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论文类型：期刊论文

发表时间：2015-09-01

发表刊物：MAGNETIC RESONANCE IMAGING

收录刊物：SCIE、PubMed

卷号：33

期号：7

页面范围：918-926

ISSN号：0730-725X

关键字：Magnetic resonance imaging; Immiscible two-phase flow; Porous medium; Bond number; Capillary number

摘要：The study of immiscible fluid displacement between aqueous-phase liquids and non-aqueous-phase liquids in porous media is of great importance to oil recovery, groundwater contamination, and underground pollutant migration. Moreover, the attendant viscous, capillary, and gravitational forces are essential to describing the two-phase flows. In this study, magnetic resonance imaging was used to experimentally examine the detailed effects of the viscous, capillary, and gravitational forces on water-oil flows through a vertical straight capillary, bifurcate channel, and monolayered glass-bead pack. Water flooding experiments were performed at atmospheric pressure and 37.8 degrees C, and the evolution of the distribution and saturation of the oil as well as the characteristics of the two-phase flow were investigated and analyzed. The results showed that the flow paths, i.e., the fingers of the displacing phase, during the immiscible displacement in the porous medium were determined by the viscous, capillary, and gravitational forces as well as the sizes of the pores and throats. The experimental results afford a fundamental understanding of immiscible fluid displacement in a porous medium. (C) 2015 Elsevier Inc. All rights reserved.