Adequate estimation of the field behavior during primary and enhanced recovery period requires representative laboratory measurements. Moreover, the estimation of the behavior from mercury capillary pressure data is important when routine measurements cannot be performed, as in the case of very small core plugs or drill-cuttings. The estimation is also important when there is need to minimize core analysis cost or when the measurements of the behavior are of questionable accuracy, as in the case of reservoir rocks with microfractures.

The objective of this study is to develop new empirical recovery efficiency and permeability correlations to improve the accuracy of estimating behavior of fluid flow through various layers of sandstone reservoir rocks. The correlations were developed from 450 experimentally obtained mercury capillary pressure measurements, using non-linear multiple regression analyses approach.

The correlations are simple to use and can be used in a reservoir simulator with appropriate rock and fluid property data to predict field production performance. The predictive strength of the new empirically derived correlations for sandstones were found to be superior to the existing correlations for estimating recovery efficiency and permeability.

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