Adjustable fixed choke valve

Abstract

The invention relates to an adjustable fixed nozzle valve, wherein, the frame contains a valve body and a nozzle pressure reducer with a fluid channel; the nozzle valve body is arranged with several fixed nozzles in different apertures; the valve element can be rotated to communicate the valve element channel with the axial channel and the radial channel, to switch nozzles without closing the valve, to prolong the application period of fixed nozzle, reduce the flow speed of high-pressure gas with liquid and reduce the corrosion of gas tube. The pressure reducer is mounted with an internal taper nozzle, while the high-pressure gas is accelerated by the nozzle to reduce the pressure to flow outside the nozzle valve, to control the pressure difference of oil well. The invention has simple installment and easy cleaning, while it can be used to control the pressure difference and reduce the pressure at the gas opening, as well as reduce the noise in the pressure reduction of high-pressure fluid.

Description

technical field [0001] The invention belongs to the field of wellhead control devices for oil and gas production developed in oil and gas fields, and relates to an adjustable fixed nozzle valve. Background technique [0002] In the process of oil and gas field development, the valve sleeve type fixed nozzle is usually used to control the production pressure difference of oil and gas wellhead. This valve sleeve type fixed nozzle is mainly composed of the nozzle sleeve shell, fixed nozzle, end cover and fluid inlet and outlet. The thread is installed in the casing of the nozzle sleeve. When the diameter of the fixed nozzle needs to be changed, the well can only be shut down and the end cover of the nozzle sleeve removed after pressure relief to replace the fixed nozzle. It takes at least 30 minutes to replace the fixed nozzle, which is time-consuming and laborious. Delayed working hours , while affecting the service life of the fixed nozzle, and the fixed nozzle of this struct...

AI Technical Summary

Problems solved by technology

[0002] In the process of oil and gas field development, the valve sleeve type fixed nozzle is usually used to control the production pressure difference of oil and gas wellhead. This valve sleeve type fixed nozzle is mainly composed of the nozzle sleeve shell, fixed nozzle, end cover and fluid inlet and outlet. The thread is installed in the casing of the nozzle sleeve. When the diameter of the fixed nozzle needs to be changed, the well can only be shut down and the end cover of the nozzle sleeve removed after pressure relief to replace the fixed nozzle. It takes at least 30 minutes to replace the fixed nozzle, which is time-consuming and laborious. Delayed working hours At the same time, it affects the service life of the fixed nozzle, and the fixed nozzle with this structure needs frequent maintenance during the oil and gas well production process, which brings a lot of inconvenience to installation and cleaning

[0003] After the high-pressure gas with high liquid content is throttled by the oil nozzle or the oil nozzle valve, the flow rate is greatly increased, and the pipeline close to the oil nozzle or the oil nozzle valve will have erosion similar to the cavitation of the centrifugal pump, resulting in serious corrosion of the gas collection pipeline.

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