在两个冷却模式下研究高温花岩的故障机制
Chun Li1, Gan Feng2, Xinran Zhang3,4
1School of Mining Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China.
Scientific reports
|July 7, 2024
概括
这项研究研究了花岩.
科学领域:
- 地质技术工程 地质技术工程
- 材料科学 材料科学 材料科学
- 地热能源 地热能源
背景情况:
- 热干岩 (HDR) 的地热开发涉及极端的温度波动,影响岩石质量的完整性.
- 了解热应力下的岩石质量行为对于钻井井的稳定性和水库性能至关重要.
研究的目的:
- 研究花岩在不同温度和冷却方法下发生的断裂机制.
- 为地热能源提取中钻井故障和热破裂提供理论参考.
主要方法:
- 在不同温度下处理的花岩样本上进行单轴压缩试验和微试验.
- 扫描电子显微镜 (SEM) 分析断裂模式和矿物成分变化.
- 自然冷却与水冷却方法的比较分析.
主要成果:
- 在这两种冷却方法下,花岩的压力强度随着温度的增加而下降.
- "Y"类型的剪切故障是主要的故障模式.
- 与自然冷却相比,水冷却造成的样本损伤明显更大,这是SEM证实的.
- 在高达600°C的温度下观察到花岩中明显的矿物和元素变化.
结论:
- 高温和快速冷却大大降低了花岩的机械性能.
- 这些发现为热干岩地热开发的地力学挑战提供了关键的见解.
- 这项研究有助于预测和减轻地热系统中井口和水库损坏.
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