Stabilizer and rotary expansible drill bit apparatus

Details Stabilizer and rotary expansible drill bit apparatus Stabilizer and rotary expansible drill bit apparatus

1976-07-08

1978-03-28

Purser, Ernest R.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

175325, E21B 926

Patent

active

040810429

ABSTRACT:
The upper end of a rotary drill bit having initially retracted expansible cutters is connected to a stabilizer having initially retracted expansible stabilizer members, the upper end of the stabilizer being connectable to a rotary drill pipe string. The apparatus is lowered in a bore hole on the drilling string and rotated, the cutters being expanded to cut into the bore hole and enlarge it to a desired diameter, the apparatus being lowered to progressively continue enlarging the hole in a downward direction. Upon the stabilizer moving into the enlarged hole, its stabilizer members are expanded laterally to an extent conforming to the enlarged hole diameter, being engageable with the wall of the bore hole to stabilize the bit therebelow.

REFERENCES:
patent: 2699921 (1955-01-01), Garrison
patent: 3123162 (1964-03-01), Rowley
patent: 3196960 (1965-07-01), Kammerer
patent: 3370657 (1968-02-01), Antle
patent: 3443648 (1969-05-01), Howard
patent: 3938598 (1976-02-01), Watts

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