DOWNHOLE FLOWMETER Russian patent published in 1994 - IPC

FIELD: well drilling. SUBSTANCE: downhole flowmeter has centralizer of mud flow ensuring full closing of borehole in stable deposits, except for caverns, and including springy strips 19 whose ends are hinged to bushings 2 which freely move over rod ribs 1 up to their stops and diaphragm made of flexible material with central hole encircled by ring 6, and impeller 17 attached to middle of springy strips 19. Upper end of shaft 16 is needle-like thrusting conical depression of stop 10 and lower end to which impeller 17 is secured has conical depression with which shaft is fitted on needle 6 to provide for free and stable rotation of impeller. EFFECT: higher efficiency. 4 dwg