PUMPING PLANT FOR GAS WITHDRAWAL FROM ANNULAR SPACE IN OIL WELL Russian patent published in 2017 - IPC E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: pumping plant includes two tanks with gas lines leading to them, connected to the annular space in the well, and discharge gas lines connected to the flow header of the well. Suction and discharge valves are installed respectively on the supply and discharge gas lines. There are also a pump for pumping working fluid and lines for fluid inflow and outflow in the lower parts of both tanks. Each of the lines is provided with receiving and outlet sides of the transfer pump. Between the pump and tanks there is a fluid flow switch, flexible stretchable membranes are placed in every tank. They hermetically divide the tanks into two equal parts. The space of each container above the membrane is filled with a liquid of a volume equal to the volume of dead space above the membrane in the gas line between the upper point of the tank and the valves for entering and exiting the evacuated gas in the cycle of its displacement from the tank.

EFFECT: increase of reliability and operational efficiency of the liquid transfer pump to the tank to displace gas from them to the pressure line.

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