Earth boring drill bits with casing component drill out capability, cutting elements for same, and methods of use

摘要

A drill bit (12) includes a bit body having a face on which two different types of cutting elements are disposed, the first type (32) being cutting elements suitable for drilling at least one subterranean formation and the second type (36) being cutting elements suitable for drilling through a casing bit disposed at an end of a casing or liner string and cementing equipment or other components, if such are disposed within the casing or liner string, as well as cement inside as well as exterior to the casing or liner string. The second type of cutting elements (36) exhibits a relatively greater exposure than the first type of cutting elements (32), so as to engage the interior of the casing bit and, if present, cementing equipment components and cement to drill therethrough, after which the second type of cutting elements (36) quickly wears upon engagement with the subterranean formation material exterior to the casing bit, and the first type of cutting elements (32) continues to drill the subterranean formation. The second type of cutting elements (36) includes a cutting face with at least one of scallops (SC) and teeth (T).