APPARATUS AND METHOD FOR DRILLING A WELL

摘要

A method for forming a controllable bend angle in a drill string in a wellbore comprises attaching an upper housing to a drill string. At least, one drive motor is anchored in the upper housing. A. middle housing is operably coupled to the at least one drive motor. A lower housing is operably coupled to the at least one drive motor. The at least one drive motor is controHabiy operated to rotate the middle housing by a first rotation angle with respect to the upper.housing, and to rotate the lower housing by a second rotation angle with respect to the upper housing, to generate a desired bend angle between the middle housing and the lower housing at a target toolfaee orientation between the bend angle and the upper housing.