Overton Field is located in Smith County, Texas, approximately 20 miles southeast of Tyler on the western flank of the Sabine uplift in the east Texas basin. The field produces from the Taylor interval (Cotton Valley), the lowest member of the Jurassic Cotton Valley. As is typical of most production from the Cotton Valley sands, the interval has low permeability, with distribution of rock quality controlled by a complex depositional and diagenetic history. Southwestern Energy Production Company (Southwestern) acquired the field in 2000 with 16 existing wells. The field was purchased based on evaluation of the geologic, engineering and completion data that suggested that significant extension and infill opportunities existed. Since then Southwestern has successfully drilled and completed 105 wells and expanded the acreage from 8,800 to 24,000 acres. Production has been increased from 1.5 MMCFD to 63 MMCFD in early 2004. The success of this development has been the result of coordinated iterative interpretation of geological and engineering data, improved completion practices, and innovative operational and drilling processes that have minimized costs. Development is expected to continue at least through 2005.

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