Casing while Drilling (CwD) is a technique of drilling which has been proven to lessen many of the problems faced while drilling.

Casing while Drilling (CwD) is a technique of drilling which has been proven to lessen many of the problems faced while drilling. It has proven to be beneficial in controlling loss circulation and improving wellbore stability by ‘Plastering’ effect, high quality cement job and increased rig floor safety. Nizwa Energy used Casing Drive System (CDS) successfully to run CwD (Casing while Drilling) in their Oman operations