Concentric riser will reduce mud weight margins, improve gas-handling safety

John M. ShaughnessyAmoco Corp. Houston Robert P. HerrmannConsultant Houston A high-pressure concentric riser, consisting of a surface casing string run within the riser, will have the potential to use a dual-density mud system to reduce mud weight margins, allowing operators to set fewer casing strings in deepwater environments. An additional benefit includes improved gas-handling safety above the seafloor. In comparison with the concentric riser system, conventional marine risers are not designed to contain pressure; instead, the serve primarily as a conduit between the seafloor blowout preventer (BOP) and the rig floor. Issues with well control, gas handling, and well testi...

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