Abstract
Abstract Subsurface separation criteria have been evolved empirically over the years. They are still largely based on un-tested assumptions about safety factors, comfort values and survey tool accuracy. A mathematical analysis of the probability of collision is presented. This calculation is linked by means of a decision tree to an assessment of the consequences of a well intersection. The mathematics can be simplified for the case where the two wells are parallel, enabling key features of the problem to be illustrated. A flow chart of the directional drilling tolerance setting procedure is used to show how the methods described can be used in day-to-day well planning operations. The risk based approach simplifies management of the operations and enhances safety and efficency because appropriate margins can be applied in each individual case.
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