This paper is a case history of the Frontier Formation hydraulic fracture stimulations applied since 1984 in the Fontenelle Field located in Sweetwater County, Wyoming. The hydraulic fracture treatments have undergone several design changes that have led to a 25% increase in production and a 66% decrease in completion costs.

Design changes that have been incorporated to reduce costs include reduction in pad volumes, use of sand versus intermediate strength proppant, reduced pump rates, and the use of water based gels instead of CO2 foams. Improved production is attributed to improved fracture geometry resulting from 3-D fracture model analysis.

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