Study of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology

Abstract Diffusion is an important mass transfer mode of tight sandstone gas. Since nano-pores are extensively developed in the interior of tight sandstone, a considerable body of research indicates that the type of diffusion is mainly molecular diffusion based on Fick’s law. However, accurate model...

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Autores principales:	Hong-Lin Zhu, Shou-Feng Wang, Guo-Jun Yin, Qiao Chen, Feng-Lin Xu, Wei Peng, Yan-Hu Tan, Kuo Zhang
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2018
Materias:	Tight sandstone gas Nano-CT Digital core Molecular diffusion Numerical simulation Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/fcfad6cb2f8d47a1826866d3854043eb
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spelling	oai:doaj.org-article:fcfad6cb2f8d47a1826866d3854043eb2021-12-02T04:57:57ZStudy of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology10.1007/s12182-017-0210-11672-51071995-8226https://doaj.org/article/fcfad6cb2f8d47a1826866d3854043eb2018-01-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-017-0210-1https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract Diffusion is an important mass transfer mode of tight sandstone gas. Since nano-pores are extensively developed in the interior of tight sandstone, a considerable body of research indicates that the type of diffusion is mainly molecular diffusion based on Fick’s law. However, accurate modeling and understanding the physics of gas transport phenomena in nano-porous media is still a challenge for researchers and traditional investigation (analytical and experimental methods) have many limitations in studying the generic behavior. In this paper, we used Nano-CT to observe the pore structures of samples of the tight sandstone of western of Sichuan. Combined with advanced image processing technology, three-dimensional distributions of the nanometer-sized pores were reconstructed and a tight sandstone digital core model was built, as well the pore structure parameters were analyzed quantitatively. Based on the digital core model, the diffusion process of methane molecules from a higher concentration area to a lower concentration area was simulated by a finite volume method. Finally, the reservoir’s concentration evolution was visualized and the intrinsic molecular diffusivity tensor which reflects the diffusion capabilities of this rock was calculated. Through comparisons, we found that our calculated result was in good agreement with other empirical results. This study provides a new research method for tight sandstone digital rock physics. It is a foundation for future tight sandstone gas percolation theory and numerical simulation research.Hong-Lin ZhuShou-Feng WangGuo-Jun YinQiao ChenFeng-Lin XuWei PengYan-Hu TanKuo ZhangKeAi Communications Co., Ltd.articleTight sandstone gasNano-CTDigital coreMolecular diffusionNumerical simulationScienceQPetrologyQE420-499ENPetroleum Science, Vol 15, Iss 1, Pp 68-76 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Tight sandstone gas Nano-CT Digital core Molecular diffusion Numerical simulation Science Q Petrology QE420-499
spellingShingle	Tight sandstone gas Nano-CT Digital core Molecular diffusion Numerical simulation Science Q Petrology QE420-499 Hong-Lin Zhu Shou-Feng Wang Guo-Jun Yin Qiao Chen Feng-Lin Xu Wei Peng Yan-Hu Tan Kuo Zhang Study of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology
description	Abstract Diffusion is an important mass transfer mode of tight sandstone gas. Since nano-pores are extensively developed in the interior of tight sandstone, a considerable body of research indicates that the type of diffusion is mainly molecular diffusion based on Fick’s law. However, accurate modeling and understanding the physics of gas transport phenomena in nano-porous media is still a challenge for researchers and traditional investigation (analytical and experimental methods) have many limitations in studying the generic behavior. In this paper, we used Nano-CT to observe the pore structures of samples of the tight sandstone of western of Sichuan. Combined with advanced image processing technology, three-dimensional distributions of the nanometer-sized pores were reconstructed and a tight sandstone digital core model was built, as well the pore structure parameters were analyzed quantitatively. Based on the digital core model, the diffusion process of methane molecules from a higher concentration area to a lower concentration area was simulated by a finite volume method. Finally, the reservoir’s concentration evolution was visualized and the intrinsic molecular diffusivity tensor which reflects the diffusion capabilities of this rock was calculated. Through comparisons, we found that our calculated result was in good agreement with other empirical results. This study provides a new research method for tight sandstone digital rock physics. It is a foundation for future tight sandstone gas percolation theory and numerical simulation research.
format	article
author	Hong-Lin Zhu Shou-Feng Wang Guo-Jun Yin Qiao Chen Feng-Lin Xu Wei Peng Yan-Hu Tan Kuo Zhang
author_facet	Hong-Lin Zhu Shou-Feng Wang Guo-Jun Yin Qiao Chen Feng-Lin Xu Wei Peng Yan-Hu Tan Kuo Zhang
author_sort	Hong-Lin Zhu
title	Study of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology
title_short	Study of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology
title_full	Study of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology
title_fullStr	Study of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology
title_full_unstemmed	Study of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology
title_sort	study of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology
publisher	KeAi Communications Co., Ltd.
publishDate	2018
url	https://doaj.org/article/fcfad6cb2f8d47a1826866d3854043eb
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Study of the numerical simulation of tight sandstone gas molecular diffusion based on digital core technology

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