复合冲击破岩数值模拟研究及现场应用

Numerical Simulation and Field Application Study on Rock-breaking in Compound Impact Drilling

为了探究复合冲击载荷作用下聚晶金刚石复合片钻头(PDC)的破岩机理,利用ABAQUS有限元软件建立了PDC单切削齿-岩石相互作用的数值模型,模拟研究了常规切削、单轴向冲击、复合冲击下岩石破碎过程,分析了复合冲击破岩机理。结果表明:在复合冲击作用下,轴向载荷分量能够增加切削齿切削深度,同时切向载荷分量的剪切作用使岩石产生大体积破裂。相比于常规钻进,应用复合冲击钻井后机械钻速提高了26.2%。研究成果可为复合冲击钻井技术的现场应用提供理论参考。

In order to explore the rock-breaking mechanism under compound impact load,the finite element model of single cutter-rock interaction was established by using ABAQUS.The rock breaking effect under conventional cutting,uniaxial impact,and compound impact was studied,and the mechanism of rock breaking was analyzed via numerical simulation.The results show that under the compound impact load,the axial load component can increase the depth of cutting,and the shearing action of the tangential load component causes the rock to generate large volume break.Field tests showed that the ROP of compound impact drilling is 26.2%higher than that of conventional rotary drilling.The research results can provide a theoretical basis for the field application of the compound impact drilling technology.