振荡冲击器破岩机理数值模拟分析  

Numerical Simulation Analysis of Rock Breaking Mechanism for Oscillation Impacter

作　　者：董学成[1,2] 熊继有[1,2] 王国华[1,2] 秦大伟[1,2] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学,四川成都610500 [2]西南石油大学石油与天然气工程学院,四川成都610500

出　　处：《西南石油大学学报（自然科学版）》2014年第6期160-167,共8页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：为了揭示振荡冲击器作用下的井底岩石破碎机理,用数值模拟分析的方法,研究了不同参数对破岩效率的影响,包括不同工作频率、不同循环动载和不同岩石类型,并分别对其进行了定量分析。结果表明,井底岩石的破碎分为3个区域:破碎区,损伤区和无损区,在振荡冲击器的作用下,井底岩石的破碎过程分为3个阶段:钻头的中心齿压碎岩石,边齿对岩石造成破坏,钻头旋转切削破碎岩石。井底岩石的破碎效率随着振荡冲击器工作频率的变化而变化,当工具的工作频率为16 Hz时,破岩效率最高,振荡冲击器的破岩效率随着交变动载荷峰值的增加而不断增加,当其峰值载荷超过10 k N之后,破岩效率增加比较缓慢,振荡冲击器的破岩效率随着地层岩石硬度的变化而变化。这对振荡冲击器的现场应用具有十分重要的指导意义。A model was built to simulate the process of rock breaking,under the action of oscillation impacter.In this model, influences of different parameters on rock breaking efficiency were considered.Moreover,a quantitative analysis was proposed for different parameters,such as different frequencies,different cyclic dynamic loads and different kinds of rocks.Through the modelling and simulation using ABAQUS/Explicit,rock breaking efficiency was investigated in detail.The results indicate that the connected face of rock and bit appears in three distinct zones：the broken zone,damage zone and undamaged zone. Rock breaking process can be divided into three stages：center cutters of bit crushing rock,surrounding cutters of bit crush rock and rotary cutting.When the frequency is about 16 Hz,rock breaking efficiency gets the maximum value.Along with the increase of dynamic load,the depth of broken pit increased,when the dynamic load was larger than 10 kN,the rising trend of rock breaking efficiency slowed down.Different rock had different rock breaking efficiency.It is very helpful to the field application.

关 键 词：数值模拟 动态载荷 工作频率 破岩机理 破岩效率 

分 类 号：TE938[石油与天然气工程—石油机械设备]