SUBSEA LANDING STRING ASSEMBLY

摘要

An improved landing string comprising a bypass conduit arranged to provide fluid communication between a first pressurised chamber defined between two landing string valves and a second chamber located below a BOP pipe ram. The landing string may further comprise a centraliser for reducing a gap between the landing string and a marine riser to thereby extend the fatigue lifetime of the landing string. The landing string may further comprise a valve actuation apparatus comprising a pressure generating material for operating a landing string valve such as a SSTT valve. The landing string may further compromise an explosively parting joint and/or an explosive cutter apparatus.