A recent study has been conducted on the "Clinton" sandstone of Ohio by the U.S. Department of Energy. The purpose of the study was to identify production mechanisms as related to the geometry of the "Clinton" sandstone. The theory behind the study was that a log-log plot of cumulative production versus time is indicative of the flow behavior in the reservoir. A 0.50 slope would indicate linear flow exists while a slope of about 0.90 would indicate radial flow exists.

Data from 284 producing "Clinton" gas wells from six counties in eastern Ohio were used in this study. Log-log plots of cumulative production versus time were generated and then the slope values were contoured so that a comparison could be made with regional geological parameters. The results of the study showed that the production mechanisms in the four regions are causing a linear to "intermediate" (between linear and radial) flow. Radial flow was exhibited in wells where the "Red Clinton" was better defined on the gamma ray log, suggesting an offshore bar or shoal. Linear flow was exhibited in wells where the "White Clinton" was more well developed suggesting channel or distributary bars.

The intent of this paper is to make available to industry a practical approach to analyze the performance of past production. This knowledge can be used to gain insight to the factors affecting recovery so that an approach to improvements can be made.

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