Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2005-11-15
2005-11-15
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S062000
Reexamination Certificate
active
06964308
ABSTRACT:
In accordance with one embodiment of the present invention, a method for drilling a lateral wellbore from a slant well includes drilling the slant well below the surface of the earth such that the slant well is angled toward a first horizontal direction that coincides with a desired drilling direction for the lateral wellbore. The slant well has a borehole wall that includes a high side portion closest to the surface, a low side portion farthest from the surface, and two side portions between the high side portion and the low side portion. The method further includes disposing a casing string in the slant well, disposing a drill string having a bent sub, a mud motor, and a drill bit coupled at a lower end thereof in the casing string, and positioning the drill bit adjacent either one of the side portions or the low side portion. The method further includes drilling, from either the side portion or the low side portion, an intermediate wellbore with the drill bit, and drilling, from the intermediate wellbore, the lateral wellbore in the desired drilling direction.
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Bagnell David
CDX Gas, LLC
Fish & Richardson P.C.
Smith Matthew J.
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