Multi-zone, multi-sensor intelligent WAG injector ///

In May 2004, Statoil installed a Water Alternating Gas (WAG) injector in well 30/3 A-11 B on the Veslefrikk platform in the Norwegian North Sea, Fig. 1. The intelligent completion covers four formations: Ness 2, Etive, Oseberg 2, and the Intra Dunlin Sands (IDS). It includes two 3-1/2-in. and one 4-1/2-in. optical, single-phase, flowmeters set at 2,561, 3,138, and 3,340 m. To control the zones’ injection rates, the completion uses three variable downhole inflow control valves (ICV) and one on/off valve. The well’s injection rates reached 40,000 bpd of water and 60 MMcfpd of gas during maximum injection. The optical monitoring equipment and valves are functioning well after nearly two years of water and gas injection. For Statoil, the equipment combination allows reservoir pressure management and production optimization by monitoring and controlling injection rates for each zone. The company estimates that the Downhole Instrumentation and Control System (DIACS) will account for half of the well’s value creation over the well’s life.

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