"Chemically tuned water-flooding provides a relatively cheap method of enhanced oil recovery from carbonate and sandstone reservoirs. Several possible recovery mechanisms such as mineral dissolution, multi-component ion exchange, double-layer expansion, adsorption/desorption from rock surface, reduction in interfacial tension, and fines migration that have been proposed are widely debated. The combination of these processes may result in wettability alteration that increases sweep efficiency of water-flooding. Here, wettability alteration due to water-rock interactions will be examined numerically.
To evaluate the wettability alteration, separation between breakthrough curves of the non-reactive component and the cations based on the chromatographic separation will be used due to chemically altered water-flooding. Because the chromatographic separation only takes place at the water-wet surfaces. Breakthrough curves from a chromatographic separation of a published experimental high salinity water injection into the carbonate cores study were matched using reactive transport modeling. Geochemical reaction considering dissolution/precipitation and surface complexation processes coupled with fluid flow and transport in porous media were modeled.
The change of wettability with different parameters was consistent with the results of the surface complexation model, >CaCO3-, >CaOH2+, >CO3Mg+ and >CaSO4- strongly influence the total surface charge. For the primary ions, Ca2+ and SO42- were shown as significant factors in determining the wettability by orthogonal array test. Also, the equilibrium constant is the most important parameter in the surface complexation model, which will give the largest variance of wettability indicator"--Abstract, page iii.
Geosciences and Geological and Petroleum Engineering
M.S. in Petroleum Engineering
Missouri University of Science and Technology
x, 55 pages
© 2016 Pu Han, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Enhanced oil recovery
Oil fields -- Production methods
Electronic OCLC #
Han, Pu, "Mechanistic understanding of water-rock interactions during high-salinity water-flooding of carbonate reservoirs" (2016). Masters Theses. 7553.