The Statfjord Field has produced about 635 million Sm3 (four billion bbl) of oil and exported 68 billion Sm3 of gas since the production start in 1979. Currently, the field is in its tale production, producing at an oil rate of approximately 20,000 Sm3/d, which is about 17 per cent of plateau production rate. Improved recovery and thereby extended production life of the Statfjord Field is now to be obtained by changing the drainage strategy from pressure maintenance to depressurisation. About three million working hours are planned for in connection with the upgrades required to extend the lifetime of the Statfjord Field by approximately 10 years. The production will continue and be optimised during the upgrading and changed drainage strategy.
Real time data transfer from offshore to land enables support of drilling, well intervention and production operations in an efficient manner. New work processes were required in order to facilitate remote support as well as quality control of production logging, measurement while drilling, drilling parameters, geology structures, well completion, process adjustments and production optimisation. In addition, onshore engineering support results in a much better utilisation of engineering resources. Visualisation in onshore/offshore meetings (twice a day) has enhanced a common understanding and made the work process integrated. Careful planning of adjusted work processes and making an energising involved personnel were the most important issues in order to achieve results and drive the changes.
The results so far are successful and the conclusion is a continuation of the project and an expansion of the involved professional disciplines to gain increased quality and time efficiency of the offshore operations.