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Managed Pressure Drilling Calls for New Certification Requirements

For many operators, managed pressure drilling (MPD) techniques have been proven cost-effective, reliable, and to enhance safety when drilling difficult onshore wells as when drilling from mobile offshore drilling units with a surface BOP. As operators have begun to view MPD as an enabling method in drilling increasingly complex and previously “un-drillable” offshore wells, ABS is finalizing requirements that specify certification for MPD systems.

The primary function of any MPD system is to contain wellbore pressures in a controlled flow system within the well’s pressure-design “envelope,” while providing both a means of adding fluids to the wellbore and allowing controlled volumes to be removed from wellbore.

Because the overall MPD system and all of its subsystems will be considered a part of the primary well pressure barrier system, for any ABS-classed rigs, all associated components used in MPD operations will require ABS design approval and an ABS survey for installation. The new ABS requirements will be published in 2015 as an appendix to the ABS Guide for Classification of Drilling Systems (CDS Guide). 

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