METHOD FOR CONTROL OF WHIPSTOCK IN DRILLING WELL BY UNIT WITH BOTTOM-HOLE MOTOR Russian patent published in 2000 - IPC

FIELD: oil and gas production industry. SUBSTANCE: method relates to technology of construction of inclined-directed wells so as to ensure required direction of well bore without removal of system to ground surface. According to method, well is drilled together with whipstock which is rigidly connected to drilling string. In process of drilling, actual value of azimuth direction of bore drilling is measured by means of magnetometer. Measured values are sent to microprocessor where comparison takes place of measured values and preset programmed parameter of azimuth direction corresponding to given depth. If actual measured values come to be different from design values, processor sends signal to orientator for breaking rigid link between whipstock and drilling string. Coincidence of direction of whipstock operation with designed azimuth is achieved by successive step-by-step turning of whipstock in counterclockwise direction due to action of reactive moment of bottom-hole motor. After positive alignment of direction of whipstock action with designed azimuth of well bore, processor sends signal for disengagement of orientator and restoration of rigid link between whipstock and drilling string. Application of method allows for increasing accuracy of installing whipstock through entire circular spectrum of azimuth drilling from zero to 360 deg. EFFECT: higher efficiency. 2 cl, 5 dwg