DEEP-WELL ELECTRICALLY DRIVEN CENTRIFUGAL PUMP UNIT Russian patent published in 2010 - IPC F04D13/10 F04D29/58 F04D29/70 

FIELD: engines and pump.

SUBSTANCE: invention relates to oil production by deep-well electrically drive pumps and can be used for extracting oil with high content of mechanical impurities. Proposed unit comprises motor 3 cooled by pumped fluid and centrifugal pump 1 with intake screen. Said unit is accommodated inside casing 5 with circular gap. Valve assembly 6, carcass-wire filter 7 and accumulator 8 are consecutively attached to casing 5 from below. From above, said casing is attached to tubing string. Aforesaid carcass-wire filter 7 is made up of bearing rod, tubular carcass and filter shell. Note here that tubular carcass has lengthwise slots, tubular carcass outer surface being furnished with triangular thread. Filter shell is made from triangular-section wire with slots made between wire turns to expand inward the structure.

EFFECT: increased mean time between repairs, high-efficiency cooling.

4 dwg