Constant-pressure valve device for oil and gas well mouth

Abstract

The invention provides a constant-pressure valve device for an oil and gas well mouth. The constant-pressure valve device for the oil and gas well mouth comprises a valve body, a valve ball seat, a valve rod and a spring; the valve body is of a three-way structure and comprises a valve body inlet end, a valve body outlet end radially extending along the valve body and a valve body pressure adjusting end which is axially opposite to the valve body inlet end; the valve ball seat is installed in the valve body inlet end, and a valve ball is arranged on the valve ball seat; the spring is arrangedin the valve body and used for providing a pressure value of the constant-pressure valve device; the valve rod is arranged at the valve body pressure adjusting end and used for adjusting the elastic force of the spring; and one end of the spring is fixedly connected with one end of the valve rod, the other end of the spring is used for compressing the valve ball on the valve ball seat, therefore,oil and gas only can enter the constant-pressure valve device from the valve body inlet end and be discharged from the valve body outlet end, and the elastic force of the spring can be adjusted by rotating and adjusting the valve rod so as to set the pressure value of the constant-pressure valve device.

Description

technical field [0001] The invention relates to the technical field of wellhead blowout prevention and leakage prevention equipment, in particular to a constant pressure valve device used for oil and gas field wellheads. Background technique [0002] In recent years, with the development of oilfields, the requirements for oilfield wellhead equipment are getting higher and higher. Usually, a constant pressure valve is installed at the wellhead to adjust the wellhead pressure and avoid the risk of well control. [0003] However, some problems still exist in the existing pressure relief constant pressure valve. For example, with the increase of gas injection wells in the oil field, the oil casing pressure at the wellhead reaches above 40MPa, and the common constant pressure valve is welded as a whole, so the pressure bearing level is 15MPa, which is difficult to reach the equipment pressure level, and there is a risk of well control. During the process, the fluid will damage ...

AI Technical Summary

Problems solved by technology

For example, with the increase of gas injection wells in the oil field, the oil casing pressure at the wellhead reaches above 40MPa, and the common constant pressure valve is welded as a whole, so the pressure bearing level is 15MPa, which is difficult to reach the equipment pressure level, and there is a risk of well control. During the process, the fluid will damage the welding joint. When the flow rate is too fast, it will cut the welding joint, resulting in leakage, which poses a certain safety hazard

The traditional constant pressure valve does not have a pressure adjustment scale. When manually adjusting, it needs to be observed by on-site personnel. It can only be confirmed after it is confirmed that it is opened under the set pressure, resulting in the consumption of human resources and low efficiency.

In addition, when the traditional constant pressure valve adjusts the pressure, it is easy to cause the internal ball to fall off and be transferred into the outlet channel, so that the constant pressure valve loses its regulating effect

Moreover, the material of the traditional constant pressure valve has not been treated with anti-H2S

These have seriously affected the pressure regulation and constant pressure performance of the constant pressure valve.

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