Mandrel operated torque anchor

In a mandrel-operated tension torque anchor for insertion into the casing of a well to anchor the pipe string from rotation and vertical movement, the anchor comprising a tubular anchor frame including a drag block means, a plurality of slips having upper and lower feet mounted within a slip cage secured to the frame, each of said slips actuable by pairs of cones associated with the frame and movable longitudinally relative thereto into anchoring position under the feet of the slips to force the feet outwardly into anchoring position engaging walls of the casing, so as to prevent rotary and vertical movement of the anchor frame in the casing, actuation means to cause the cones and slips to move relatively together into that anchoring position, and an emergency release assembly for disassociating the anchor from the casing on tension being applied to the mandrel;

• the improvement characterized in that the actuation means comprises drive means operatively secured to the mandrel so as to rotate therewith and isolate the emergency release assembly from the setting force applied to the slips, the drive means threadably secured to the frame so as to cause movement of the cones into anchoring position upon rotation of the mandrel in one direction.