Pore-scale computational study of permeability and pore space geometry in gas condensate reservoir rocks

Khimulia, V.V.; Karev, V.I.

Авторы: Khimulia V.V., Karev V.I.
Сборник: Proceedings of the 9th International Conference on Physical and Mathematical Modelling of Earth and Environmental Processes. PMMEEP 2023. Springer Proceedings in Earth and Environmental Sciences
Год издания: 2024
Место издания: Springer Cham
Первая страница: 243
Последняя страница: 256
DOI: 10.1007/978-3-031-54589-4_26
Аннотация: This paper presents the results of quantitative and qualitative studies of pore space and filtration properties of rocks of gas condensate fields based on computed tomography images. The research was carried out using ProCon X-Ray CT-MINI high-resolution scanner of the Institute for Problems in Mechanics RAS. The approach for digitally analyzing CT images using the GeoDict package is described in detail. 3D structures of the studied rocks with separation of matrix and pore space were obtained on the basis of CT images. The main filtration-capacitance properties of the rock—porosity and permeability—were determined. The digitally obtained values are in good agreement with laboratory permeability measurements, which indicates the correctness of the applied approach. It is shown that the filtration properties of the rock are close to isotropic with weak transversal anisotropy. For detailed analysis of pore space and reasons of anisotropy appearance, geodesic tortuosity measurements and analysis of percolation paths were carried out. The local porosity point distribution along the directions in the specimen was obtained, and the connectivity of the pore space was evaluated. It is shown that the causes of permeability anisotropy are a combination of pore space features, such as different channel tortuosity along the directions in the rock, different width of percolation paths, local porosity variation along specimen slices, and non-uniform distribution of pore space connectivity. The data necessary for filling the hydrodynamic model of the field, as well as for a better understanding of the fundamentals of the relationship between the filtration process and the structure of the pore space in rocks were obtained. The conducted digital studies are an irreplaceable tool for studying the internal structure of rocks, as well as they complement and expand significantly the range of results obtained by laboratory methods. Their application in conjunction with classical rock testing can help solve important problems in the oil and gas production industry, such as permeability drop in the vicinity of wells, loss of wellbore stability, sand production and operational accidents.The Research Was Supported by the Russian Science Foundation Grant № 23–77-01,037, https://rscf.ru/project/23-77-01037/
Добавил в систему: Химуля Валерий Владимирович

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Pore-scale computational study of permeability and pore space geometry in gas condensate reservoir rocksстатья

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