Worldwide, there are more than 3,000 subsea wells, and the number is growing. To increase recovery from these wells, there is a demand for an efficient subsea light well intervention service, including repair, scale removal, installation and manipulation of mechanical devices (valves, plugs, screens, etc.), perforations and re-perforations, zone isolation, fluid sampling, PLT, chemical treatment, well abandonment, etc. Traditionally, this type of work has been done by drilling rigs. Light well intervention technology makes this type of service possible from a monohull vessel. The technology reduces the intervention cost to "3, enabling more intervention work and resulting in better exploitation of subsea wells. The long-term objective is to increase recovery on subsea wells from an average 45 percent to 55 percent. An alliance of a vessel owner, a wireline operator and a well control company offers a complete RLWI service. The alliance has performed RLWI services on the Norwegian sector since spring 2006 and made interventions on more than 20 wells, after succeeding to laad a long-term contract. Continuous operations have resulted in ongoing improvement of systems and operation and provided important contributions to design and construction of new RLWI vessels and systems.
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