CENTRIFUGAL OIL-WELL PUMP STAGE Russian patent published in 2003 - IPC

FIELD: oil mechanical engineering; centrifugal multi-stage oil-well pumps for pumping formation fluid. SUBSTANCE: proposed stage of centrifugal oil-well pump includes guide apparatus and impeller mounted in this apparatus. Mounted on lower surface of drive disk are impeller blades; drive disk is provided with holes found between bases of blades. Lower edges of blades are open on side of upper disk of guide apparatus. On periphery part of upper surface of impeller drive disk there is shoulder where additional fins of impeller are located. Holes are made between axis of rotation of impeller and additional fins of impeller. Upper surface of impeller drive disk is located opposite lower disk of guide apparatus of next stage. Shoulder formed on peripheral part of lower surface of lower disk of guide apparatus of said stage is used for fitting lower fins of lower disk of guide apparatus of next stage. EFFECT: enhanced efficiency of crushing gas bubbles and mud inclusions. 16 cl, 7 dwg