ABSTRACT
To determine all of the components of in situ stress from core discing, both the directions and magnitudes of the principal in situ stresses must be determined for a disc of a given thickness. In this study, we analyzed the direction of tensile stress below an HQ core stub for 11 core lengths using stress conditions under which core discing is likely to occur. Based on the results, we proposed a method for determining directions of in situ stress from the height distribution at the periphery of the end surface of a disc with any thickness. This method was applied to discs obtained from a field where hydraulic fracturing was performed to measure horizontal stresses. The results showed that the azimuths of the principal stresses estimated from core discing were consistent with those of the principal horizontal stresses determined by hydraulic fracturing.
