Low cutter load raise head

Details Low cutter load raise head Low cutter load raise head

E - Fixed Constructions

21

B

255/72

E21B 10/28 (2006.01) E21B 7/28 (2006.01) E21B 10/12 (2006.01)

Patent

CA 1134807

LOW CUTTER LOAD RAISE HEAD Abstract of the Disclosure A raise head for enlarging a pilot hole into a larger diameter hole by disintegrating the earth formations that surround the pilot hole is provided that will require lower cutter loads to penetrate the formations being bored by directing the rock fracture planes toward the pilot hole. Directing the rock fracture planes toward the pilot hole forces the rock to yield with less input energy. The raise head includes a multiplicity of cutters for contacting and disintegrating the earth formations surrounding the pilot hole. The cutters are positioned on the raise head to provide an earth formation profile with a major portion of said earth formation profile extending outward and upward from said pilot hole. The angle between the major portion of the earth formation profile and the pilot hole is less than 90°.

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