Use of a higher pressure rated riser run inside the marine drilling riser would provide floating rigs with some advantages enjoyed by fixed rigs; the potential to drill underbalanced or near balanced, improved gas handling capability, improved well testing capability, expanded kick control capabilities and increased mud weight rating. Drillers have found areas in ultra-deepwater where the fracture gradient is close to the pore pressure within a few thousand feet of the seafloor. These wells can not be drilled with conventional equipment. Underbalanced or near balanced drilling which has been successfully used onshore may be the only method to drill such formations. The concentric riser would make it possible. The time and equipment required to test a deepwater well would be significantly reduced if a conventional surface type hook up could be used. However, few rigs will be able to run a concentric riser. The latest generation of drillships, such as the Discoverer Enterprise, will have the capability and equipment to do so. The paper will address the advantages, the operational procedures and hardware needed to utilize a concentric riser safely.
Concentric drilling risers for ultra deepwater
1998
11 Seiten, 6 Quellen
Conference paper
English
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