Abstract
This paper proposes a method for determining the gas recovery of water-drive gas reservoirs. First, the water influx coefficient B in the theoretical formula p r = (1-R g)/(1-R g B) is used to determine the influence of the aquifer behavior. According to the theoretical formula, the relationship between the normalized pressure p r and the degree of the reserve recovery R can be obtained with different values of B, which can be used to determine the activity level of the aquifer behavior. Second, according to p ra = (1-R ga)/(1-aE va) (where a = 1-S gr/S gi), the relationship between the normalized abandonment pressure p ra and the ultimate gas recovery R ra can be obtained, as the Agarwal end-point line. The intersection of the above two lines represents the value of the estimated ultimate gas recovery and the normalized abandonment pressure p ra. Finally, an evaluation table and a set of demarcation charts are established, with different values of S gr/S gi and E va as well as the water influx coefficient B, which can be used to determine the gas recovery of water-drive gas reservoirs with different activity levels of the aquifer behavior.
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Project supported by the National Natural Science Foun- dation of China (Grant Nos. 41274114, 51274169), the Natio- nal Science and Technology Major Project of China (Grant No. 2011ZX05045).
Biography: LI Min (1962-), Male, Ph. D., Professor
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Li, M., Li, T., Jiang, Q. et al. The gas recovery of water-drive gas reservoirs. J Hydrodyn 27, 530–541 (2015). https://doi.org/10.1016/S1001-6058(15)60513-3
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DOI: https://doi.org/10.1016/S1001-6058(15)60513-3