SMALL-SIZE SPIRAL-TYPE DOWN-HOLE MOTOR Russian patent published in 1998 - IPC

FIELD: bore-hole drilling equipment. SUBSTANCE: this relates to down-hole motors for drilling oil and gas wells. Down-hole motor for drilling horizontal wells has rubber-coated stator, hollow rotor, tubular torsion bar, shaft, supporting unit. Motor shaft is located inside tubular torsion bar and hollow rotor. Supporting unit located in upper part of motor in flushing liquid delivery zone is made in the form of double-side sliding bearing having its sliding working surfaces reinforced with hard-alloy cylindrical inserts located concentrically relative to motor axis and having axial and radial passages for cooling and lubrication of rubbing surfaces with flushing liquid. EFFECT: high efficiency. 2 dwg