HYDRAULIC DOWNHOLE MOTOR Russian patent published in 2014 - IPC E21B4/02 

FIELD: oil and gas industry.

SUBSTANCE: device contains a hollow body with a gerotor screw mechanism inside that includes a stator placed in the body coaxially and a rotor installed inside the stator and the rotor rotation is carried out by fluid delivered by the pump, a transmission section that includes a shaft mounted at the axial bearing made as a multirow thrust and radial bearing and at the upper and lower radial skid bases consisting of the outer and inner sleeves placed in the transmission section body and respectively at the transmission section shaft; the transmission section shaft is fixed at the input by a drive shaft with a rotor and at the output it is fixed with a chisel; the motor is equipped with the upper collar grab consisting of a shaft, a thrust and a nut and the lower collar grab made as a fishing collar with the outer fishing clamp, a thrust collar and the lower threaded crossover with an inner fishing clamp; the upper collar grab is fixed to the upper part of the gerotor screw mechanism while the lower collar grab in mounted at the transmission section shaft between the inner sleeve of the lower radial bearing and the axial bearing made as a multirow thrust and radial bearing. The transmission section shaft and the fishing collar of the lower collar grab with the outer fishing clamp are fixed rigidly with each other by means of a common thread thus providing tightness at butt ends of the thrust collar placed between butt ends of the fishing collar and the inner collar of the lower radial skid base. Cross-threading direction of the transmission section shaft and the fishing collar of the lower collar grab coincide with the direction of drill string rotation during tripping out.

EFFECT: improving accident-free operation, service life and reliability of motors, accuracy of hole making and the rate of parameters set for the hole curvature and passing ability.

5 cl, 2 dwg