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BP operates three oilfields in the West of Shetland (WOS) fields of the northeast Atlantic. To date, any well intervention work has been undertaken by semisubmersibles. However, the WOS fields require better access to intervention capability, so BP has embarked on a plan to improve Light Well Intervention (LWI) access. Although LWI had not been attempted in the WOS, experiences elsewhere on the UK Continental Shelf and Norwegian Continental Shelf indicated that LWI was feasible and attractive for the harsh environment of the WOS. This article explains the process that BP underwent to identify and quantify value-adding intervention options, and explains some of the technical challenges that must be addressed to execute a subsea LWI campaign. Other intervention technologies being developed to address the global subsea well stock are also discussed.
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