Petroleum Technology Digest: Low-cost, brine-activated polymer gel improves waterflood sweep ///

At little extra burden to its field staff, a Texas independent implemented a polymer gel process to improve a small waterflood’s sweep. Oil output quickly doubled before stabilizing at a slow decline. Conservatively, the revenue-to-cost ratio is 5.0. A four-well waterflood in Cook County, Texas, produces from a 1,100-ft Strawn Sand zone. This Strawn Sand is a channel sand. The injection well and producer #1 are in the main channel (Fig. 1), with more than 20 ft of sand. Producers # 2 and #3 are on the edge of the channel, with only a few feet of sand. They did not contribute much production or total fluid, either before or during this project. In 2004, before the project began, oil production and oil cut were gradually falling, averaging 210-220 bbls of oil per month (bopm) and about 6% oil cut when the project was started in January 2005.

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