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 a
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.