Patent ID: 6892811

Claim:
An anchoring tool for preventing rotation of a tubing string relative to a surrounding well casing, the anchoring tool comprising: a tubular housing for connection in line with the tubing string; and a gripping member supported on the housing for rotation about an anchor axis lying substantially parallel to a longitudinal direction of the housing; the gripping member having a profile which increases in radial dimension from a first gripping portion to a second gripping portion; the first gripping portion being arranged to grip the surrounding well casing in a retracted position of the gripping member; the gripping member being rotatable relative to the tubular housing from the retracted position in a first direction towards a first extended position and from the retracted position in a second direction towards a second extended position in which the second gripping portion is arranged to grip the surrounding well casing in both the first and the second extended positions; whereby rotation of the housing with the tubing string relative to the well casing rotates the gripping member in relation to the housing to vary an overall diameter of the anchoring tool within the well casing.