Title: Reservoir waterflood residual oil saturation from laboratory tests
Abstract: The oil reserves from tertiary recovery processes largely come from the oil left in the water-swept region of a reservoir. The oil saturation in the water-swept region will be near the waterflood residual oil saturation in reservoirs containing oils of less than about 10 cp viscosity. Evaluation of tertiary methods then requires a quantitative measure of this saturation. Quantitative values for the residual oil saturation can usually be obtained only from one or more of 4 sources: (1) in situ measurement by logs, (2) oil content of cores taken with a pressure core barrel from the water-swept region, (3) oil content of cores cut in a water-base mud but depressured when lifted to surface, and (4) laboratory waterflood testing. The results of a theoretical and experimental study of sources 3 and 4 are given. For reliable residual oil data and other data, such as relative permeability, preserved cores, saturated with live reservoir oil and brine, must sometimes be used. The oil saturation of a pressure depleted, water-base mud-cut core from an area of the reservoir containing no free gas depends upon 2 depletion mechanisms. (33 refs.)
Publication Year: 1972
Publication Date: 1972-01-01
Language: en
Type: article
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