Patent ID: 8282316

Claim:
A method of installing oilfield equipment at a water bottom comprising: providing a first floating work vessel, providing a second floating work vessel, providing an installation vessel having a deck from which one or more hoisting lines are deployed to support the equipment, connecting the first floating work vessel to the installation vessel with one line, connecting the second floating work vessel to the installation vessel with one line, submerging the installation vessel and at least one of the one or more hoisting lines reeled from a hoisting line reeling winch mounted at the installation vessel, and installing the oilfield equipment wherein the line connecting the submerged installation vessel to the first floating work vessel is a J-shaped catenary chain and the line connecting the submerged installation vessel to the second floating work vessel is a towing cable to which a clump weight is connected, such that a lower section of the towing cable extends in a substantially horizontal direction between the clump weight and the submerged installation vessel.