Influences and Countermeasures of Internal Solitary Waves on Deepwater Drilling in the South China Sea

摘要

This paper provides a coupling dynamic method in which the combinedexcitation of vessel motion, uniform current, surface wave and internalsolitary wave are considered. Then, a case shows that internal solitarywaves largely increase envelopes of the deformation and stress of ariser system; and a new concept, “hysteresis effect”, adds the operationtime of emergency disconnection. At last, the paper proposes a detailedprocedure that dealing with platform positioning during differentinternal solitary wave spreading. In this procedure, normal operationtime and connected mode of a riser system can be maintained for moretime by early-warning and pre-deviate the platform.