Pilot-operated type self-holding electromagnetic valve for gas well mouth

Abstract

The invention discloses a pilot-operated type self-holding electromagnetic valve for a gas well mouth, which is applied to natural gas well fields and gas pipelines. The pilot-operated type self-holding electromagnetic valve for the gas well mouth is characterized in that: a cylindrical main spool is arranged inside a valve body; a valve cap is fixed on the upper part of the valve body; a pin electromagnetic head, a primary opened electromagnetic head and a secondary opened electromagnetic head are transversely connected to the side wall of the valve cap; an auxiliary spool is cylindrical, ofwhich the lower end is arranged inside the main spool; an upper compression spring and a lower compression spring are arranged inside the auxiliary spool; a core rod is arranged in the lower compression spring; a balance pressure hole is formed in the valve body and the auxiliary spool; and a communicating hole is formed between the valve body and the valve cap; a pressure relief hole is formed on the valve cap; and an annular groove is formed on an outer wall of the auxiliary spool. The pilot-operated type self-holding electromagnetic valve for the gas well mouth has the advantages that: thepilot-operated type self-holding electromagnetic valve is suitable for pipelines of the natural gas well mouth, and the opening / closing of the valve is finished depending on weak electromagnetic force under the condition of not depending on the drive of an external air supply. After the pilot-operated type self-holding electromagnetic valve is cooperated with a remote control system, functions ofremote control of the opening / closing of a single well, automatic protection at high / low voltage and the like can be realized. Due to double-stage driving of the spool, the main spool is completely opened. The problem of inner leakage resulted from freezing blockage and sand accumulation caused by the throttling effect of the electromagnetic valve with the conventional structure can be solved.

Description

technical field [0001] The invention relates to the technical field of oilfield gas recovery, in particular to an electromagnetic-pneumatic switch valve on a natural gas well site and a gas transmission pipeline. A solenoid valve used in the natural gas production process does not need electricity and pressure difference between front and back to maintain its state after opening, specifically, it is a new type of pilot-operated self-holding solenoid valve. Background technique [0002] During the production process of natural gas wells, when the downhole throttling process is used for production, the wellbore and surface pipelines can be designed with medium and low pressure. At this time, in order to prevent the failure of the downhole choke to damage the downstream medium and low pressure pipelines and corresponding equipment, and to prevent a large amount of natural gas leakage caused by the rupture of the downstream pipeline, the wellhead needs to install a high and low ...

AI Technical Summary

Problems solved by technology

To overcome the current problem that the solenoid valve core of the wellhead solenoid valve in the gas field cannot be fully opened

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