单粒子冲击破岩实验与数值模拟

The experimental study and numerical simulation of single-particle impacting rock

粒子冲击破岩可提高深井、超深井硬地层的钻井速度。通过破岩实验与数值模拟相结合的方法,以冲击破岩的粒子直径、冲击速度等与岩石破碎体积和粒子最大侵彻深度(岩石破碎坑最大深度)之间的内在规律研究为目的,进行了单粒子冲击破岩室内实验,分析了破碎坑模式。同时,利用有限元软件建立了粒子冲击破岩的物理模型,并对粒子冲击破岩的过程进行了数值模拟。模拟结果与室内实验数据的对比,验证了H-J-C模型选取的正确性,并得到了粒子冲击破岩的最佳直径和初速度值的范围。

The drilling speed of deep wells in hard formations could be improved by the particle impact drilling technology.A single particle impacting rock test was made to investigate how the diameter and impacting velocity of particles influence the breaking rock volume and maximum depth of craters.We analyzed different patterns of crushed craters in experiments associated with numerical simulation,and developed a physical model of particle impacting rock using the finite element analysis（FEA） software.In addition,we numerically simulated the process of particle impacting rock and contrasted the simulation results with lab data,which confirmed the validity of the H-J-C model.The result shows that the model can lead to an optimized arrangement of diameter and impacting speed as well,which is of guiding significance in technique improvement of particle impact drilling.