Fang Tiancheng, Ren Fushen, Wang Baojin, Cheng Jianxun, Liu Hanxu
Northeast Petroleum University, Daqing, Heilongjiang, China.
PLoS One. 2021 Apr 28;16(4):e0250588. doi: 10.1371/journal.pone.0250588. eCollection 2021.
Aimed at the technical problems of low drilling speed and difficult rock-breaking in deep-well and hard rock-stratum, particle waterjet coupled impact rock-breaking technology in rotary drilling is put forward in this paper. Firstly, the working principle of particle jet impact rock-breaking in rotary drilling was introduced, and the acceleration model of particle jet and the damage model of rock were established. The acceleration mechanism of particles and dynamic damage evolution process of rock under particle jet were studied, which showed that the broken pit and rock damage would increase with time gone on, and damage evolution of rock presented the radial expansion. Then, experimental device of particle jet coupled impact rock-breaking in rotary state was developed, and the effect of jet parameters on penetration depth and failure volume was analyzed with comparison of la experiment and numerical simulation. The results showed that drilling speed with particle jet impact is twice that of conventional drilling, and combination nozzles layout of impact angle with 8°and 20° can achieve rock-drilled rapidly, which also demonstrated the correctness of simulation method. The device development and the rock-breaking results analysis would be of great value for engineering application.
针对深井硬岩地层钻进速度低、破岩困难等技术问题，提出了旋转钻进中颗粒水射流耦合冲击破岩技术。首先，介绍了旋转钻进中颗粒射流冲击破岩的工作原理，建立了颗粒射流的加速模型和岩石的损伤模型。研究了颗粒射流作用下颗粒的加速机理和岩石的动态损伤演化过程，结果表明，随着时间的推移，破碎坑和岩石损伤会增加，岩石损伤演化呈现径向扩展。然后，研制了旋转状态下颗粒射流耦合冲击破岩实验装置，通过实验与数值模拟对比，分析了射流参数对钻进深度和破岩体积的影响。结果表明，颗粒射流冲击钻进速度是常规钻进的两倍，冲击角为8°和20°的组合喷嘴布局能实现快速破岩，同时也验证了模拟方法的正确性。该装置的研制及破岩结果分析对工程应用具有重要价值。
