FRACTAL MODELS FOR GAS-WATER TRANSPORT IN SHALE POROUS MEDIA CONSIDERING WETTING CHARACTERISTICS

doi:10.1142/S0218348X20501388

	FRACTAL MODELS FOR GAS-WATER TRANSPORT IN SHALE POROUS MEDIA CONSIDERING WETTING CHARACTERISTICS
	Zhang, Qi 2; Wu, Xinyue 2; Meng, Qingbang 2; Wang, Yan 1; Cai, Jianchao 3
刊名	FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
	2020-11-01
卷号	28 期号:7 页码:17
关键词	Fractal Gas-Water Relative Permeability Organic and Inorganic Nanopores Water Film Second-Order Slip Shale Gas
ISSN号	0218-348X
DOI	10.1142/S0218348X20501388
英文摘要	Complicated gas-water transport behaviors in nanoporous shale media are known to be influenced by multiple transport mechanisms and pore structure characteristics. More accurate characterization of the fluid transport in shale reservoirs is essential to macroscale modeling for production prediction. This paper develops the analytical relative permeability models for gas-water two-phase in both organic and inorganic matter (OM and IM) of nanoporous shale using the fractal theory. Heterogeneous pore size distribution (PSD) of the shale media is considered instead of the tortuous capillaries with uniform diameters. The gas-water transport models for OM and IM are established, incorporating gas slippage described by second-order slip condition, water film thickness in IM, surface diffusion in OM, and the total organic carbon. Then, the presented model is validated by experimental results. After that, sensitivity analysis of gas-water transport behaviors based on pore structure properties of the shale sample is conducted, and the influence factors of fluid transport behaviors are discussed. The results show that the gas relative permeability is larger than 1 at the low pore pressure and water saturation. The larger pore pressure causes slight effect of gas slippage and surface diffusion on the gas relative permeability. The larger PSD fractal dimension of IM results in larger gas relative permeability and smaller water relative permeability. Besides, the large tortuosity fractal dimension will decrease the gas flux at the same water saturation, and the surface diffusion decreases with the increase of tortuosity fractal dimension of OM and pore pressure. The proposed models can provide an approach for macroscale modeling of the development of shale gas reservoirs.
资助项目	National Natural Science Foundation of China[51904279] ; National Natural Science Foundation of China[51804284] ; Fundamental Research Funds for the Central Universities (China University of Geosciences, Wuhan)[CUGGC04] ; Foundation of Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences)[TPR2019-03]
WOS研究方向	Mathematics ; Science & Technology - Other Topics
语种	英语
出版者	WORLD SCIENTIFIC PUBL CO PTE LTD
WOS记录号	WOS:000601256800021
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/25352]
专题	中科院武汉岩土力学所
通讯作者	Cai, Jianchao
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China 3.China Univ Geosci, Inst Geophys & Geomat, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qi,Wu, Xinyue,Meng, Qingbang,et al. FRACTAL MODELS FOR GAS-WATER TRANSPORT IN SHALE POROUS MEDIA CONSIDERING WETTING CHARACTERISTICS[J]. FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY,2020,28(7):17.
APA	Zhang, Qi,Wu, Xinyue,Meng, Qingbang,Wang, Yan,&Cai, Jianchao.(2020).FRACTAL MODELS FOR GAS-WATER TRANSPORT IN SHALE POROUS MEDIA CONSIDERING WETTING CHARACTERISTICS.FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY,28(7),17.
MLA	Zhang, Qi,et al."FRACTAL MODELS FOR GAS-WATER TRANSPORT IN SHALE POROUS MEDIA CONSIDERING WETTING CHARACTERISTICS".FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY 28.7(2020):17.