Casing bif for harder rock makes drill-out easier

摘要

Non-retrievable drilling-with-casing (DwC) systems are being used in harder formations and over longer intervals with much less drill-out, milling, and cleanout based on recent developments in drillable bit technology. The enhanced performance is achieved with a new bit series that uses PDC cutting elements mounted on aluminum nose and blade supports. The design provides a premium cutting structure comparable with conventional PDC bits while reducing steel in the drill path by 80%.