Improved Reservoir Management With Intelligent Multizone Water-Alternating-Gas (WAG) Injectors and Downhole Optical Flow Monitoring
| Autor: | Bernt Sandoy, Gisle Vold, David Tudor Barton, Gunnar H. Daae, Tore Tjomsland, Espen S. Johansen |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | SPE Production & Operations. 22:176-189 |
| ISSN: | 1930-1863 1930-1855 |
| DOI: | 10.2118/95843-pa |
| Popis: | Summary A four-zone intelligent water-alternating-gas (WAG) injector was installed at the Statoil Veslefrikk Field in the North Sea in May 2004. The completion includes one on/off and three variable downhole chokes for controlling injection rate into each of the four zones. The completion also includes three downhole optical flow-meters and three optical pressure and temperature gauges. Measurement of surface injection rate and the rate from each of the three flowmeters provides real-time measurement of injection rate into each zone, regardless of choke positions. The well is on a WAG cycle in which one zone is primarily intended for gas injection and the other three zones are primarily intended for water injection. Therefore, equipment that can control and measure water flow and gas flow with no changes in hardware was critical for the success of this installation. The combination of downhole chokes and flowmeters allows full control and monitoring of zonal injection rates and has proved to be a valuable tool for managing reservoir pressures and optimizing production. After more than 1 year of operation during water injection, all the valves and the optical monitoring equipment are functioning satisfactorily. It is estimated that up to half of the well's value creation during its expected lifetime is because of the DIACS (Downhole Instrumentation and Control System) installation. |
| Databáze: | OpenAIRE |
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