US Patent 8371387 Methods and apparatus for manipulating and driving casing
Patent 8371387 was granted and assigned to Baker Hughes on February, 2013 by the United States Patent and Trademark Office.
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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.
US Patent 08371387 Methods and apparatus for manipulating and driving casing US Patent 8371387 Methods and apparatus for manipulating and driving casing
US Patent 08371387 Methods and apparatus for manipulating and driving casing
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