Utilizing Data Acquisition from Well Interventions to Understand Completion Performance and Water Shut-Off Results at the Ivar Aasen Field

Abstract On the Ivar Aasen field, data acquisition in production wells by means of intervention is important to gain knowledge of the reservoir, well performance and fluids distribution from the reservoir into the lower completion. The Ivar Aasen field has complex geology with varying reservoir quality and multiple faults. Field pressure is maintained by injecting a mix of seawater and produced water. Zonal control and the ability to shut-off water has become more important in recent years, especially after oil production fell off plateau. The production well completion strategy is stand-alone screens, ICD's and swell packers for zonal isolation. Sliding sleeve doors (SSD) in conjunction with screens for zonal control is a completion solution that was installed in 3 infill wells in the most recent drilling campaign. Recent data acquired in oil producers have provided information valuable to the understanding of well and completion performance. This paper shows how data gathered from well interventions, combined with analytical methods, can propose changes to existing completion design to enhance oil production from new and existing wells. The paper presents and discusses results from various logging methods, such as production (PLT) and pulsed neutron (PNL). In addition, it presents learnings from recent water shut-off operations. The paper demonstrates how data analyses and interpretation integrate to substantiate annular restrictions and complete annular blockage outside the lower completion. The implications may have significant impact on the design of new wells. Data analyses suggest improving existing completion design. In wells with zone control, increasing the number of SSD screens to minimize negative effect of annular blockage is one example. Also, a connected screen solution is being evaluated for use in future IOR campaigns. In addition, the experience with naturally forming annular flow barriers has opened for unconventional approaches for water shut-off operations in existing wells by means of installing plugs or straddles.