SUBMERGED-TYPE CENTRIFUGAL PUMPING UNIT Russian patent published in 1999 - IPC

FIELD: extraction of oil from wells. SUBSTANCE: pumping unit has submerged electric engine and module sections 8,10 interconnected by movable device which is formed as sleeve-base 3. Movable device is screwed with its one end into casing of upper section 10 of pump and connected with its other end to spherical segment 5 by threaded connection and threaded captive nut. Spherical segment 5 has flexible sealing member 4. Nut 6 joins sleeve-base 3 with casing 7 of movable device. Stop 9 is positioned between segment 5 and casing 7. Flanged part of casing 7 is fixed in lower section 8 of pump. Shafts 1 of sections 8 and 10 are connected through spline coupling 2 providing angular displacement of shafts 1. EFFECT: increased efficiency by eliminating action of bending force developed during lowering of pumping unit into inclined well. 2 cl, 1 dwg