US Patent 7493971 Concentric expandable reamer and method
Patent 7493971 was granted and assigned to Smith International on February, 2009 by the United States Patent and Trademark Office.
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An expandable downhole tool comprises a tubular body, at least one moveable arm disposed within the tubular body and being radially translatable between a retracted position and a wellbore engaging position, and at least one piston operable to mechanically support the at least one moveable arm in the wellbore engaging position when an opposing force is exerted. A method of reaming a formation to form an enlarged borehole in a wellbore comprising disposing an expandable reamer in a retracted position in the wellbore, expanding at least one movable arm of the expandable reamer radially outwardly into engagement with the formation, reaming the formation with the at least one moveable arm to form the enlarged borehole; and mechanically supporting the at least one moveable arm in the radially outward direction during reaming.
US Patent 07493971 Concentric expandable reamer and method US Patent 7493971 Concentric expandable reamer and method
US Patent 07493971 Concentric expandable reamer and method
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