Boring or penetrating the earth – Processes
Patent
1991-08-14
1993-03-30
Britts, Ramon S.
Boring or penetrating the earth
Processes
175107, 175171, 175259, 175267, E21B 700
Patent
active
051975530
ABSTRACT:
Wellbores are formed in the earth with elongated, tubular drillstems which include retrievable bit and drive motor assemblies. The retrievable bit assembly includes a body having locking dogs engageable with cooperating recesses formed in a sub at the bottom of the drillstem. The bit assembly includes radially extendable and retractable arms with cutters thereon for forming the wellbore to a diameter greater than the drillstem, but whereby the arms may be retracted to withdraw the bit assembly through the drillstem with wireline retrieval apparatus or the like. The wellbore may be drilled with a tubular drillstem comprising wellbore casing with a retrievable bit and motor assembly connected to the lower end of the drillstem and retrievable through the drillstem by the wireline retrieval apparatus whereby the casing may be left in the wellbore upon completion of drilling operations.
REFERENCES:
patent: 1833134 (1931-11-01), Stokes
patent: 3249162 (1966-05-01), Brown
patent: 3603412 (1971-09-01), Kammerer et al.
patent: 4153121 (1979-05-01), Allan
patent: 4470470 (1984-09-01), Takano
patent: 4550392 (1985-10-01), Mumby
patent: 4616719 (1986-10-01), Dismukes
patent: 4646856 (1987-03-01), Dismukes
patent: 4651837 (1987-03-01), Mayfield
Atlantic Richfield Company
Britts Ramon S.
Martin Michael E.
Schoeppel Roger J.
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