Self-controlled oil well casing gas recycling device

Abstract

The invention discloses a self-controlled oil well casing gas recycling device. A liquid feeding tee joint and a stroke push rod sealer are respectively connected to the front end and the rear end of a series-connection type piston pull rod hydraulic cylinder; a push rod reversing rocker arm rack is connected between the stroke push rod sealer and a reversing valve left end and right end reversing push rod sealer; liquid feeding and draining manifolds (A and B) are arranged at the lower end of the hydraulic cylinder; upper portions of two gas feeding one-way valves are connected with a gas feeding hole of the hydraulic cylinder; lower portions of the two gas feeding one-way valves are connected with a casing gate of a wellhead Christmas tree; upper portions of two gas discharging one-way valves are connected with a gas discharging hole of the hydraulic cylinder; lower portions of the two gas discharging one-way valves are connected with a liquid draining tee manifold connected to a T port of a reversing valve; a liquid feeding one-way valve of a liquid inlet of a P port of the reversing valve is connected with a production liquid draining gate of the wellhead Christmas tree; and the liquid draining tee manifold at the position of a liquid draining manifold of the T port of the reversing valve is connected with a production main line. Problems that oil well casing gas builds the pressure for a long time, an oil well working fluid level is reduced, capacity is reduced, and gas locking is caused are solved.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a casing gas recovery device. Background technique [0002] In the middle and late stage of oilfield production and development, many oil production blocks have a certain amount of geological blocks with low permeability oil storage structure. The main characteristics are low production, low pressure of casing gas in oil wells, and it is difficult to use and recover casing gas in the production process. , part of the natural gas accumulates in the annular space of the oil casing, resulting in a decrease in the production capacity of the oil well. In severe cases, it will cause the phenomenon of "air lock", and the discharge will cause pollution to the atmosphere. At the same time, it also wastes precious and non-renewable clean resources. A vicious circle has formed. At present, most of the mature and applied products are constant pressure release valves, whic...

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Problems solved by technology

The other is to install a cylinder on the support of the pumping unit, and the cylinder rods are fixed on the beam of the pumping unit to connect with each other to realize reciprocating movement. The disadvantages are high installation costs, difficult maintenance, and sometimes the cylinder will be deactivated and the oil will be pumped. The fatal flaw of the top flip

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