Boring or penetrating the earth – Processes
Patent
1995-02-09
1995-12-05
Schoeppel, Roger J.
Boring or penetrating the earth
Processes
175101, 175107, 175171, 175259, 175267, E21B 700
Patent
active
054720575
ABSTRACT:
A wellbore is formed in the earth with an elongated, non-rotating tubular drillstem which may consist of a well casing or liner and including an expendable sub and reamer bit part connected to the lower distal end of the drillstem. A retrievable drilling fluid operated motor and drive member assembly are disposed in the drillstem. The motor and drive member include pressure fluid responsive mechanism for engagement with and disengagement from the reamer bit part to rotatably drive the reamer bit part and a central bit part connected to the drive member without rotating the casing type drillstem. The motor, drive member and central bit part may be retracted from the drillstem upon completion of drilling operations without retrieving the expendable reamer bit part.
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Atlantic Richfield Company
Martin Michael E.
Schoeppel Roger J.
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