龙马克西页岩和二氧化碳制成的裂变流体之间的短期相互作用
Guojun Liu1,2, Delei Shang3,4, Liang Zhang5,2
1Hunan Engineering Research Center of Structural Safety and Disaster Prevention for Urban Underground Infrastructure, College of Civil Engineering, Hunan City University, Yiyang, Hunan, 413000, China.
Heliyon
|October 15, 2024
概括
超临界二氧化碳裂变流体会影响页岩的机械性能,降低强度和脆性. 水含量和盐水显著影响这些变化,影响页岩气的开采和封存潜力.
科学领域:
- 地质学和石油工程 石油工程
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
背景情况:
- 页岩气的开采依赖于岩石形成的裂变,以有效释放气体.
- 超临界二氧化碳 (CO2) 压裂是一种新兴的,环保的替代水基方法.
- 了解二氧化碳页岩相互作用对于优化储刺激和二氧化碳封存至关重要.
研究的目的:
- 研究基于二氧化碳的裂变流体对页岩微观结构和机械性能的影响.
- 为了评估不同CO2流体组成 (水,气态/超临界CO2,盐水混合物) 对页岩行为的影响.
- 为改善页岩气开采和二氧化碳封存策略提供见解.
主要方法:
- 模拟试验涉及向页岩水库注入各种基于二氧化碳的液体.
- 机械实验包括单轴压缩和拉伸测试,并监测声辐射.
- 使用扫描电子显微镜 (SEM),X射线衍射 (XRD) 和X射线光 (XRF) 的物理表征.
主要成果:
- 所有基于二氧化碳的流体处理都降低了页岩的单轴压力/拉伸强度,弹性模量和脆性指数.
- 将盐水添加到二氧化碳液体中,导致机械参数和脆性下降得更为显著.
- 水含量被确定为影响页岩弹性模量的一个关键因素;超临界CO2对矿物成分的影响比气态CO2更大.
结论:
- 基于二氧化碳的压裂液改变了页岩的机械特性和微观结构,水和盐水加剧了这些变化.
- 由于二氧化碳和盐水合效应,观察到页岩延展性增加和声辐射模式变化.
- 这些发现为优化 Longmaxi 等页岩水库的注入参数和透性转换提供了关键数据.
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