A Hybrid Approach To Improve Reserves Estimates in Waterdrive Gas Reservoirs

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Summary: The conventional reserves estimate methods for waterdrive reservoirs are well established. Typically, the techniques proposed by Havlena and Odeh (1963 and 1964) and McEwen (1962) are used. In general, the reserves estimated from these procedures are not unique since the recorded historical production data are simultaneously solved for aquifer parameters and reserves. Normally, multiple combinations of reserves and aquifer parameters match the field data equally well. Hence, a range of reserves—rather than a unique value—is found. The upper and lower limits of the reserves range may vary several-fold. In this paper, a hybrid approach that makes use of available methods is used to narrow the reserves range estimates in water-drive gas reservoirs. The hybrid approach combines the McEwen method, apparent gas-in-place (GIP) vs. time, the modified Roach (1981) method, and the modified Havlena and Odeh method for partial waterdrive.

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