Abstract

Virden and Daly are giant fields with mature waterfloods that have received minimal development attention since the waterfloods were initiated more than 30 years ago. An evaluation of the wells' production symptoms suggested that many areas within the fields were not optimized. Some areas display long, harmonic production declines with large remaining reserves. Other areas display injected water cycling through layers of high permeability while still other areas display a strong bottom-water drive that resulted in water coning. This paper describes a low-cost. short cycle-time method in which these fields were modeled and tested. A development pilot project was initiated to determine the economic viability of optimizing these fields. A conscious decision was made to accept a higher risk, but save time and money by designing a development pilot program directly from a conceptual. Streamtube displacement reservoir simulation. The 1996 pilot program consisted of 6 horizontal wells and 3 producer to injector conversions in areas of slow waterflood response, and in areas of water-cycling 3 polymer workovers on injectors were done to redirect water. Results suggested that the pilot program was an economic success. resulting in an expanded program for 1997 (9 horizontal wells, 5 conversions, and 1 polymer workover).

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