Patent ID: 8191638

Claim:
A drill stem wrench, comprising: a first lever arm; a second lever arm coupled to the first lever arm; a pair of wrench jaws located at distal ends of the first and second lever arms, at least one of the wrench jaws including a plurality of grooves, wherein each of the grooves is configured to be selectively alignable with a grooved spacing of a drill stem component to form an aligned opening; a key insertable within the aligned opening formed by the selected groove of the at least one of the wrench jaws and the grooved spacing of the drill stem component to select a relative starting orientation between the first and second lever arms and to transfer torque between the at least one of the wrench jaws and the drill stem component; wherein the second lever arm is movable with respect to the first lever arm about an axis of rotation; an actuator to move the first lever arm with respect to the second lever arm about the axis of rotation, the actuator providing a mechanical advantage.