气体固体双相流量特征的数值模拟研究,用于采集煤炭切片的钻井采样
Sheng Xue1,2,3, Lei Zhang3, Xiaoliang Zheng1,2,4
1State Key Laboratory of Safe Mining of Deep Coal and Environment Protection, Anhui University of Science and Technology, Huainan, Anhui, China.
PloS one
|December 4, 2025
概括
钻杆旋转在气动采样过程中显著影响煤炭颗粒的运动. 优化旋转速度和粒子大小选择可以提高煤样本中气体含量估计的准确性.
科学领域:
- 地质和采矿工程地质学和采矿工程
- 计算流体动力学的流体动力学.
- 粒子力学 粒子力学
背景情况:
- 煤炭采样准确性对于确定气体含量至关重要.
- 钻井孔内的粒子运动会影响样品暴露时间.
- 了解煤炭切片运输动态对于有效采样至关重要.
研究的目的:
- 在气动采样过程中模拟和分析煤炭切片运输.
- 量化钻杆旋转和粒子大小对粒子动态的影响.
- 确定改善煤炭样本准确性的最佳条件.
主要方法:
- 计算流体动力学 (CFD) 与离散元素方法 (DEM) 模拟相结合.
- 模拟Rosin-Rammler分布式煤炭切片的模型.
- 研究钻杆旋转速度从0到200rpm.
主要成果:
- 轴向迁移速度随着旋转速度的增加而增加,微粒 (0.5-1毫米) 显示出明显的加速.
- 由旋转引起的旋流场会影响粒子迁移,而比特几何结构阻碍了较粗的粒子 (>1毫米).
- 孔口的质量流速随着速度的增加而增加一倍,而静态条件将效率降低50%.
结论:
- 基于大小的粒子速度差异是显著的.
- 使用狭窄分级的煤样品可以提高丢失气体含量估计的准确性.
- 优化钻杆旋转和颗粒大小的选择是可靠采样煤炭的关键.
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