Coiled Tubing Inverted Gas-Lift System Installation on the Norwegian Continental Shelf

摘要

The Statfjord field was the first, and one of the largest, fields developed so far with Statoil as operator. The field was discovered by Mobil in 1974 and Statoil took over operatorship in 1987. The field was developed with Statfjord A, B and C production platforms, which all have concrete gravity base structures incorporating storage cells. Statfjord A began production in 1979. The field will remain in production until 2025 and possibilities to further expand the lifetime are being looked into. One of the techniques that are being applied to rejuvenate some of the older wells is retrofit gas lift solutions. In this paper detailed information on an Inverted Gas Lift System (IGLS) applied to a well on the Statfjord A platform will be presented. The IGLS solution included a solution to retain downhole safety valve functionality in the well and required qualification of a new type of coiled tubing material.