Steep angle raise bit

Details Steep angle raise bit Steep angle raise bit

E - Fixed Constructions

21

B

255/75

E21B 10/00 (2006.01) E21B 7/28 (2006.01) E21B 10/28 (2006.01)

Patent

CA 1107715

STEEP ANGLE RAISE BIT Abstract of the Disclosure A raise bit for enlarging a pilot hole into a larger diameter hole by disintegrating the earth formations that surround the pilot hole is provided with a cutter arrangement that provides a continuous angle bottom configura- tion in the range of 134° to 60°.

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