Abstract
The wettability of a crude oil/brine/rock system is of central importance in determining the oil recovery efficiency of water displacement processes in oil reservoirs. Wettability of a rock sample has traditionally been measured using one of two experimental techniques, viz. the United States Bureau of Mines and Amott tests. The former gives the USBM index, IUSBM, and the latter yields the Amott–Harvey index, IAH. As there is no well-established theoretical basis for either test, any relationship between the two indices remains unclear.
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