METHODS OF LOWERING AND RECOVERING LOADS IN SUBSEA OPERATIONS

A method of lowering a discrete load from a pipelay vessel comprises: holding a rigid rod on an upright launch axis where the rod extends through a hold-back system; coupling a lower end of the rod to the load; connecting a wire to the load directly; operating the hold-back system to advance the rod...

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Bibliographische Detailangaben
Hauptverfasser:	RODRIGUES FREIRE NETO, Irio, BOTELHO CHARNAUX SERTÃ, Bernardo
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ENGINEERING ELEMENTS AND UNITS EQUIPMENT FOR SHIPPING FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PERFORMING OPERATIONS PIPES RELATED EQUIPMENT SHIPS OR OTHER WATERBORNE VESSELS SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A method of lowering a discrete load from a pipelay vessel comprises: holding a rigid rod on an upright launch axis where the rod extends through a hold-back system; coupling a lower end of the rod to the load; connecting a wire to the load directly; operating the hold-back system to advance the rod downwardly, hence submerging the load, while the weight of the load is suspended from the hold-back system via the rod; when the load is underwater and beneath the splash zone, transferring the weight of the load from the hold-back system to the wire by detaching the load from the rod while the rod is held by the hold-back system; and continuing to lower the load in the water, suspended directly from the wire. The method may be reversed to recover a load from a subsea location, such as when lifting a wellhead or blowout preventer from the seabed.