CONTROLLED SUBMERSIBLE ELECTRIC CENTRIFUGAL PUMPING UNIT Russian patent published in 2002 - IPC

FIELD: oil producing industry. SUBSTANCE: invention relates to liquid producing equipment and it can be used in drives of submersible electric centrifugal pumps in oil wells. proposed pumping unit has submersible electric centrifugal pump, submersible electric motor and control device. The latter is made in form of differential mechanism one central wheel of which is connected with shaft of electric motor, and the other is connected with shaft of pump through shaft of control device. planet pinion carrier of differential mechanism in connected through step-up reduction gear with shaft of hydraulic gear pump. Inlet branch pipe of pumps is connected with inner space of control device oil-filled housing, and outlet branch pipe is connected with crank-opened valve connected through gear with round rack. Round rack is connected with gear pump load transmitter made in form of cam clutch spring loaded in axial direction. EFFECT: simplified design owing to dispensing with thyristor frequency converter, bottom-hole pressure gauge and union, improved reliability of unit owing to provision of automatic mechanical control of pump operation through feedback between parameters of well fluid and unit. 1 dwg