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US 8,282,316 B2Granted
Method and assembly for installing oilfield equipment at the water bottom
AssigneeShell Oil Company
InventorHarald Wahl Breivik
Life of this patent
Estimating the term…
Abstract
Subsea oilfield equipment (2), such as an oil and/or gas production template, is installed at the water bottom (16) by means of a submerged installation vessel (1) from which hoisting lines (3A, 3B) are deployed to support the equipment during the installation procedure, which lines (3A,3B) are reeled from at least one hoisting line reeling winch (3A,3B) mounted at the submerged installation vessel (1) to lower the equipment (2) at a desired speed and in a substantially horizontal position onto the water bottom (16).
Claims8
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.
Dependencies are inferred from the claim text.