Control valve and intermittent well intelligent control system adopting control valve

Abstract

The invention discloses a control valve. The control valve comprises a valve seat, wherein a channel allowing a medium to flow is arranged in the valve seat, a main valve body and an auxiliary valve body are sequentially arranged in the valve seat in the medium flow direction, the main valve body is used for completely opening or completely closing the channel, the auxiliary valve body is used foradjusting the opening degree of the channel, the auxiliary valve body is a sliding plate capable of reciprocating in the radial direction of the channel, the surface of the sliding plate is divided into an open hole region and a non-open hole region, and the reciprocating sliding plate can adjust the opening degree of the channel through the change of the position relationship between the open hole region and the non-open hole region and the channel. The control valve can ensure stable pipeline pressure to a great extent to achieve normal production.

Description

technical field [0001] The invention relates to the technical field of gas field development, in particular to a control valve and an intelligent control system for intermittent wells using the control valve. Background technique [0002] With the large-scale development of gas fields, the production capacity of gas wells gradually decreases, and low-production gas wells cannot fully meet the production requirements due to low production. In view of this situation, on the basis of analyzing the existing production techniques and technologies of low-yield gas wells at home and abroad, intermittent shut-off wells are adopted to meet the production needs of low-yield gas wells. Intermittent well switching is a method to achieve the purpose of carrying liquid and resuming production by relying on the energy recovery of the gas well itself. It has become an indispensable measure for stabilizing and increasing production in the later stage of gas well production. When implementin...

AI Technical Summary

Problems solved by technology

[0003] At present, most valves use electric smart throttle valves (needle valves), which drive the valve stem through electric actuators to act on the valve core to open and close the valve and adjust the valve opening; but the valve uses a direct-acting opening method, which will cause opening torque It is relatively large, so it is necessary to use a relatively high-power power to realize the opening of the valve, which requires high power. At the same time, the valve core of the valve is needle-shaped, its adjustable ratio is small, and the pressure adjustment accuracy is small. Angle type, the valve core is severely eroded, and it will have a great impact on the seal if it is used for a long time

In actual operation, the more commonly used valves are pneumatic diaphragm valves, which are composed of a spring and a driving cylinder, and the cylinder is driven to reciprocate by controlling the driving air source (pipeline medium), thereby controlling the main spring and acting on the valve core to switch valve and adjust the opening of the valve; because the pneumatic membrane valve depends on the pipeline medium, sometimes there will be liquid flow and pressure fluctuations in the pipeline, which will inevitably cause the instability of the downstream pressure and cannot effectively protect the normal production of the pipeline. Severe erosion, long-term use will also have a great impact on the seal

In addition, in the prior art, a right-angle stop valve is also used. When the high-pressure gas passes through the valve, the energy loss is relatively large, which will cause the gas temperature to drop suddenly, and there may be freezing phenomenon, which will affect the normal use of the valve.

[0004] In addition, the above-mentioned types of valves used in on-site operations cannot be dealt with in a timely manner for emergencies, such as abnormal pipeline pressure, which may cause some losses and affect normal production.

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