The Elk Sands in Clearfield and Cambria Counties of Southwestern Pennsylvania have been difficult to successfully fracture stimulate. Treatments successfully applied to the upper Devonian Sands resulted in screenouts andlittle productivity increase when applied to the Elks. This paper discussesvarious studies that have been conducted, including net pressure analysis and threedimensional modeling, to understand the fracturing behavior of these formations. Recommendations are made for improving future treatments of these formations.

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