Production Performance Study of West Carney Field, Lincoln County, Oklahoma

Abstract

Abstract The paper describes a field case study of Hunton formation in West Carney Field in Oklahoma. The Hunton formation covers 2.7 million acres in Oklahoma and in surrounding states of Texas, New Mexico and Arkansas and is one of the most prolific oil producing reservoirs in Oklahoma. The formation is geologically complex with a large number of fractures. Some of the unique characteristics of the field include decreasing GOR at the beginning of production, increase in GOR after shut-in and sustained oil rates over long periods of time. Fluid properties analysis of data obtained from laboratory tests has indicated that the reservoir fluid is volatile oil. Reservoir fluid model is generated from fluid properties data and is used in simulating the reservoir depletion process. Production mechanism involved de-watering of the reservoir and production of oil and gas thereafter by solution gas drive. Since the reservoir fluid was observed to be volatile oil, a modified material balance method for depletion of volatile oil reservoirs was developed to calculate the initial in-place reserves and recovery factors. A single well reservoir model was developed and compositional flow simulation was carried out using GEOQUEST E300 simulator. History matching methods were used to adjust the reservoir parameters to match the field production of both oil and gas wells. Most of the unique characteristics observed in the field could be reproduced using simulation. The model is also used to evaluate different enhanced recovery methods.