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Type: Journal article
Title: A Semi-analytical model for pressure-dependent permeability of tight sandstone reservoirs
Author: Zhu, S.
Du, Z.
Li, C.
Salmachi, A.
Peng, X.
Wang, C.
Yue, P.
Deng, P.
Citation: Transport in Porous Media, 2018; 122(2):235-252
Publisher: Springer
Issue Date: 2018
ISSN: 0169-3913
Statement of
Su-Yang Zhu, Zhi-Min Du, Chuan-Liang Li, Alireza Salmachi, Xiao-Long Peng, Chao-Wen Wang, Ping Yue, Peng Deng
Abstract: In tight gas reservoirs, permeability is pressure dependent owing to pore pressure reduction during the life of the reservoir. Empirical models are commonly used to describe pressure-dependent permeability. In this paper, it was discussed a number of issues which centered around tight sandstone pressure-dependent permeability experiment, first to apply core aging on permeability test and then to develop a new semi-analytical model to predict permeability. In tight sandstone permeability test experiment, the microinterstice between core and sleeves resulted in over estimation of dependency of permeability on pressure. Then, a new semi-analytical model was developed to identify the relation between permeability and fluid pressure in tight sandstone, which indicates there is a linear relation between pore pressure changes and the inverse of permeability to a constant power. Pressure-dependent permeability of 8 tight sandstone core samples from Ordos Basin, China, was obtained using the modified procedure, and results were perfectly matched with the proposed model. Meanwhile, the semi-analytical model was also verified by pressure-dependent permeability of 16 cores in the literature and experiment results of these 24 cores were matched by empirical models and the semi-analytical model. Compared with regression result of commonly used empirical models, the semi-analytical model outperforms the current empirical models on 8 cores from our experiment and 16 cores from the literature. The model verification also indicates that the semi-theoretical model can match the pressure-dependent permeability of different rock types. In addition, the permeability performance under reservoir condition is discussed, which is divided into two stages. In most tight gas reservoirs, the permeability performance during production is located in stage II. The evaluation result with proposed experiment procedure and the stress condition in stage II will reduce permeability sensitivity to stress.
Keywords: Tight gas; pressure-dependent permeability; reservoir condition; microinterstice; stress sensitivity
Rights: © Springer Science+Business Media B.V., part of Springer Nature 2018
DOI: 10.1007/s11242-018-1001-x
Appears in Collections:Aurora harvest 3
Chemical Engineering publications

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