Spontaneous Imbibition Modeling Coupled with Fractal Approach in Low Permeability Gas Reservoir
作者单位：中国石油大学(北京)
学位级别：硕士
导师姓名：王秀宇
授予年度：2020年
学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程]
摘 要：Spontaneous imbibition（SI）refers to displacement of non-wetting phase by wetting phase fluids in porous media which driven by capillary *** imbibition plays an important role in terms of increasing hydrocarbon recovery in low-permeability and tight *** this study,we derived a new analytical model of spontaneous imbibition height in low-permeability reservoir considering effective viscosity,surface roughness,slip and gravity effects in a single tortuous capillary ***,analytical solutions of imbibition height are derived in a single tortuous rough capillary tube with and without gravity ***,our analytical model closely matches with experimental results from literatures in typical low-permeability core ***,sensitivity studies are conducted to discuss the effect of surface fractal dimension,effective viscosity,contact angle,interfacial tension,pore sizes and slip length on imbibition height,*** results show that imbibition height inversely proportional to surface fractal dimension,effective viscosity,and contact angle on rough *** surface fractal dimension,effective viscosity and contact angle decrease imbibition height *** the contrary,the imbibition height is proportional to pore radius,IFT,and slip *** the slip effect results in underestimation of imbibition height in nanopore sizes,and insignificant changes are observed for micropore *** presented models have clear physical meaning in every parameter on the imbibition height performance.
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