METHOD FOR BOREHOLES (VERSIONS) OPERATION AND DEVICES FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC E21B43/00 F04D13/10 

FIELD: oil and gas industry.

SUBSTANCE: formation fluid is produced by the plant, including tightly screwed lifting pipes, motor and electric centrifugal pump. Actually the electric centrifugal pump contains the head, the base with inlets for formation fluid and levels to increase the pressure and dissolution of free gas in the formation fluid. The return and knock-off valves are installed above the pump. The gas exhaust unit with the normally opened return valve is installed at the upper part of the electric centrifugal pump above its stages upto the return valve. With this valve, when stopping the electric centrifugal pump, connect its pressure area with the annular space and reduce the pressure in the electric centrifugal pump upto the pressure in the annular space. This provides extraction of dissolved gas and its subsequent extrusion into the annular space by the formation fluid. When restarting the plant, increase the pressure in the electric centrifugal pump and provide closing of the gas exhaust unit return valve, which provides regular operation of electric centrifugal pump.

EFFECT: increasing of the borehole operation reliability due to the gas removal from the pump inner part, when it is stopped.

4 cl, 2 dwg