Patent ID: 8006785

Claim:
A casing bit reamer for drilling a casing section into a subterranean formation by enlarging a borehole, comprising: a pilot section having an inner profile, an outer profile, and a nose portion, the pilot section having a first cutting structure thereon; wherein the first cutting structure comprises: a plurality of generally radially extending blades disposed on the nose portion, wherein at least one of the plurality of blades carries one or more cutting elements; and at least one gage section, the at least one gage section defining a pilot gage diameter; a reamer section longitudinally adjacent the pilot section comprising a tubular body including a second cutting structure thereon; wherein the second cutting structure comprises: a plurality of generally radially extending blades disposed on the tubular body, wherein at least one of the plurality of blades of the second cutting structure carries one or more cutting elements; and at least one gage section, the at least one gage section of the second cutting structure extending longitudinally from the reamer section and defining a reaming diameter that is larger than the pilot gage diameter; and a connection structure configured for connecting the casing bit reamer to a casing section configured to line a wellbore.