Boring or penetrating the earth – Processes
Patent
1993-12-21
1995-04-04
Dang, Hoang C.
Boring or penetrating the earth
Processes
175263, 175269, 175399, 175406, 175408, E21B 728, E21B 1032
Patent
active
054028566
ABSTRACT:
An anti-whirl underreamer comprising a body configured for connection to a drillstring, at least two arms carried by the body which are extendable between a retracted position and a projected position, a movable piston and biased spring assembly for moving the arms, a plurality of cutting elements carried by one of the arms for cutting an axially extending cylindrical sidewall of the borehole within a subterranean formation and for applying a resultant radial force to the body as it rotates, and a low friction bearing region carried by another arm for transmitting the resultant radial force from the body to the sidewall of the borehole during rotation of the underreamer within the borehole. The cutting elements are positioned so that the resultant radial force developed is of sufficient magnitude and direction to substantially maintain the low friction bearing region in contact with the sidewall of the borehole as the underreamer is rotated within the borehole.
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Sinor Lawrence A.
Warren Tommy M.
Amoco Corporation
Dang Hoang C.
Kretchmer Richard A.
Wakefield Charles P.
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