在不同的CO2压力下,煤体的三轴机械和透性特性
Lipeng Chen1, Lei Wang1, Yu Zhang1
1State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Anhui 232001, China.
The Science of the total environment
|June 26, 2024
概括
煤层中的二氧化碳 (CO2) 捕获对于减少温室气体排放至关重要. 较高的二氧化碳注入压力会损害煤炭,增加断裂复杂性并影响透性,这对于安全储存至关重要.
科学领域:
- 地质技术工程 地质技术工程
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- 在煤层中捕获二氧化碳 (CO2) 是缓解温室气体排放的关键策略.
- 煤炭的机械和透性质对于安全的二氧化碳储存至关重要,并且受到二氧化碳注入压力的影响.
- 了解这些影响对于优化二氧化碳的地质储存至关重要.
研究的目的:
- 研究二氧化碳压力对煤炭机械性能和透性的影响.
- 建立一个构成模型,考虑二氧化碳吸附的煤炭损害.
- 为安全有效的二氧化碳地质储存提供理论指导.
主要方法:
- 在不同CO2压力下对煤样进行了三轴压缩透性测试.
- 使用测量系统来确定合的机械性能和吸附透性.
- 开发了一个3D统计损害构成模型,其中包含了二氧化碳吸附损害.
主要成果:
- 煤炭的应力-应变曲线呈现出四个不同的阶段,在峰值应力时具有透性"跳跃".
- 增加的二氧化碳压力导致煤炭的机械性能明显恶化,主要是通过剪切损伤.
- 较高的二氧化碳压力导致更大的内部碎片化和更复杂的断裂网络.
- 随着二氧化碳压力上升,煤炭的初始透率下降,而正常化的透率急剧增加.
结论:
- 二氧化碳注入压力显著影响煤炭的机械行为和透性演变.
- 开发的构成模型准确地反映了煤炭对二氧化碳吸附损害的反应.
- 这些发现为在地质储存项目中选择最佳的二氧化碳注入压力提供了关键的见解.
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