多期次应力变化对砂岩渗透率和孔隙结构影响的试验研究

秘昭旭; 王福刚; 石娜; 于景宗; 孙兆军

doi:10.11779/CJGE201805011

多期次应力变化对砂岩渗透率和孔隙结构影响的试验研究 English Version

秘昭旭;
1,王福刚*
1,石娜;
2,于景宗;
3,孙兆军;
1

详细信息

作者简介:
秘昭旭（1993- ）,男,硕士研究生,主要研究方向为地下水渗流与地下多组分反应溶质运移。E-mail: mizx2012@qq.com。

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出版历程
- 修回日期: 2017-03-15
- 发布日期: 2018-05-24

Experimental study on effect of multi-stage stress variations on permeability and pore structure of sandstone

1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China;
2. Jilin Institute of Geological Sciences, Changchun 130012, China;
3. China Water Northeastern Investigation, Design & Research Co., Ltd., Changchun 130021, China

摘要

- 二氧化碳地质储存 /
- 渗透率 /
- 围压 /
- 注入压 /
- 孔隙结构
Abstract: The variations of reservoir stress caused by the multi-stage and discontinuous nature of the process in the CO₂ geological storage, leading to the change of permeability and pore structure of the rock, have a direct impact on CO₂ injection and storage. Through laboratory experiments, variations in the permeability of sandstone in the Liujiagou formation of the Ordos CCS (CO₂ capture and storage) demonstration project are analyzed under cyclic variations in injection pressure and confining pressure and multi-stage loading and unloading. In addition, the variations in the micro-pore structure are analyzed based on micro-pore structure tests. The main conclusions are as follows: (1) Both the confining pressure and the injection pressure have a significant effect on the permeability of the reservoir rock. And the influence degree can reach 30% and 80%, respectively. The relative permeability changes with pressure, and it between the loading and unloading stages is higher at low pressures than at high pressures. (2) Mathematical models of permeability as a function of confining pressure and injection pressure are constructed. The mathematical models representing different cyclical processes are quite different. (3) The effects of the interval between the experiments on permeability changes are different for different pressure modes. The rock permeability can recover better under the injection pressure variation than confining pressure variation. (4) The variations during multiple stress cycles have a significant effect on the micropore structure. The increase in micropores with mesopores at small widths and the decrease of macropores result in a decrease in the permeability of the rock samples.

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参考文献(20)

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