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在大位移、大斜度定向井中,岩屑携带困难,极易形成岩屑床,导致蹩钻或卡钻,严重影响钻井的安全和工作效率。该文研究了一种新型的岩屑床清除钻杆,采用计算流体动力学对其工作流场进行数值模拟,使用滑移网格方法模拟了清除钻杆的真实转动。通过速度云图、流线图和切应力分布曲线等计算结果分析了该钻杆清除岩屑床的工作机理。采用多相流模型研究了在不同的斜度下重力对岩屑床清除钻杆工作流场的影响,并考察了固定斜度时清除钻杆转速对岩屑清除效果的影响,得出了相应结论。通过计算,证实了该清除钻杆能够有效地解决大斜度大位移井岩屑床的清洁问题,并对其工程实际应用提供了有效的理论支持和技术指导。
In large displacements and high-inclination directional wells, the cuttings are difficult to carry, which makes it easy to form cuttings beds, resulting in the bored or stuck drill, which seriously affects drilling safety and work efficiency. In this paper, a new type of drill pipe removal drill pipe is studied. The computational fluid dynamics (CFD) is used to simulate the working flow field and the slip grid method is used to simulate the real rotation of the drill pipe. The working mechanism of the drill pipe removal of the cuttings bed is analyzed by the calculation results of the velocity cloud, the flow chart and the shear stress distribution curve. Using multiphase flow model, the influence of gravity on the flow field of drill pipe removal with drill bittings under different inclinations was studied. The effect of removal of drill pipe speed on the removal of drill cuttings was also investigated. in conclusion. Through the calculation, it is confirmed that the drill pipe can effectively solve the problem of cleaning the cuttings bed in the large-inclination and large-displacement well, and provides effective theoretical support and technical guidance for its practical application.