Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent
1992-10-14
1993-12-21
Britts, Ramon S.
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
175267, E21B 400
Patent
active
052714721
ABSTRACT:
Wellbores are formed in the earth with elongated, tubular drillstems which include retrievable bit 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 bit 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: 3603412 (1971-09-01), Kammerer
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
patent: 5064006 (1991-11-01), Waters et al.
Atlantic Richfield Company
Britts Ramon S.
Martin Michael E.
Schoeppel Roger J.
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