Patent ID: 7278478

Claim:
An anchoring tool in combination with a well casing for anchoring a tubing string within the well casing, the anchoring tool comprising: a tubular housing arranged for connection in line with the tubing string; a fixed jaw mounted on the tubular housing in fixed relation to the tubular housing and arranged for rotation with the tubular housing in relation to the surrounding well casing; and a floating jaw supported for full rotation about the tubular housing in relation to the fixed jaw and arranged for engaging the well casing to vary an overall diameter of the tool as the fixed jaw is displaced relative to the floating jaws; the overall diameter of the tool being arranged to be greater than a diameter of the well casing when the fixed jaw and the floating jaw are diametrically opposite one another; the floating jaw being rotatable away from the fixed jaw from an unset position to a set position in which the floating jaw and the fixed jaw are farther apart from one another in the set position than in the unset position and in which the overall diameter of the tool is increased in the set position relative to the unset position; and the tubular housing being arranged to engage the well casing opposite the fixed jaw and the floating jaw engaging the well casing in the set position.