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Data for "A Pore-scale Investigation of Flow Patterns during Spontaneous and Forced Imbibition in Fractured Porous Media"
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| Created: | Apr 28, 2024 at 8:51 a.m. | |
| Last updated: | Apr 28, 2024 at 9:07 a.m. | |
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Abstract
Microfractures are ubiquitous in the subsurface due to natural factors and human activities. Imbibition patterns in fractured porous media affect various geological engineering applications, while their behaviors have not been sufficiently understood. Spontaneous and forced imbibition is conducted at different injection flow rates in four micromodels with different fracture apertures. Air and mixtures of glycerol and ethanol in different proportions are the non-wetting and wetting phases, respectively. According to the results, we identify two types of imbibition patterns: matrix preferential and fracture preferential. A higher injection flow rate, glycerol concentration, and fracture aperture promote the flow pattern transition from the matrix preferential to the fracture-preferential. The pore-scale interface behaviors influence the imbibition patterns by affecting the crossflow between fracture and matrix. The concave-to-convex transition of the meniscus is found in pore invasion and introduces a capillary resistance to inhabit the invasion. The cooperative pore filling weakens the limitation and promotes the imbibition. A higher injection flow rate increases the viscous resistance and limits the crossflow, which promotes the imbibition pattern transit from matrix- to fracture-preferential. It also enhances the cooperative pore filling and weakens the fracture-preferential imbibition caused by interface pinning. A rise in the glycerol concentration increases the viscosity and the contact angle. These two features limit the crossflow and promote the fracture-preferential. A wider fracture aperture promotes the capillary-force-dominance matrix-preferential imbibition by increasing the capillary pressure difference and the viscous-force-dominance fracture-preferential imbibition by decreasing the viscous resistance. In addition, the global capillary number is insufficient to predict the flow pattern in fractured porous media.
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