Abstract
Summary The introduction of water-base fracturing fluids to water-sensitive formations can be detrimental to well performance. Gelled oil fracturing fluids are often used in water-sensitive formations. However, temperature limitations have typically been associated with gelled oil fluids, especially those used in continuous-mix applications. The chemistry and field application of an improved continuous-mix gelled oil system for use at reservoir temperatures between 75 and 300°F are described. A brief history of oil gelation and phosphate ester chemistry is presented, followed by a discussion of new complexation chemistry. Laboratory data supporting fluid performance are provided. A treatment evaluation is presented on 90 wells fractured in the Wyoming North La Barge area, from August 1994 to October 1996. Gelled oil fracturing treatments performed with prior art chemistry (PAC) are compared to those performed with an enhanced complexation chemistry (ECC).
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