HYDRAULIC DOWNHOLE MOTOR Russian patent published in 2016 - IPC E21B4/02 F01C1/08 F04C2/08 

FIELD: mining.

SUBSTANCE: invention relates to hydraulic drives for rotary drilling, arranged in wells, and can be used for rotary drilling of side horizontal shafts of oil wells. Downhole motor comprises a tubular body arranged inside multithread screw gerotor mechanism including a stator with lining from elastomer and arranged in stator rotor and spindle section including a shaft installed on axial support in form of a thrust-radial multi-row bearing, as well as on upper and lower radial plain bearings, consisting of outer and inner sleeves arranged in housing of the transmission section, and on transmission section shaft. Transmission section shaft secured at input drive shaft with rotor, while its outlet is connected to bit. Engine is equipped with upper catching device consisting of a shaft, stop and a nut, and lower catching device made in form of a fishing sleeve with outer collar, thrust ring and threaded adapter. Upper catching device connected to upper part of rotor of screw gerotor mechanism, and lower retarder is installed on transmission section shaft between internal sleeve lower radial plain bearing and axial support in form of a thrust-radial multi-row bearing. Transmission section shaft and fishing sleeve of lower catching device with fishing collar rigidly jointed together by means of common thread. Thrust ring is made detachable and is installed inside housing of transmission section directed to each other ends of threaded adapter and external ring of thrust-radial multi-row bearing. Fishing collar in fishing sleeve is arranged between thrust-radial multi-row bearing and thrust ring. Diameter of fishing collar of fishing sleeve exceeds diameter of holes of thrust ring. Diameter of holes of lower radial plain bearing exceeds diameter of fishing collar.

EFFECT: reduced accident rate, longer life and reliability, accuracy of well drilling, rate of set of parameters of curvature of well and flotation.

6 cl, 5 dwg