METHOD FOR DRILLING A WELLBORE USING A BI-CENTER DRILL BIT

摘要

A method is disclosed for drilling a wellbore. The method includes operating a turbine-type mud motor having a bi-center drill bit coupled to i t, and applying an axial force to the bit which is selected so that the bit drills in a directionally stable manner. In one embodiment, the motor is a steerable mot or operated to maintain a selected trajectory of the wellbore.