The technology developed for massive hydraulic fracturing in tight gas reservoirs is applied to create short, highly conductive fractures in the oil productive Upper Clearfork formation of West Texas. The contents of this paper review operational aspects of design and factors influencing the successful execution of fracture treatments during an extensive infill drilling and waterflood expansion program in the Amoco operated Prentice Northeast Unit (PNEU). The PNEU is located in Terry and Yoakum counties of West Texas.

Long Spaced Digital Sonic Log Data (LSDS) was collected on several wells in the Prentice Northeast Unit. This data, along with results of pump-in/flowback and mini-frac tests were used in conjunction with fracture design and economic models to develop an optimum fracture design for this reservoir. Fracture pressure analysis and post fracture pressure decline analysis techniques were used to further refine the optimum treatment design. The optimum fracture design, developed in this manner, was then used to stimulate over 60 wells in this Unit and other Amoco operated Units producing from the Upper Clearfork formation. Results of these fracture stimulations have been excellent.

This paper presents a discussion of the collection of post-fracture pressure decline data, the analysis of this data, and the application to optimize the design of hydraulic fractures in the Upper Clearfork formation. Fracture stimulation design is presented with a framework in which maximization of return on the invested dollar is the ultimate goal.,

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