Abstract
In situ rock stress measurements by small-scale hydraulic fracturing were performed in two salt beds in the Texas Panhandle, approximately 60 km (36 miles) south of Amarillo, Texas. Data analysis indicates that small-scale hydraulic fracturing is applicable for determining the magnitude of the minimum principal stress and the direction of the maximum stress in salt. However, when hydraulic fracturing equations based on elasticity are applied to salt (a non-elastic medium), anomalously high in situ maximum stress and tensile strength values are calculated. Due to the non-elastic properties of salt and it's solubility, neither the derived maximum stress nor the tensile strength values are considered valid using the elastic hydraulic fracturing stress equations.
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