Application of acoustic borehole televiewer to measurement of in-situ stress

Based on the measured results of two boreholes 300 m borehole and 800 m in depth,respectively several application cases of acoustic borehole televiewer to the measurement of in-situ stress were revealed: detection of fissures in the rock mass,determination of test interval for measurement of in-situ stress and orientation of borehole cores.Especially for the definition and analysis of induced fissures created by hydraulic fracturing and borehole wall breakouts,there were many advantages of this equipment and method in the in-situ stress measurement to determine the orientation of the principal horizontal stress.It was shown by the comparison of the final results with those of the typical fracture impression method that the the two methods coincided with each other.In the end,a study on the estimation of magnitude of in-situ stress was described.