API RP 92P

Description

This document addresses recommended practices for pressurized mud cap drilling (PMCD) from a floating rig with a subsea BOP stack. When massive lost circulation conditions are encountered one of the following drilling methods may be implemented to allow well construction operations to continue: a) blind drilling; b) continuous annular injection drilling; c) floating mud cap drilling; d) pressurized mud cap drilling (PMCD). Although this document only addresses PMCD, most of the equipment described may also be used for the surface back-pressure (SBP) method of managed pressure drilling. However, much of the equipment used for SBP is not required for PMCD and is beyond the scope of this document.