连续管钻塞水平段铁屑运移机理研究

发布时间：2018-06-22 05:54

本文选题：连续管 + 钻塞　；参考：《中国安全生产科学技术》2017年06期

【摘要】：针对水平井段连续管钻磨桥塞时铁屑运移规律尚认识不清,沉积的铁屑堆积在井下工具周围而导致卡钻的问题,在欧拉坐标系下考虑相间滑移速度以及铁屑流参数,建立了三维井眼环空铁屑运移模型,采用Standardκ-ε湍流模型及SIMPLEC算法进行数值计算,研究了环空偏心度、钻塞液排量、铁屑直径、钻塞液粘度和铁屑体积分数对水平段铁屑运移的影响,得到了环空铁屑体积分数和固定铁屑床高度的分布规律。研究表明:增大钻塞液排量、减小铁屑直径、减小环空偏心度、增大钻塞液粘度和减小铁屑体积分数,可提高连续管钻塞水平段铁屑运移效率。水平段铁屑运移机理研究可为连续管钻磨桥塞卡钻问题的解决提供技术支持。
[Abstract]:In view of the fact that the rule of iron chip migration is not well understood when the continuous pipe is drilling and grinding bridge plug in horizontal well section, and the deposited iron debris accumulates around the downhole tool, which results in drilling jam, the slip velocity between phases and the parameters of iron chip flow are considered in Eulerian coordinate system. A three-dimensional model of iron chip migration in borehole annulus is established. The numerical calculation is carried out by using Standard 魏-蔚 turbulence model and SIMPLEC algorithm. The eccentricity of annulus, the displacement of slug fluid and the diameter of iron chip are studied. The effects of the viscosity of drilling fluid and the volume fraction of iron chip on the migration of iron chip in horizontal section are studied. The distribution of the volume fraction of iron chip and the height of fixed iron chip bed in annular space are obtained. The results show that increasing the discharge of drilling fluid, reducing the diameter of iron chip, decreasing the eccentricity of annulus, increasing the viscosity of drilling fluid and decreasing the volume fraction of iron chip can improve the efficiency of iron chip migration in horizontal section of continuous pipe drilling plug. The study on the transport mechanism of iron chips in horizontal section can provide technical support for the solution of bridge plug drill problem of continuous pipe drilling and grinding.
【作者单位】：长江大学机械工程学院;
【基金】：国基自然科学基金项目(51604039) 长江青年科技创新团队项目(2016cqt01) 长江大学青年基金项目(2015cqn44)
【分类号】：TE28

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