For well containment operations under tension leg or spar platforms, a connector is required to attach a capping stack to a free flowing riser in the event the wellhead connector cannot be accessed and/or released to directly attach the capping stack. This paper describes the engineering challenges and solutions for capping stack connectors – high-pressure grip and seal connectors – to attach to 10 ¾"-15K and 16"-10K risers for the Shell Mars B Development in the Gulf of Mexico.

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