GEROTOR HYDRAULIC ENGINE Russian patent published in 2009 - IPC E21B4/02 E21B7/08 

FIELD: engines and pumps.

SUBSTANCE: invention is related to hydraulic drives for rotary boring installed in wells and may be used in gerotor helical hydraulic engines for boring of inclined and horizontal oil and gas wells. Engine comprises hollow body with multiturn helical gerotor mechanism installed inside, and also spindle joined by driving shaft to rotor and to chisel at the outlet. Hollow body is fixed to threaded adapter for connection with drilling string, and threaded sub with bent central axis that joins hollow body with spindle. Elements of hollow body connection to adapter and sub are arranged with internal and/or external thread, for instance conical one. Hollow body of engine is arranged with belt of reduced rigidity, which is characterised by reduced thickness of hollow body wall installed between ends of helical teeth in elastomer facing. Ratio of reduced thickness of hollow body wall to external diametre of hollow body makes 0.065…0.095. Inertia moment of cross section of reduced rigidity belt of hollow body makes 0.945…1.055 from inertia moment of annular cross section in planes of highest or lowest external diametre of full turn of external or internal thread of threaded adapter and/or sub engaged with full turn of internal or external thread of hollow body, and/or highest or lowest external or internal diametre of full turn of internal or external thread of hollow body engaged with full turn of external or internal thread of threaded adapter and/or sub.

EFFECT: increases reliability and resource, accuracy of inclined and horizontal wells tunneling, rate of well curvature parametres gain, and also improves passability, ie reduces resistances and stresses in drill pipe string bottom layout.

3 cl, 4 dwg