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ISSN Печать: 2151-4798
ISSN Онлайн: 2151-562X
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ELECTROKINETIC COUPLING MODEL FOR POROUS FLOW IN TIGHT OIL RESERVOIRS
Краткое описание
To meet the needs of engineering calculations, the forces acting on a fluid are discussed and the state of being is analyzed for fluids in micro-/nanochannels. A method for correcting fluid viscosity is proposed. This study shows that the major interaction forces in the micro-/nanochannel are surface forces. The fluid exists in two forms: electrical double layer (EDL) fluid and bulk fluid. The new electrokinetic coupling model is established based on correcting the viscosity of the EDL fluid and the theory of Hagen–Poiseuille flow and electroosmotic flow. The model was calculated assuming that the fluid is 1-mM NaCl. The calculation shows that the volumetric flow rate of the electrokinetic coupling model is considerably smaller than that of the Hagen–Poiseuille flow when there is no applied DC electric field. Adverse electroosmosis is one of the important factors weakening the volumetric flow rate. The adverse electroosmosis can almost be ignored when the dimensionless ratio d (the ratio between the channel diameter and the EDL thickness) is greater than 100. The volumetric flow rate is weakened significantly by increasing the surface-to-volume ratio, and it can be increased considerably more effectively by an appropriately applied DC electric field when combined with pressure.
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Xiao Qianhua, Wang Zhiyuan, Yang Zhengming, Xiang Zuping, Liu Zhonghua, Yang Wei, Novel method for determining the lower producing limits of pore-throat radius and permeability in tight oil reservoirs, Energy Reports, 7, 2021. Crossref