Abstract
Introduction This paper deals with the use of Koh* determinations from pressure build-up curves as a controlling factor in primary field development. This method was recently utilized in the Ackerly (Dean Sand) Field, Dawson County, Texas. In this field conventional engineering calculations used to determine ultimate recovery, and thus profitable drilling locations, were not reliable. The Dean Sand reservoir in the Ackerly Field occurs at an approximate depth of 8530 feet, has a gross thickness of 250 feet and lithologically is an extremely dirty silt stone. Core data indicate an average porosity of 10 percent and a matrix permeability of 0.1 millidarcy. Core inspections indicate a minute vertical fracture system. The formation must be artificially stimulated to obtain commercial production.
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