Three-dimensional numerical simulation of CO2 injection to enhance shale gas recovery and geological storage

被引：0

作者：

Zhao P. ^{[1
]}

Zhu H. ^{[2
,3
]}

Zhang F. ^{[4
]}

机构：

[1] State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Sichuan, Chengdu

[2] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan, Chengdu

[3] College of Energy, Chengdu University of Technology, Sichuan, Chengdu

[4] College of Civil Engineering, TongJi University, Shanghai

来源：

Natural Gas Industry | 2024年 / 44卷 / 04期

关键词：

CO[!sub]2[!/sub] enhanced shale gas recovery; CO[!sub]2[!/sub] geological storage; Reservoir heterogeneity; Thermal-hydraulic-mechanical coupling 3D model;

D O I：

10.3787/j.issn.1000-0976.2024.04.011

中图分类号：

学科分类号：

摘要：

Injecting CO2 into shale reservoirs is an effective way to reduce carbon emissions, which can not only enhance the natural gas recovery of gas reservoirs, but also achieve the goal of CO2 geological storage. Shale reservoirs have strong heterogeneity, However, few researches have been carried out on the influential mechanisms of vertical reservoir heterogeneity on CO2 enhanced CH4 recovery effect after the injection of CO2 into shale reservoirs. Taking the Wufeng-Longmaxi Formation shale reservoir in the Sichuan Basin as the research object, this paper establishes a 3D numerical model of integrated CO2 enhanced CH4 recovery and geological storage in heterogeneous shale reservoir on the basis of the thermal-hydraulic-mechanical coupling numerical simulation method which takes into account the competitive adsorption of CO2 and CH4. In addition, the reliability of the numerical simulation method is verified through the laboratory experiment results of CO2 displacing CH4. And the following research results are obtained. First, if the injection well is kept in the same horizon, the remaining CH4 in each sublayer presents an increasing trend, and the CO2 storage presents the trend of decreasing gradually with the depth increase of the production well. Second, if the production well is kept in the same horizon, the remaining CH4 in each sublayer decreases with the depth increase of the injection well, and the CO2 storage in each sublayer increases with the increase of vertical spacing between the injection well and the production well. Third, increasing vertical spacing between the injection well and the production well can result in an increase in CH4 production increment and CO2 storage. In conclusion, shale has stronger competitive adsorption to CO2 and CH4, and the related process is a complex thermal-hydraulic-mechanical coupling process. The simulation study of this basic theory is of practical significance to CO2 injection to replace CH4 for enhancing shale gas recovery and CO2 storage. What's more, the research results provide a theoretical support for the field application of the related technologies in the future. © 2024 Natural Gas Industry Journal Agency. All rights reserved.

引用

页码：104 / 114

页数：10

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