IADC/SPE Drilling Conference 1998
DOI: 10.2118/39297-ms
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Concentric Drilling Risers for Ultra Deepwater

Abstract: 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 cannot be drilled w… Show more

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