Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2006-03-21
2006-03-21
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S073000, C175S076000
Reexamination Certificate
active
07013994
ABSTRACT:
Directional drilling apparatus for use in drilling a deviated bore comprises a mandrel for mounting to a drill string and having a main axis. A non-rotating mass is rotatably mounted on the mandrel and has a center-of-gravity spaced from the mandrel axis. The apparatus further comprises an offsetting arrangement including a non-rotating offsetting portion rotatably mounted on the mandrel, coupled to the mass, and having an outer profile defining an offset relative to the mandrel axis, and a bearing portion rotatably mounted on the offsetting portion. In use, the apparatus is run into an inclined bore on a string, and the offsetting portion is oriented relative to the mass. When the string is rotated the mass tends towards an orientation with its center-of-gravity positioned towards the low side of the bore and thus tends to maintain the offsetting portion in a desired relative orientation in the bore, the bearing portion rotationally isolating the offsetting portion from the bore wall.
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Copy of International Search Report for PCT/GB02/00314 completed May 15, 2002.
Alston & Bird LLP
Andergauge Limited
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