Means and method of drilling wells

Details Means and method of drilling wells Means and method of drilling wells

1975-03-20

1976-06-29

Abbott, Frank L.

Boring or penetrating the earth

Processes

175171, 175260, E21B 926

Patent

active

039659968

ABSTRACT:
A means and method of drilling wells wherein the casing and tubing string are rotated with minimum interruption and are moved downwardly simultaneously. A bit assembly, capable of cutting a bore larger than the casing, is lowered and raised through the drill string, the bit assembly being pivotable between a position in which the transverse axis is in alignment with the drill string bore for movement therein and a drilling position in which its longitudinal axis is transverse to the axis of the drill string and surrounding casing and extends radially beyond the casing for drilling operation; the lower end of the drill string and bit assembly having interlocking parts to transmit rotational force from the drill string to the bit assembly.

REFERENCES:
patent: 1454984 (1923-05-01), Stewart
patent: 1819798 (1931-08-01), Stokes
patent: 1894039 (1933-01-01), Hill
patent: 2133564 (1938-10-01), Patton
patent: 2330083 (1943-09-01), Sewell
patent: 2641444 (1953-06-01), Moon
patent: 3164215 (1965-01-01), Johnson
patent: 3369618 (1968-02-01), Moore
patent: 3552509 (1971-01-01), Brown
patent: 3880247 (1975-04-01), Harding

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