DOWNHOLE HYDRAULIC MOTOR Russian patent published in 2003 - IPC

FIELD: drilling, hydraulic drives located in holes. SUBSTANCE: downhole hydraulic motor has frame possessing member for connection to drill stem, space to feed flushing fluid, shaft carrying at least one turbine wheel with spiral blades mounted for rotation in space to feed flushing fluid and at least one stator element with conduits directing fluid flow and with internal surface embracing side external surface of turbine wheel. Spiral blades come in the form of spiral grooves cut in section of side external surface of turbine wheel which length is shorter than its length over generating line. Conduits directing fluid flow are cut in the form of longitudinal grooves arranged in two groups in internal surface of each stator element with formation of separation section between groups over periphery. Number of spiral grooves is equal to number of longitudinal grooves located in one plane of cross- section. EFFECT: simplified design and technology of manufacture of downhole hydraulic motor. 6 dwg