Operators planning drilling operations in the Rocky Mountain Region must often consider the possible dangers and complications which could result from encountering hydrogen sulfide while drilling.1  Many types of services and equipment are currently available to operators yet few objective guidelines exist to assist the operator in choosing appropriate safeguards. Because both overprotection and under-protection are costly, some objective means of decision making are required.

This report presents a logical and generic approach to aid the operator in making consistent, cost effective decisions. Variables related to the health and welfare of workers and residents are con- sidered, as are factors involving maintenance of property. A decision tree approach is used to priori- tize considerations. Legal, ethical and cost considerations will be evaluated together with optional individual preferences for procedures and equipment to achieve maximum safety on location at reasonable expenditure.

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