oilfield wellhead anti-corrosion automatic exhaust valve according to claim 1, characterized in that: The number of the circular exhaust holes is set to 3 to 8.

3. The oilfield wellhead anti-corrosion automatic exhaust valve according to claim 1, characterized in that: There are no less than 3 arc-shaped exhaust holes.

4. The oilfield wellhead anti-corrosion automatic exhaust valve according to claim 1, characterized in that: The valve body is provided with a pressure gauge installation port at the front or rear thereof.

5. The oilfield wellhead anti-corrosion automatic exhaust valve according to claim 1, characterized in that: A locking cap is installed on the outer side of the spring seat, and the locking cap is matched with the corresponding internal thread of the valve body through its external thread.

6. The oilfield wellhead anti-corrosion automatic exhaust valve according to claim 1, characterized in that: The pressing cap is provided with a plurality of blind holes.

7. The oilfield wellhead anti-corrosion automatic exhaust valve according to claim 6, characterized in that: There are no less than 2 blind holes.

8. The oilfield wellhead anti-corrosion automatic exhaust valve according to claim 1, characterized in that: The sealing ring is made of hydrogenated nitrile rubber.

9. The oilfield wellhead anti-corrosion automatic exhaust valve according to claim 1, characterized in that: The spring is a stainless steel spring.

10. The oilfield wellhead anti-corrosion automatic exhaust valve according to claim 1, characterized in that: The sealing ball, valve body, valve seat, pressure cap and spring seat are all made of stainless steel.

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