Directional Casing while Drilling eases path through Nahr Umr shale off Qatar

摘要

Threaded Casing Drive fTCD). Addressing the different aspects of well control while implementing DCwD, a special device was developed for use while tripping the BHA with drillpipe. To retrieve the BHA involved tripping in with a work string, engaging the top of the BHA and tripping out of the hole with it While this operation is going on, the casing is caught and sealed by casing rams occupying the upper slot of the BOP A false rotary table is created atop the casing string just above the drill floor.