Well design and planning procedures that integrate mechanical borehole stability analyses can improve overall drilling efficiency and reduce lost time costs substantially. The two key requirements needed to achieve these potential savings are, firstly, effective modelling processes that use all the available information from existing wells and, secondly, communication of the end results in a form that is easily applicable at field level. In this paper we describe both a model and communication method that have been used for several years with considerable success. The end products from such analyses are presented in easily understood graphical and numerical formats developed in response to the requirements of several operators. The computation and presentation are entirely computer-based and are an example of an application that can be incorporated readily into existing computer aided design systems within the industry with the goal of reducing drilling costs significantly.

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