GEROTOR HYDRAULIC MOTOR Russian patent published in 2010 - IPC E21B4/02 

FIELD: oil-and-gas production.

SUBSTANCE: motor contains tubular casing, located inside it multiple-thread helical gerotor mechanism, including stator with armature made of elastomer and installed inside the stator rotor, and also spindle with straight bit and drive shaft containing one cylindrical external thread (pin) and one cylindrical internal thread (clutch) connected to each other. Casing is outfitted by threaded adapter connector for connection to column of drill pipes and by several thread reducing subs connecting casing to spindle. Internal channel of threaded adapter connector is implemented with slip butt, inside threaded adapter connector it is located threaded piston, by one end connected to rotor and at the other end of piston it is fixed slip ring. At least one threaded connection with external and internal straight threads for passing of rotational moment from motor rotor through drive shaft and spindle shaft to straight bit, contains two pairs of persistent butts and in clutch before the first coil of internal straight thread enveloping centering face, and also contains in nipple out of threaded channel and joining to it enveloping centering surface. Minimal distance between persistent butt of clutch, located from the side of the first coil of internal straight thread, and the first coil of internal straight thread is equal to half of middle diametre of straight thread of threaded connection, located from the side of the first coil of internal straight thread and by the first coil of internal straight thread is equal to middle diametre of straight thread of the threaded connection.

EFFECT: there are increased reliability and resource, increased rotational moment, there are prevented failures and emergencies in consideration of turning away of threaded connections of rotating layouts of motor with straight bit in well.

6 cl, 4 dwg, 1 tbl, 1 ex