Abstract
ABSTRACT The assumption of constant reservoir temperature is widely used in reservoir analysis and has generally been extended to Gas Storage Engineering. However, this assumption may not be applicable to all storage fields, particularly for those high rate fields that cycle large volumes of gas through a small number of wells. A study investigating storage reservoir temperature was initiated to determine (1) if there is a significant cyclic variation in gas temperature, and (2) if there is a long term cumulative heat effect from gas storage operations. To evaluate cyclic temperature variations, electronic temperature surveys were run in several wells during both minimum and maximum content shut-in periods. A cumulative gross heat balance was performed for the reservoir to estimate the temperature effect of 20 years of gas storage cycling. The results indicate that variable reservoir temperature is possible. The impact of including variable reservoir temperatures in gas storage engineering calculations may be significant for high rate (peaking) fields, which are frequently the critical fields in a storage system. Small variations in temperature will affect maximum storage content, pressure-content modeling and, most importantly, the conclusions of gas inventory analysis.
Published Version
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