Two-dimensional r-z reservoir simulation and tank material balance were used to develop a prediction technique for gas reservoir performance in abnormally high pressure reservoirs. It is shown that p¯/z¯ versus Gp plot is very sensitive to the variability of the effective compressibility, ĉe. Nevertheless, our technique gets around this problem and, with availability of reliable reservoir history data, accurately predicts the reservoir performance and original gas in place, especially in single-well reservoirs such as the Cotton Valley reefs in East Texas. The calculations presented in the paper are simple and easy to use.

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