METHOD TO CONTROL PROCESS OF DRILLING BY DOWNHOLE HYDRAULIC MOTOR Russian patent published in 1996 - IPC

FIELD: drilling of oil and gas holes. SUBSTANCE: in drilling with varied pressure differential, control is based on monitoring changes mode of loading downhole hydraulic motor and optimization of its mode of operation through regulation of axial thrust of drill bit. Measured are variations of parameter of drill pump drive motor condition which characterizes dynamic mode of pump drive operation. This parameter can be represented by angular velocity of motor and also by circuit current or temperature of motor windings. This makes unnecessary communication link with downface and special downface sensor of angular velocity of hydraulic motor and it increases drilling capacity and reliability and reduces cost of drilling control system. EFFECT: high efficiency. 3 cl, 5 dwg