DOWNHOLE MOTOR, DRILLING DEVICE AND DRILLING UNIT Russian patent published in 2001 - IPC

FIELD: well drilling. SUBSTANCE: combination of downhole motors comprises drilling devices. Downhole motor has stator and rotor located in stator for rotation. Stator has two opposite hollows for rods and two opposite discharge windows. During operation, moving fluid medium is supplied by pump through rotor central channel and through several radial channels running to working channels between rotor and stator. Rotor has two opposite seals engageable with stator. Each hollow accommodates rod which during operation also forms seal between stator and rotor. Seals and rods may be made of different materials including stainless steel. Two downwards motors may be arranged parallel with their rotors shifted in phase to produce uniform output power and to prevent their stopping. Combination of drilling device with drilling tool and drill string comprises drilling unit for well drilling with the help of downward motor. EFFECT: higher operating reliability of downhole motor at temperatures exceeding 120 C. 13 cl, 10 dwg