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Effect of Polyvinyl Alcohol in Inner Aqueous Phase on Stability of millimeter-scale Capsules

Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 506-511页

作者：黄乐平 LI Shidong ZHANG Jiabei PAN Chenchen 赵瑾朝 School of Material Science and Engineering Wuhan Textile UniversityWuhan 430200China Hubei Provincial Engineering Laboratory for Clean Production and High Value Utilization of Bio-Based Textile Materials Wuhan Textile UniversityWuhan 430200China

The millimeter-scale capsules with controllable morphology,ultra-low permeability and excellent mechanical stability were fabricated by millifluidics.Viscosity of inner phase was adjusted to control the morphology and properties of the capsules.In detail,as the concentration of polyvinyl alcohol(PVA)increased from 0 to 8% in the inner phase of the capsules,the diameter of capsules decreased from 3.33 ± 0.01mm to 2.97 ± 0.01 mm,the shell thickness of capsules decreased from 0.183 ± 0.004 mm to 0.155 ± 0.003 mm.While the capsules had round shape and high sphericity.Notably,the capsules with 2% PVA in the inner phase had remarkably decreased water permeability and good morphological stability.Specifically,the end-time of water losing of the capsules was up to 49 days,while the dehydrated capsules maintained spherical appearance,and crushing force of the capsules was up to 13.73 ± 0.79 N,which ensured stability during processing and transportation.This research provides a new strategy for stable encapsulation of small molecules.

关键词： capsule millimeter-scale millifluidics polyvinyl alcohol viscosity

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Experimental Research on the millimeter-scale Distribution of Oil in Heterogeneous Reservoirs

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1521-1534页

作者： Zhao Yu Exploration&Development Research Institute Daqing Oilfield CompanyDaqing163712China Heilongjiang Provincial Key Laboratory of Reservoir Physics&Fluid Mechanics in Porous Media Daqing163712China

Oil saturation is a critical parameter when designing oil field development plans.This study focuses on the change of oil saturation during water flooding.Particularly,a meter-level artificial model is used to conduct relevant experiments on the basis of similarity principles and taking into account the layer geological characteristics of the reservoir.The displacement experiment’s total recovery rate is 41.35%.The changes in the remaining oil saturation at a millimeter-scale are examined using medical spiral computer tomography principles.In all experimental stages,regions exists where the oil saturation decline is more than 10.0%.The shrinkage percentage is 20.70%in the horizontal well production stage.The oil saturation reduction in other parts is less than 10.0%,and there are regions where the oil saturation increases in the conventional water flooding stage.

关键词： Heterogeneous reservoir millimeter-scale oil saturation MSCT scan method oil displacement experiment

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