Programme details

Over many years Statoil has focussed on increasing hydrocarbon recovery factors from their reservoirs. The company has a stated ambition for achieving an average 55% recovery factor from subsea wells. Considering that the majority of the company’s oil production originates from subsea wells, it is clear that this is a major strategic area for development. Continuous technology development has been is delivering more safe, efficient and cost effective well intervention operations in subsea wells. During 2009 new technology has been taken into use for the first time, this consists of a fit-for-purpose LRP (Lower Riser Package), high pressure riser and near-surface BOP system operating from the Stena Don semi-submersible unit. This unique system enables, for the first time, coiled tubing and TTRD (Through Tubing Rotary Drilling) operations on subsea wells with the same riser and well control system.

The presentation will review some history relating to increasing reserves recovery from subsea wells. Activities from light to medium well intervention operations will be discussed with a focus on the technical and operational experiences. A review of the 2009 activities will be provided – with several coiled tubing and TTRD operations with Stena Don. The presentation will also provide a look ahead to further plans for improvement and optimisation in this area.