Self sharpening cutting structure for expandable earth...

Details Self sharpening cutting structure for expandable earth... Self sharpening cutting structure for expandable earth...

E - Fixed Constructions

21

B

E21B 10/32 (2006.01) E21B 7/28 (2006.01) E21B 10/46 (2006.01)

Patent

CA 2640823

A tool for enlarging a borehole that includes an elongated tubular body; at least one movable arm affixed to the tubular body, the at least one movable arm comprising an outer surface formed of at least one of a matrix material and an abrasive material; and at least one actuating member for expanding at least one movable arm from the collapsed state to an expanded state is disclosed.

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