HYBRID ROLLER CONE AND JUNK MILL BIT

摘要

A hybrid bit for use in a wellbore includes: a body having a shank forconnection to a drilling motor or drill pipe and a plurality of legs attachedto the shank;and a plurality of cutting structures. The cutting structures include a rollerconemounted to a first one of the legs and a fixed mill mounted to a second one ofthe legsand including a pad dressed with a cermet material.