Methods and apparatus for manipulating and driving casing
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United States of America Patent
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Feb 12, 2013
Grant Date -
May 24, 2012
app pub date -
Jan 27, 2012
filing date -
Aug 27, 2009
priority date (Note) -
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Abstract
An apparatus and methods for manipulating and driving casing. The apparatus includes mechanically responsive elements for gripping an interior of a casing joint, and hydraulically responsive elements for gripping an interior of the casing joint responsive to pressure of drilling fluid flowing through the apparatus. One method comprises manipulating a casing joint by mechanically gripping an interior thereof, hydraulically gripping the interior of the casing joint responsive to drilling fluid pressure, and rotating the casing joint. Another method comprises driving casing by applying weight and torque thereto through engagement with an interior thereof.
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