An effective anticollision risk management approach is essential for drilling safely in the congested subsurface environments increasingly common in today's drilling programs. Because there is as yet no industry-wide standard for collision risk assessment and management, many companies have developed their own standards, which can differ in significant details. In one recent project, both the operator and the directional drilling contractor had developed specific anticollision procedures. The challenge was to create a drilling program that satisfied the requirements of both standards. This paper describes the problems we encountered and the solutions we created to successfully design and execute a drilling plan satisfactory to both companies.

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