ASSEMBLY FOR HYDRAULIC DOWNHOLE MOTOR, METHOD OF PRODUCING DOWNHOLE MOTOR AND METHOD OF MAKING STATOR OF DOWNHOLE MOTOR Russian patent published in 2016 - IPC E21B4/02 F01C1/10 

FIELD: engines and pumps.

SUBSTANCE: group of inventions relates to downhole screw motors and pumps. Assembly of hydraulic downhole motor comprises volume or screw downhole motor with inlet and outlet end. Engine comprises stator and rotor, surface of stator is made from flexible material to provide formation of sealing between contacting surfaces of rotor and stator; at least one device located between stator and rotor nearby, at least one of inlet end and outlet end with said device is selected from group comprising wheel unit containing wheel attached to rotor; fixed insert installed inside stator; piston assembly with multiple pistons connected with stator; and precessional device containing gear wheel coupled with rotor, wherein said at least one device limits radial and/or tangential motion of rotor relative to stator.

EFFECT: providing control of rotor position relative to stator.

27 cl, 18 dwg