Expandable raise bit

Details Expandable raise bit Expandable raise bit

E - Fixed Constructions

21

B

255/76

E21B 10/00 (2006.01) E21B 10/20 (2006.01) E21B 10/28 (2006.01)

Patent

CA 1044693

EXPANDABLE RAISE BIT Abstract of the Disclosure A bit is provided that includes a bit body defining a bit axis of rotation. Primary cutter means are positioned on the bit body for disintegrating the formations out to a first radial distance from said bit axis of rotation. Secondary cutter means are adapted to be connected to the bit body and selectively located in a first position for cutting between said first radial distance and a larger second radial distance and selectively located in a subsequent position between said first radial distance and an even larger subsequent radial distance. Expan- sion means are provided to be located between said secondary cutter means and said bit body for locating said secondary cutter means in said subsequent position. -1a-

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