Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Axially spaced opposed bore wall engaging guides
Patent
1997-10-31
2000-05-09
Dang, Hoang
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
Axially spaced opposed bore wall engaging guides
175269, 1753253, 175385, 175406, E21B 704, E21B 402, E21B 1032
Patent
active
060590513
ABSTRACT:
The present invention is an apparatus for use in drilling operations. It uses an under-reamer having a plurality of elongated arms with cutting elements at the ends of the arms for enlarging a previously drilled borehole drilled by a drill bit. One or more stabilizers in close proximity to the under-reamer provide stability to the under-reamer and the drill bit. The stabilizer could be rotating or non-rotating; and could be positioned between the under-reamer and the drill bit, or above the under reamer or above a directional device on the drillstring. The cutting arms are selectively operable to perform the enlargement. The stabilizer may be provided with members that closely fit the size of the borehole.
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Jewkes Donald
Krueger Volker
Baker Hughes Incorporated
Dang Hoang
LandOfFree
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