Abstract
Hydraulic borehole instruments can be used for the measurement of rock stress changes. The following paper describes how the observed fluid pressure changes on the instrument gages can be converted to actual rock stress changes. Laboratory investigations were performed on eight different rock types using two different types of hydraulic borehole instruments. Conclusive evidence is presented to show that the conversion of fluid pressure changes to rock stress changes can be made with confidence as soon as the elastic constacts of the rock and the stiffness of the hydraulic borehole instrument are known. The procedure for determining the stiffness of a hydraulic borehole instrument is described and the theoretical formulae required to permit fluid pressure/rock stress conversions are developed and presented.
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