Abstract
This study presents an investigation on the effects of various polar components of a crude oil on its recovery by high and low salinity waterflooding and correspondingly on some of the suggested mechanisms in the literature. Coreflooding experiments were performed on several Berea core plugs aged in four different variants of the same crude oil with relative amounts of acids, bases, and asphaltenes. The oils labeled as acid-free, base-free, asphaltenes-free (deasphalted), and original or normal crude oil were expected to initiate varying wetting conditions during aging. The results of high salinity waterflood showed that the plug aged with base-free oil provided the highest whereas that with acid-free oil provided the lowest final oil recoveries. A reduction in residual oil saturation (Sorw) by 1.4% to 2.9% PV for normal, base-free, and asphaltene-free crude oils after low salinity waterflooding (LSW) in tertiary recovery mode was observed. For the case of acid-free crude oil, the Sorw was reduced margina...
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