Self-controlled oil well casing gas recovery device

Abstract

The invention discloses an autocontrol type oil well casing pipe gas recycling device which comprises two stages of pull rod piston hydraulic cylinders connected with each other in series, hydraulic stroke oil cylinders with energy accumulators, a hydraulic integration commutator and a hydraulic oil pressure drawing pipe. The front ends and the rear ends of the two hydraulic cylinders are provided with two paths of original oil liquid inlet and outlet manifolds AB respectively and connected with liquid inlet and outlet holes AB in the upper portion of the hydraulic integration commutator. The end, with a union, of the front end of a P opening liquid inlet manifold one-way valve is connected with a union at the front end of a production liquid discharge gate on a wellhead oil extraction tree. A liquid discharge manifold flange at an opening T of the hydraulic integration commutator is connected with a production oil delivery main line. Intake check valves of the two hydraulic cylinders are connected with hollow pipe plugs at the front end of a well opening casing pipe gate. Exhaust check valves of the two hydraulic cylinders are connected with a T opening liquid discharge manifold. By means of the autocontrol type oil well casing pipe gas recycling device, the technical problems that due to long-term pressure building of an oil well casing pipe, the oil well movable liquid level drawdown productivity is lowered, and gas locking and other phenomena are caused can be solved.

Description

technical field [0001] The invention relates to the technical field of oil production in oil fields, in particular to a casing gas recovery device. Background technique [0002] In the middle and late stages of oilfield production and development, many oil production blocks have a certain amount of geological blocks with low-permeability oil storage structures, which are mainly characterized by low production and low casing gas pressure in oil wells, and it is difficult to use casing gas during the production process. After recovery, part of the natural gas accumulates in the annular space of the oil casing, resulting in a decrease in the production capacity of oil wells, and in severe cases, the phenomenon of "air lock" will occur. If it is discharged, it will cause pollution to the atmosphere and waste precious and non-renewable clean resources, forming a vicious circle. At present, most of the maturely used products are constant pressure vent valves, which have the chara...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a self-controlled oil well casing gas recovery device to solve the technical problems of oil well casing gas holding pressure for a long time, which leads to the decline of oil well fluid level, lower production capacity and gas lock phenomenon.

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