An investigation was initiated to optimize final sand concentrations and profitability in refracturing the North Ward Estes Field in Ward County, Texas.

This study involved the construction of a fracture enhanced production model. The model relates the final fracture width to the associated productivity increase. The fracture model data was utilized to determine the economic performance as a function of final sand concentration, accounting for operating expenses.

The simple mathematical procedure presented will aid the design engineer to quickly predict the average fracture width, frac fluid volume and total sand requirement.

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