牙轮钻头单牙轮的破岩仿真研究  

Non-limear dynamic analysis of a roller cone bit-well rock system with rock-cone bit interaction

作　　者：王清峰[1] 朱才朝[1] 宋朝省[1] 陆波[1] 冯代辉[2] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400030 [2]中冶赛迪工程技术股份有限公司,重庆400013

出　　处：《振动与冲击》2010年第10期108-112,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(90410004);新世纪优秀人才计划(NCET-05-0766)资助项目

摘　　要：牙轮钻头在井底破碎岩石过程中受顶部钻压、自身动载荷以及井底接触岩石的随机冲击碰撞作用,存在牙齿与岩石交替压入、刮切和滚动的运动状态,受力情况相当复杂。基于岩石弹塑性本构关系和等效塑性应变的岩石破坏准则,考虑井底围压以及钻头与岩石互作用随机接触碰撞,采用有限单元法建立了牙轮钻头与井底岩石互作用下系统非线性动力学模型。探讨了牙轮钻头在破碎井底岩石过程中的运动规律及力学性能,对岩石破碎坑的形成过程进行了仿真,为有效预测和控制井眼轨迹的形成,实态工况下整体钻柱系统耦合非线性动力学研究提供了理论依据。In the process of rock-crushing on bottom of hole,the effects of drilling pressure,self dynamic loads,random impacts and contacts between cone bit and rock on a roller cone bit system were considered.With alternating press-in,scraping and rolling,the motion state and the stress of the cone bit were extraordinarily complex.Based on plastoelastic constitutive equations of rock and equivalent plastic strain damage principle,considering the confining pressure and random interaction loads between bit and rock,a nonlinear dynamic model of the roller cone bit-bottom rock system was set up using FEM method.Kinematics law and mechanical property of the roller cone bit system were discussed.Also the formation process of craters on the rock was stated here.The research results laid down a theoretical basis for forecasting the formation of hole trajectory,and developing nonlinear dynamic theory of a drill string system coupled vibration in the actual work condition.

关 键 词：牙轮钻头 随机碰撞 破岩 井底模式 有限元 动态特性 

分 类 号：TD421[矿业工程—矿山机电]