DEVICE INTENDED FOR GAS WITHDRAWAL FROM ANNULAR SPACE IN OIL WELL Russian patent published in 2015 - IPC E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to the oil industry and may be used in producing wells to reduce the pressure of a separated associated gas in the annular space and to increase oil inflow from the formation. The device intended for gas withdrawal from the annular space in an oil well is comprised of a pump cylinder for inlet and outlet of the pumped fluid, a plunger in the barrel, return valves mounted at both sides of the cylinder and connecting the cavity of the cylinder with the annular space of the well. The plunger in the cylinder is made as two pistons connected by a rod. The rod passes through the cylinder gasket, at both sides of which product inlet and outlet lines are connected to the cylinder through a flow switch. One of the lines is connected to a discharge collector of the well up to a disconnecting gate in the collector while the other one is connected downstream the above line. Gas lines from the tubular annulus are connected to both ends of the cylinder through one pair of return valves; through the other pair of valves the cylinder ends are connected to the discharge collector downstream the disconnecting gate. In the cylinder ends there are electric contacts connected to a solenoid drive of the flow switch.

EFFECT: potential gas withdrawal from the annular space to the discharge collector of the well for different techniques of mechanised oil extraction.

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