In 1986 Arco Oil & Gas Company commenced an on-going development drilling program in the Oak Hill field area of east Texas. The formation of interest was the Taylor section of the Cotton Valley tight gas sand. Wells required stimulation with massive hydraulic fracture treatments due to the extremely low matrix permeability. This paper presents a case history of the stimulation program over an 18 month period during which 28 wells were fractured. The evolution of the fracture design is discussed in six phases of design change and evaluation.

The importance of real-time continuous quality control information is shown for identifying problems which if undetected could lead to an incorrect evaluation of the treatment design. Improvements are shown through on-site analysis of treatment data and evaluation of production results.

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