This paper details the technical and economic challenges in west Africa that have led to the design of drillpipe-riser-intervention-system (DPRIS) solutions. Depending upon the field requirements, two different types of drillpipe-riser systems using a proprietary double-shoulder connection have been used by operators. A first solution was developed in 1999 featuring a seal ring close to the external shoulder. Subsequently, a new solution featuring a gas-tight metal-to-metal seal on the pin nose was developed.
Introduction
Well-completion and -intervention operations in offshore environments are growing in complexity because of increasing water depths and working-pressure requirements.
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