PIPELESS ELECTRIC DOWNHOLE MOTOR Russian patent published in 2002 - IPC

FIELD: oil and gas industry, particularly, devices for well drilling and reaming by electric downhole motor on cable. SUBSTANCE: upper flange of electric motor body of downhole motor has bushing which is connected by means of axial rotation bearing to upper nonrotating part of electric downhole motor. Lower flange of electric motor body is added with a hollow cylinder to which external shaft and core drilling bit are secured. Attached to lower end of electric motor rotor hollow shaft is internal shaft with pilot drilling bit for drilling of central part of bottom hole. EFFECT: higher operating reliability and efficiency. 1 dwg