Inventors:
Jack T. Oldham - Willis TX, US
L. Allen Sinor - Conroe TX, US
Eric E. McClain - Montgomery TX, US
Robert A. Laing - Montgomery TX, US
Evan C. Turner - The Woodlands TX, US
Mark W. Dykstra - Kingwood TX, US
Eric C. Sullivan - Houston TX, US
Assignee:
Baker Hughes Incorporated - Houston TX
International Classification:
E21B 17/14
E21B 10/46
E21B 7/20
US Classification:
175402, 175425, 175171, 1662428
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.