Weatherford's drilling-with-casing (DwC™) system

Weatherford's drilling-with-casing (DwC™) system eliminates the need to trip pipe and bottomhole assemblies (BHAs), increasing drilling speed and reducing risk exposure by always having casing on or near the bottom. The DwC system simplifies well architecture by potentially reducing the surface casing size as well as contingency casing strings or liners. A casing string or liner can be eliminated by successfully drilling into or through a pressure transition or lost zone.