Oil well casing pressure control device

Abstract

The invention belongs to the technical field of oil production engineering and particularly provides an oil well casing pressure control device. The oil well casing pressure control device comprises a valve body, wherein a pressure cap is connected with the inner side of the front end of the valve body; a ball seat, a stop steel ball and a steel ball push rod are mounted inside the valve body in a sleeving manner; the ball seat is connected with the pressure cap; the stop steel ball is arranged between the ball seat and the steel ball push rod; a pressure regulating valve is mounted on the inner side of the steel ball push rod in a sleeving manner; a pressure regulating spring is connected with the outer side of the pressure regulating valve in a sleeving manner; the pressure regulating spring is connected with the steel ball push rod; the outside of the tail part of the valve body is connected with a tail cap; one side wall of the tail cap is connected with a pressure regulating connector; the pressure regulating connector is communicated with a pressure regulating cavity of the valve body; the valve body between the stop steel ball and the pressure regulating valve is provided with an exhaust connector. According to the oil well casing pressure control device, an opening pressure of the stop steel ball is regulated by the pressure regulating connector; automatic control on a casing pressure is realized; the problem of large labor workload of controlling the casing pressure of an oil well is solved; oil pumping efficiency and system efficiency are improved; meanwhile, associated gas can be recovered; emission is eliminated; and environmental pollution and potential safety hazards are reduced.

Description

technical field [0001] The invention belongs to the technical field of oil production engineering, and in particular relates to an oil well casing pressure control device. Background technique [0002] A large amount of natural gas dissolved in formation oil reservoirs under high temperature and pressure is called dissolved gas. In crude oil production, dissolved gas is the main driving force for oil displacement, relying on the expansion and separation of gas to drive crude oil from formation pores to production wells. As the fluid enters the production well, the pressure gradually decreases, and the dissolved gas gradually separates from the crude oil into free gas, which expands slowly until it leaves the crude oil and enters the annular space of the oil casing. This part of the gas is casing gas. [0003] However, if the gas pressure control of the casing is unreasonable or the gas is opened, it will not only reduce the filling coefficient of the oil well pump, produce ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a casing pressure control device for oil wells, which overcomes the problems of large manual workload and low efficiency in oil well casing pressure control in the existing crude oil production, and cannot realize automatic control of casing pressure

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