HYDRAULIC DOWNHOLE MOTOR Russian patent published in 2009 - IPC E21B4/00 

FIELD: engines and pumps.

SUBSTANCE: invention is related to hydraulic drives for rotary boring installed in wells, namely to lower radial supports of spindle sections sliding, and may be used in hydraulic gerotor helical engines and turbodrills for drilling of inclined and horizontal oil and gas wells. Shaft of hydraulic downhole motor spindle is connected by driving shaft to rotor and is fixed to chisel, bodies of engine and spindle are fixed by threaded sub, lower radial support of spindle is fixed by nipple joined to spindle body by conical thread, diametres of nipple and body of spindle are arranged as identical, spindle shaft is arranged with catching collar, and nipple is arranged with catching belt. Planes of spindle body section by indent of the first coupled turn of nipple turn, and also nipple section by indent of the first coupled turn of spindle body thread are located in axial direction within the limits of working surface of lower radial sliding support, accordingly from edge of lower radial support directed to axial support, and also from edge of lower radial support directed to chisel, at the distance that is at least equal to total thickness of spindle body walls and nipple in their threaded joint, at that distance between edge of working surface of lower radial support and closer edge of axial support is equal to at least distance between planes of spindle body section by indent of the first coupled turn of nipple thread and section of nipple by indent of the first coupled turn of spindle body thread.

EFFECT: increases resource and reliability of motor spindle, increases accuracy of inclined and horizontal wells tunneling, rate of wells curvature parametres gain, reduces resistances and stresses in drill pipe string bottom layout due to reduction of spindle length and chisel projection, increases strength of spindle body threaded joint to nipple via radius sections of well shaft under conditions of friction and rotation in well shaft.

7 cl, 5 dwg