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Abstract

Buzzard Bench field is one of three fields that produce coalbed methane from high volatile A bituminous coal within the Upper Cretaceous Ferron Sandstone Member of the Mancos Shale. The field is 1 mi (1.6 km) west of Orangeville, Emery County, Utah. It was discovered in 1994 and produced 10,384 mcfd and 6277 bwpd from 49 wells during July 2003.

The average depth to the coal is 3250 ft (991 m) and the average total coal thickness is 28 ft (8.5 m). Vitrinite reflectance and coal chemistry data indicate that the coals are high volatile A bituminous in rank with a weighted average ash content of 15.2%, on an as-received basis. The in-situ gas content is 282 scf/t (8.8 cm3/g). The best wells are within a narrow fairway adjacent to north-south-trending normal faults. Apparent tectonic fracturing of the coals significantly increases the permeability of the coals and deliverability to the wellbore. Production plots for many of the wells show a typical negative decline curve with the gas rate increasing as the water rate decreases. The wells have not been producing long enough to reach their peak gas rate. All wells are produced through casing after perforating and hydraulic fracture stimulation with up to 120,000 lbs (54,420 kg) of 16/30 sand carried in borate gel.

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