Abstract
ABSTRACT The performance of many Gulf Coast gas reservoirs are influenced by water influx from aquifers of unknown size, shape, and properties. Gajdica, et al. (1987) developed an automatic method for computing the performance of an aquifer by determining an Aquifer Influence Function (AIF). The current work investigates the use of Gajdica's AIF method to analyze the scheduling of pressure buildup tests and the effect of errors in this pressure data. Test cases were constructed in which the AIF was known. A series of computer runs showed that the AIF is more accurate if more pressure data are available. No conclusions were reached about the spacing of the pressure data, but it seems that evenly spaced pressure data is desirable. More importantly, a technique for detecting and correcting errors in pressure data was developed with the AIF method. The technique clearly shows where pressure errors occurred. Corrections to these pressure errors can then be made. This technique was applied to an actual field case and shows promise as a method for correcting pressure errors for this type of gas reservoir/aquifer system.
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