Polymer water shut-off treatments have been successful in the past for the purpose of increasing oil production and decreasing water production in problem wells. The results of applying a polymer water shutoff treatment to a well producing form the Phosphoria Formation in Hot Springs County, Wyoming, are presented in this paper. This water shut-off treatment represents an effective low-cost method for enhancing oil production in wells which have severe water production problems. The proper application of this technology can result in a significant amount of incremental oil production and a corresponding decrease in water production.

The specific well in this study was completed in the Phosphoria Formation with an initial producing rate of 216 barrels of oil per day. Within six months, the well was making 30 barrels of oil and 900 barrels of water daily. From this point, the oil production declined to 6 barrels per day after a period of two years and the water production remained nearly constant at 900 barrels per day.

A polymer water shut-off treatment, was performed on the well; after which, the oil production increased to 82 barrels per day and the water production decreased to 180 barrels per day. The expense of the treatment paid out in nearly two months, and after seven months the well was producing 13 barrels of oil and 200 barrels of water per day. The successful result of this treatment indicates the viability of polymer water shut-off treatments as low cost enhanced oil projects.

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