Casing and liner drilling bits

Details Casing and liner drilling bits Casing and liner drilling bits

2008-07-08

2008-07-08

Bomar, Shane (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Casing shoe type

C175S425000, C175S171000, C166S242800

Reexamination Certificate

active

10783720

ABSTRACT:
A casing bit, which may comprise a composite structure, for drilling a casing section into a subterranean formation, and which may include a portion configured to be drilled therethrough, is disclosed. Cutting elements and methods of use are disclosed. Adhesive, solder, electrically disbonding material, and braze affixation of a cutting element are disclosed. Differing abrasive material amount, characteristics, and size of cutting elements are disclosed. Telescoping casing sections and bits are disclosed. Aspects and embodiments are disclosed including: at least one gage section extending from the nose portion, at least one rotationally trailing groove formed in at least one of the plurality of blades, a movable blade, a leading face comprising superabrasive material, at least one of a drilling fluid nozzle and a sleeve, grooves for preferential failure, at least one rolling cone affixed to the nose portion, at least one sensor, discrete cutting element retention structures, and percussion inserts.

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