Relative wetting properties of crude oils in Berea sandstone
Sixty-one oils were collected from 21 states and the wettability of each oil determined at both 25 and 60/sup 0/C. Independent wettability determinations were made on 21 samples incubated for a minimum of 1,000 hours at 60/sup 0/C. All determinations were made using Berea sandstone and a synthetic brine. The sulfur and nitrogen content, interfacial tension, and acid numbers were obtained and, while attempts wre made to correlate these parameters with wettability, no simple correlations were discovered. However, residual oil was demonstrated to be dependent upon wettability. For the range studied--that is, neutral to water-wet--residual oil saturations were observed to decrease as wettability varied from water-wet to neutral. The polar organic compounds were extracted from the crude oils, and the amount of extract was compared to the wetting properties of the oils, but considerable variance in the data was observed. However, addition of 5 percent polar extract to a mineral oil consistently lowered the wettability number of the mineral oil-brine-Berea sandstone system by an amount greater than 40 percent.
- Research Organization:
- Department of Energy, Bartlesville, OK (USA). Bartlesville Energy Technology Center
- OSTI ID:
- 6396653
- Report Number(s):
- BETC/RI-78/9
- Country of Publication:
- United States
- Language:
- English
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