When hydraulic fracturing is performed on a rock mass which contains many natural cracks and planes of weakness, most of the induced cracks are inclined transverse cracks. A method is proposed which can be used under such a circumstance to determine the stress state. The method consists of two stages. The first stage determines the magnitude and orientation of principal stresses by using shut-in pressures of inclined transverse cracks and the circumferential position of longitudinal cracks on the wellbore surface. The second stage estimates the ranges of errors of the stress state determined in the first stage, by taking into account that the shut-in pressures and orientations of the cracks are the factors which give rise to errors of the determined stress state.
|Number of pages
|International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts
|Published - 1997 Jan