The chemistry and field application of a continuous-mix gelled oil fluid are described. A brief history of oil gelation and phosphate ester chemistry is presented, followed by a discussion of new complexation chemistry. Field case studies are presented on 90 wells fractured in the Wyoming North La Barge field, from Aug. 1994 to Oct. 1996. Gelled oil fracturing treatments performed using prior art chemistry are compared to those performed using an enhanced complexation chemistry.

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