Wells – Expansible anchor or casing – Expansible means translated by wedge or cam
Reexamination Certificate
2005-05-17
2005-05-17
Thompson, Kenn (Department: 3672)
Wells
Expansible anchor or casing
Expansible means translated by wedge or cam
Reexamination Certificate
active
06892811
ABSTRACT:
An anchoring tool is provided for preventing rotation of a tubing string relative to a surrounding well casing in both right and left hand directions of rotation. The tool includes tubular housing for connection in line with the tubing string. A gripping member is supported alongside the housing for rotation about an anchor axis lying substantially parallel to the housing. The gripping member has a profile which increases in radial dimension from a first gripping portion to a second gripping portion thereof. The first gripping portion and the second gripping portion being arranged to grip the surrounding well casing in a retracted position and an extended position respectively. 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, thereby preventing further rotation. The gripping member is freely rotatable relative to the tubular housing in either direction of rotation from the retracted position to the extended position for anchoring in both directions of rotation of the housing.
REFERENCES:
patent: 3283405 (1966-11-01), Braswell
patent: 5623991 (1997-04-01), Jani
patent: 5636690 (1997-06-01), Garay
patent: 6041859 (2000-03-01), Blades
patent: 6073693 (2000-06-01), Aldridge
patent: 6318459 (2001-11-01), Wright et al.
Kobes Michael
LaClare G. Maurice
Battison Adrian O.
Dupuis Ryan W.
Thompson Kenn
Williams Michael R.
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