基于连续和双介质的钻井气流的比较和分析
Hao Yongjiang1,2, Hu Jie3,4
1College of Safety and Emergency Management Engineering, Taiyuan University of Science and Technology, 030024, Taiyuan, Shanxi, People's Republic of China. haoyongjiang@tyust.edu.cn.
Scientific reports
|July 18, 2025
概括
一个新的双介质模型准确地模拟了钻井期间的煤层气流,优于传统的连续介质模型. 这项研究提高了对气体排放率和累积流量的理解,以改善现场预测.
科学领域:
- 地质科学 地质科学
- 采矿工程 采矿工程 采矿工程
- 计算流体动力学的流体动力学.
背景情况:
- 在煤层中精确建模气流对于安全高效的钻井操作至关重要.
- 现有的连续介质模型往往无法捕捉到煤炭中复杂的孔隙断裂系统动态.
- 了解钻井气体排放对于预测气体危险和优化开采至关重要.
研究的目的:
- 开发和验证一个数学模型,以更好地代表现场条件的煤炭钻井气流.
- 使用现场数据,将双介质模型与连续介质模型的预测精度进行比较.
- 分析钻井过程中气体排放率和累积流量的变化特征.
主要方法:
- 建立了基于质量保存定律的数学模型,用于连续和孔裂双介质.
- 使用有限差异方法分离物理模型,并通过VB编程执行数值计算.
- 使用一系列孔流量计和高精度气体计测量实际的钻井气体流量.
主要成果:
- 双介质模型对气体排放率和累积流量的模拟结果显示,与测量数据的一致性更高.
- 与现场测量相比,连续介质模型表现出显著的偏差.
- 数字模拟成功捕获了钻井气体流量参数的变化特征.
结论:
- 孔裂双介质模型比连续介质模型更准确地表示了煤层中实际的钻井气流.
- 经过验证的双媒体模型可以可靠地用于预测煤炭开采和勘探中的气体流动行为.
- 这项研究强调了考虑双孔系统对于在破碎煤层中精确的气流模拟的重要性.
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