Reservoir Polymer Gel Treatments To Improve Miscible CO2 Flood
| Autor: | G.P. Hild, R.K. Wackowski |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | SPE Reservoir Evaluation & Engineering. 2:196-204 |
| ISSN: | 1930-0212 1094-6470 |
| DOI: | 10.2118/56008-pa |
| Popis: | Summary This paper describes the application of large volume (10,000 bbl) chromic-acetate acrylamide polymer gel treatments to improve sweep in the miscible CO2 flood at Rangely Weber Sand Unit located in northwestern Colorado. Conformance improvement has become the key operating strategy due to the maturing flood's associated natural increase in operating expense and declining oil production. Recent efforts using large volume polymer gel treatments on injection wells have been successful. The key to success has been the pairing of accurate problem characterization with a technology that can effectively impact the deep reservoir problem. The gel system has been effective because it has proven to be resistant to the low pH environment associated with CO2 flooding and has been pumped in significant quantities to improve sweep. Previous application of relatively small volume, near-wellbore treatments were not effective at preventing flow in the high permeability matrix and fracture pathways believed to be responsible for poor sweep. Results from 44 injection well treatments performed through mid-1997 are discussed. Candidate selection, treatment logistics, individual treatment examples, and full project economics are provided. Field modeling and forecasting is discussed to show the significant impact of continued treatments on field performance. |
| Databáze: | OpenAIRE |
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