The wireline servicing of subsea completed wells is expensive and time consuming, as even simple wireline work has always been carried out by semi-submersibles in the North Sea. This paper describes the development of a subsea wireline and surface support system which has been used on a test well in the Argyll Field by the mono-hull diving support vessel, the ‘British Argyll’. The design of the system has evolved over the last three years as a result of close co-operation between Hamilton Brothers, the DSV operator and a major wireline company. The use of such a vessel has the potential to save an oil producer several million dollars per year based on the historical frequency of wireline interventions in a subsea developed field.

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