期刊
ACS OMEGA
卷 6, 期 19, 页码 12841-12852出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.1c01221
关键词
-
资金
- College of Petroleum and Geoscience, at King Fahd University of Petroleum Minerals
This study examines the relationship between reservoir rock wettability and crude oil adsorption, mineral surface charge, and pH change. Results indicate that clay mineral surface charge is influenced by salts, affecting the adsorption of hydrocarbon components.
Reservoir rock wettability has been linked to the adsorption of crude fractions on the rock, with much attention often paid to the bulk mineralogy rather than contacting minerals. Crude oil is contacted by different minerals that contribute to rock wettability. The clay mineral effect on wettability alterations is examined using the mineral surface charge. Also, the pH change effect due to well operations was investigated. Clay mineral surface charge was examined using zeta potential computed from the particle electrophoretic mobility. Clay minerals considered in this study include kaolinite, montmorillonite, illite, and chlorite. Results reveal that the clay mineral charge development is controlled by adsorption of ionic species and double layer collapse. Also, clay mineral surface charge considered in this study shows that their surfaces become more conducive for the adsorption of hydrocarbon components due to the presence of salts. The salt effect is greater in the following order: NaHCO3 < Na2SO4 < NaCl < MgCl2 < CaCl2. Furthermore, different well operations induce pH environments that change the clay mineral surface charge. This change results in adsorption prone surfaces and with reservoir rock made up of different minerals, and the effect of contacting minerals is critical as shown in our findings. This is due to the contacting mineral control wettability rather than the bulk mineralogy.
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