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Once the tactical decisions regarding steps necessary to meet asset objectives and strategies have been made, data gathering takes a pre-eminent role. Based on the definition of surveillance in Chapter 1, actions such as drilling, recompletion, conformance control, and pattern balancing will necessitate a certain type, quality, and quantity of data gathering to generate additional opportunities and make sound decisions.

The value proposition for data gathering has been advantaged by high costs, greater reservoir uncertainties because of harsher producing environments, and fewer producing wells. Because of the uncertain and sometimes ambiguous information obtained from data-gathering activities, justification for such investments becomes necessary. Quantifiable cost-benefit analysis that includes risk components provides a value-based approach to requisite investments in surveillance programs.

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