Reservoir quality and response to stimulation vary significantly in the Frontier Formation. Available geological and engineering data have been integrated with a core study to better understand Frontier reservoir properties and stimulation response.

Second Frontier reservoir quality is best developed in marine upper shoreface/bar and fluvial channel depositional systems. Lower shoreface sandstones are generally non-reservoir-quality material. Flow study results support the use of crosslinked gelled-water frac fluids from pH 4.0 to pH 10.5. The major potential completion problem identified in the Frontier is fines migration of mixed-layer illite/smectite clay. Analysis of production and stimulation data from the Church Buttes/Bruff area indicates that foam fracs may yield higher initial flow rates, but crosslinked gelled-water treatments result in higher ultimate recoveries.

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