Drilling with casing

Details Drilling with casing Drilling with casing

2005-04-12

2005-04-12

Thompson, Kenn (Department: 3672)

Boring or penetrating the earth

Boring without earth removal

Drive point detached from shaft to form cased bore or with...

C175S073000, C175S171000

Reexamination Certificate

active

06877570

ABSTRACT:
A borehole may be drilled utilizing the bottom hole assembly10, 50with a downhole motor14, which may offset at a selected bend angle. The motor housing is preferably run slick, and a gauge section36secured to the pilot bit18has a uniform diameter bearing surface along an axial length of at least 60% of the pilot bit diameter. The bit or reamer16has a bit face defining the cutting diameter of the drilled hole. The axial spacing between the bend and the bit face is controlled to less than fifteen times the bit diameter. The downhole motor, pilot bit and bit may be retrieved from the well while leaving the casing string in the well.

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