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• W3143208556 abstract "Forced oil-water displacement is the crucial mechanisms of secondary oil recovery. The knowledge of relative permeability is required in the simulation of mul- tiphase flow in porous media. Obvious dynamic effect of capillary pressure occurs in that the formation of ultra-low permeability reservoir (the permeability is 1 9 10 -3 lm 2 ) is tight and the pores and throats are very small. In addition, the significant capillary end effect causes serious errors when calculating relative permeabilities. For these reasons, the JBN method (neglecting capillary pres- sure) does not apply. Therefore, the dynamic capillary pressure and capillary end effects should be taken into account. This work focuses on calculating two-phase rel- ative permeability of ultra-low permeability reservoir through considering the dynamic capillary pressure and eliminating the influence of capillary end effects. Firstly, laboratory core scale measurements of in situ water phase saturation history based on X-ray CT scanning technique were used to estimate relative permeability. Secondly, a mathematical model of two-phase relative permeability considering the dynamic capillary pressure was estab- lished. The basic problem formulations, as well as the more specific equations, were given, and the results of comparison using experimental data are presented and discussed. Results indicate that the dynamic capillary pressure measured at laboratory core scale in ultra-low permeability rocks has a significant influence on the esti- mation of unsteady-state relative permeability. The math- ematical calculating method was compared with the history matching method and the results were close, suggesting reliability for ultra-low permeability reservoirs. Impor- tantly, the proposed methods allow measurement of rela- tive permeability from a single experiment. Potentially this represents a great time savings." @default.
• W3143208556 created "2021-04-13" @default.
• W3143208556 creator A5053823409 @default.
• W3143208556 creator A5060171995 @default.
• W3143208556 date "2014-01-01" @default.
• W3143208556 modified "2023-09-27" @default.
• W3143208556 title "Determination of dynamic relative permeability in ultra-low permeability sandstones via X-ray CT technique" @default.
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• W3143208556 hasPublicationYear "2014" @default.
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