基于ANSYS-LSDYNA的围压下粒子冲击破岩规律  

Study on rock breaking for particle impacting with confining pressure based on ANSYS-LSDYNA

作　　者：颜廷俊[1] 姜美旭[1] 张杨[1] 聂炳林[2] 

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]中国石化海上石油工程技术检测中心,山东东营257001

出　　处：《断块油气田》2012年第2期240-243,共4页Fault-Block Oil & Gas Field

基　　金：中石化先导项目"粒子冲击钻井技术前瞻性研究"(P10037)

摘　　要：粒子冲击钻井是一种以粒子冲击破岩为主的新型钻井技术,在仿真分析中岩石的围压作用对模拟岩石真实的受力状态和力学响应至关重要。利用ANSYS-LSDYNA具有的"隐式-显式"序列求解方法,将围压作用简化为岩石内部的预应力效应,分析了岩石在围压作用下的冲击损伤破坏演化过程,进一步研究了有、无围压作用下粒子不同速度冲击破岩的规律。仿真结果表明:有围压作用的岩石破碎体积明显小于无围压作用的岩石破碎体积;随粒子入射速度的增加,岩石的破碎体积呈线性增大。Particle impact drilling is a new drilling technology which is dominated by particle impacting. The problem of rock confining pressure is very significant to simulate real stress state and mechanic, al response of rock. Confining pressure was simplified as mck pre-stressing effect by ＂implicit-explicit＂ sequence solution of ANSYS. And, damage evolution process of impacting rock with confining pressure was analyzed. Farther, the law that single particle impacted and destrnyed rock witlv＇without confining pressure at different velocity was studied. Simulation resuhs indicated that the volumetric h＇acture of rock with confining pressure was obviously less than that without confining pressure. And the rock w）lumetric fracture was linearly increased with the increase of partMe incidence velocity.

关 键 词：围压 粒子冲击钻井 隐式显式分析 ANSYS 

分 类 号：TE21[石油与天然气工程—油气井工程]