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摘要: 为了降低水平井岩屑运移困难,钻头泥包问题。提高PDC钻头在页岩水平井钻井过程中的钻井效率和使用寿命。采用数值模拟方法,低雷诺数k-ԑ湍流模型,建立井底流场模型。对PDC(聚晶金刚石复合片)钻头的水力结构在不同钻井液排量、PDC钻头旋转速度和岩屑粒径工况下井底流场变化和岩屑运动状态进行分析。结果表明:随着排量的增加,岩屑效率逐渐提高。但在旋转工况下,钻井液排量和钻头转速的不匹配,降低了钻井液冲刷作用和岩屑运移效率。合适的排量和转速能有效提高岩屑的运移效率,减少井底岩屑堆积。在一定钻头转速和钻井液排量下,岩屑粒径大小与岩屑运移效率为正比例关系。研究结果能为优化PDC钻头的设计和钻井施工参数提供参考。Abstract: In order to reduce the difficulty of cuttings migration in horizontal wells, the problem of bit bagging. Improve the drilling efficiency and service life of PDC drill bit in the process of shale horizontal well drilling. The numerical simulation method and the low Reynolds number k-ԑ turbulence model are used to establish the bottom hole flow field model. The hydraulic structure of the PDC (polycrystalline diamond compact) bit is analyzed under the conditions of different drilling fluid displacement, PDC bit rotation speed and cuttings particle size. The results show that: with the increase of displacement, cuttings efficiency increases gradually. However, in the rotating condition, the mismatch between the drilling fluid displacement and the drill bit speed reduces the drilling fluid scour and cuttings migration efficiency. Appropriate displacement and rotational speed can effectively improve the cuttings migration efficiency and reduce the accumulation of cuttings at the bottom of the well. Under a certain bit rotation speed and drilling fluid displacement, the particle size of cuttings is directly proportional to the cuttings migration efficiency. The research results can provide reference for optimizing the design of PDC bit and drilling construction parameters.
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Key words:
- horizontal well /
- PDC bit /
- hydraulic structure /
- Downhole flow field /
- Simulation
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