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New completion technique optimizes multiple zone frac treatment

A big step toward optimum treatment of multiple zones was made recently in a new technique developed by Lone Star Producing Co.'s E. Texas District, Halliburton Services, and Otis Engineering Corp. The novel approach involves isolating and breaking down each zone prior to limited entry fracturing in one continuous pumping operation down the casing. Complete pressure control is maintained at all times eliminating any need to kill the well. Although the new method evolved from problems peculiar to some formations found in E. Texas, its application opens the way to improving productivity in other formations with similar characteristics. Wells completed in the Travis Peak Sandstone involved up to 14 potentially gas-producing zones spanning an interval as much as 1,500 ft. In the case history described, it was not economically feasible to isolate and treat each zone by retrievable packers on the tubing. Equally important, response to exposure to kill fluids used in this procedure usually resulted in disappointing results. The completion technique is described in detail.