Abstract
Abstract As-received oil-base-core water saturations were used as the primary source of data for determining Sw for the Ivishak Reservoir (also referred to as the Sadlerochit Reservoir), Prudhoe Bay Field. These saturations varied from < 1% PV to 56% PV. Considerable work was done to validate the reliability of these data. This paper describes laboratory experiments, namely IFT measurements and core flushing studies, done to determine the affect a certain variables on the effect of mud filtrate invasion on resident water saturations. The IFT work suggested no movement of connate water would result from filtrate invasion although at extreme boundary conditions, the possibility could not be eliminated. The flushing studies indicated that at a range of conditions that may exist during coring, there is < 1 water saturation unit change in Sw caused by filtrate invasion.
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