Measurement and correlation of conditions for entrapment and mobilization of residual oil. First annual report

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Abstract
Substantial progress has been made in four major task areas. The first task is to establish the limits of reliability of laboratory waterflooding as an evaluation tool. Wettability is identified as a key variable. Work is being extended to wetting properties of crude oils and core flooding. The second task concerns the effects of high capillary number flows on trapping phenomena and residual oil saturation. Correlations of capillary number and relative permeability behavior at reduced residual saturations have been developed for displacement in sandstones. The third task deals with mechanisms of mobilization and entrapment of residual oil. Detailed accounts have recently been presented of work on relative permeability at reduced residual oil saturations and for factors which affect the magnitude and distribution of residual oil. Work on the fourth task concerns the detailed structure of residual oil. The size distribution of residual oil blobs, obtained under various displacement conditions, is being measured by various size-analysis methods.

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