@inproceedings{724383c35a114e7fb49d27e3bbe3678a,
title = "Stability analysis of vertical boreholes using a three-dimensional hoek-brown strength criterion",
abstract = "Borehole stability analysis plays an important role in the design of oil and gas well drilling. A main aspect of borehole stability analysis is the selection of an appropriate rock strength criterion. The two most commonly used rock strength criteria in borehole stability analysis are the Mohr-Coulomb criterion and the Drucker-Prager criterion. However, the Mohr-Coulomb criterion ignores the effect of the intermediate principal stress and is too conservative in estimating the critical overbalance pressure required to maintain borehole stability; while the Drucker-Prager criterion overestimate the effect of the intermediate principal stress and may result in non-sensible stability predictions. In this paper, a simple model based on a three-dimensional (3D) Hoek-Brown strength criterion is developed for stability analysis of vertical boreholes. Examples are presented to show the application of the 3D Hoek-Brown strength criterion for analyzing the stability of vertical boreholes and the results are compared with those using the Mohr-Coulomb and Drucker-Prager criteria. It shows that the 3D Hoek-Brown strength criterion predicts critical overbalance pressure values that are less conservative than those predicted by the Mohr-Coulomb criterion yet are not as unconservative as those predicted by the Drucker-Prager criterion.",
keywords = "Boreholes, Stability, Three-dimensional analysis",
author = "Lianyang Zhang and Radha, {K. C.}",
year = "2010",
doi = "10.1061/41095(365)25",
language = "English (US)",
isbn = "9780784410950",
series = "Geotechnical Special Publication",
number = "199",
pages = "283--292",
booktitle = "GeoFlorida 2010",
edition = "199",
note = "GeoFlorida 2010: Advances in Analysis, Modeling and Design Conference ; Conference date: 20-02-2010 Through 24-02-2010",
}