Xudi Wu, Wei Liu, Xuefei Zou, Jingyu Cao, Jianfeng Xiao, Cai Deng
{"title":"基于数字核心技术的两相非饱和细观渗流模拟研究","authors":"Xudi Wu, Wei Liu, Xuefei Zou, Jingyu Cao, Jianfeng Xiao, Cai Deng","doi":"10.1007/s40571-025-00930-3","DOIUrl":null,"url":null,"abstract":"<div><p>In recent years, digital core technology as an emerging numerical simulation method has been widely used in various fields. This study investigates the unsaturated microscopic seepage of gas–water phases in the pore-throat structure of sandstone. First, the real three-dimensional pore-throat structure of sandstone is extracted by digital core CT scanning technique. Then, a 3D numerical model that used in the unsaturated microscopic seepage is established based on the visualization image processing technology. Next, the two-phase unsaturated seepage coupling equations are developed by using the two-phase volume-averaged momentum equation and the continuity equation. Finally, by combining the two-phase saturation relation, the van Genuchten model, and the Mualem model, we realize the simulation of the two-phase unsaturated seepage in a real pore-throat structure of sandstone. The results demonstrate that the effective porosity and permeability of the model are 14.97% and 21.5 mD, respectively. The variation of wetting phase saturation is not uniform due to the existence of dominant channels in the unsaturated seepage process. The streamlines at the large pore throat are denser than elsewhere, and the velocity of the fluid is faster. The relative permeabilities of the two phases at different positions in the model are similar. Moreover, the shape of the relative permeability curve is concave. The final relative permeability of the non-wetting phase is approximately equal to 1.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"2475 - 2485"},"PeriodicalIF":2.8000,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Simulation study on the two-phase unsaturated microscopic seepage based on digital core technology\",\"authors\":\"Xudi Wu, Wei Liu, Xuefei Zou, Jingyu Cao, Jianfeng Xiao, Cai Deng\",\"doi\":\"10.1007/s40571-025-00930-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In recent years, digital core technology as an emerging numerical simulation method has been widely used in various fields. This study investigates the unsaturated microscopic seepage of gas–water phases in the pore-throat structure of sandstone. First, the real three-dimensional pore-throat structure of sandstone is extracted by digital core CT scanning technique. Then, a 3D numerical model that used in the unsaturated microscopic seepage is established based on the visualization image processing technology. Next, the two-phase unsaturated seepage coupling equations are developed by using the two-phase volume-averaged momentum equation and the continuity equation. Finally, by combining the two-phase saturation relation, the van Genuchten model, and the Mualem model, we realize the simulation of the two-phase unsaturated seepage in a real pore-throat structure of sandstone. The results demonstrate that the effective porosity and permeability of the model are 14.97% and 21.5 mD, respectively. The variation of wetting phase saturation is not uniform due to the existence of dominant channels in the unsaturated seepage process. The streamlines at the large pore throat are denser than elsewhere, and the velocity of the fluid is faster. The relative permeabilities of the two phases at different positions in the model are similar. Moreover, the shape of the relative permeability curve is concave. The final relative permeability of the non-wetting phase is approximately equal to 1.</p></div>\",\"PeriodicalId\":524,\"journal\":{\"name\":\"Computational Particle Mechanics\",\"volume\":\"12 4\",\"pages\":\"2475 - 2485\"},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2025-03-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Computational Particle Mechanics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s40571-025-00930-3\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATHEMATICS, INTERDISCIPLINARY APPLICATIONS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Computational Particle Mechanics","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s40571-025-00930-3","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATHEMATICS, INTERDISCIPLINARY APPLICATIONS","Score":null,"Total":0}
Simulation study on the two-phase unsaturated microscopic seepage based on digital core technology
In recent years, digital core technology as an emerging numerical simulation method has been widely used in various fields. This study investigates the unsaturated microscopic seepage of gas–water phases in the pore-throat structure of sandstone. First, the real three-dimensional pore-throat structure of sandstone is extracted by digital core CT scanning technique. Then, a 3D numerical model that used in the unsaturated microscopic seepage is established based on the visualization image processing technology. Next, the two-phase unsaturated seepage coupling equations are developed by using the two-phase volume-averaged momentum equation and the continuity equation. Finally, by combining the two-phase saturation relation, the van Genuchten model, and the Mualem model, we realize the simulation of the two-phase unsaturated seepage in a real pore-throat structure of sandstone. The results demonstrate that the effective porosity and permeability of the model are 14.97% and 21.5 mD, respectively. The variation of wetting phase saturation is not uniform due to the existence of dominant channels in the unsaturated seepage process. The streamlines at the large pore throat are denser than elsewhere, and the velocity of the fluid is faster. The relative permeabilities of the two phases at different positions in the model are similar. Moreover, the shape of the relative permeability curve is concave. The final relative permeability of the non-wetting phase is approximately equal to 1.
期刊介绍:
GENERAL OBJECTIVES: Computational Particle Mechanics (CPM) is a quarterly journal with the goal of publishing full-length original articles addressing the modeling and simulation of systems involving particles and particle methods. The goal is to enhance communication among researchers in the applied sciences who use "particles'''' in one form or another in their research.
SPECIFIC OBJECTIVES: Particle-based materials and numerical methods have become wide-spread in the natural and applied sciences, engineering, biology. The term "particle methods/mechanics'''' has now come to imply several different things to researchers in the 21st century, including:
(a) Particles as a physical unit in granular media, particulate flows, plasmas, swarms, etc.,
(b) Particles representing material phases in continua at the meso-, micro-and nano-scale and
(c) Particles as a discretization unit in continua and discontinua in numerical methods such as
Discrete Element Methods (DEM), Particle Finite Element Methods (PFEM), Molecular Dynamics (MD), and Smoothed Particle Hydrodynamics (SPH), to name a few.