Summary Simulators have been developed to study the fracture and collapse behavior of boreholes. To take into account the directional properties of real rocks, an anisotropic stress model is used. The model takes into account anisotropic elastic properties, directional shear, and directional tensile strengths. The orientation of the borehole, the in-situ stresses, and the bedding plane can all be arbitrarily related to each other to model actual field situations. This paper presents some of the results of the model. It is shown that neglecting the anisotropic effects introduces an error. Also, studying the anisotropic model yields further insight into the behavior of the borehole.
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Bernt S. Aadnøy (1988) studied this question.