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Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.277 SNIP: 0.52 CiteScore™: 1.3

ISSN Imprimer: 2151-4798
ISSN En ligne: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.2017020431
pages 295-305

ELECTROKINETIC COUPLING MODEL FOR POROUS FLOW IN TIGHT OIL RESERVOIRS

Qianhua Xiao
School of Oil and Gas Engineering, CQUST, Chongqing, 401331, China
Zhengming Yang
Institute of Porous Flow and Fluid Mechanics, UCAS, Hebei, 065007, China; PetroChina Research Institute of Petroleum Exploration and Development, Langfang, 065007, China
Xiangui Liu
Institute of Porous Flow and Fluid Mechanics, UCAS, Hebei, 065007, China; PetroChina Research Institute of Petroleum Exploration and Development, Langfang, 065007, China
Xiong Wei
Institute of Porous Flow and Fluid Mechanics, UCAS, Hebei, 065007, China; PetroChina Research Institute of Petroleum Exploration and Development, Langfang, 065007, China
Yanzhang Huang
Institute of Porous Flow and Fluid Mechanics, UCAS, Hebei, 065007, China; PetroChina Research Institute of Petroleum Exploration and Development, Langfang, 065007, China

RÉSUMÉ

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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