空气钻井斜直井眼中钻柱的动力学特性及失效机理  

Dynamic characteristics and failure mechanism of drill string in straight hole with air drilling

作　　者：姚建林[1] 狄勤丰[1] 胡以宝[1] 邹海洋[1] 

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072

出　　处：《中国石油大学学报（自然科学版）》2008年第3期63-67,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(50674065);上海市科委项目(061658035);上海市重点学科建设项目(Y0103)

摘　　要：钻柱涡动是钻柱失效的主要原因之一。应用有限元方法,仿真了空气钻井时斜直井眼中带牙轮钻头钻柱的动力学特性,比较了空气钻井和钻井液钻井条件下钻柱的涡动、变形以及动态应力状况,探讨了空气钻井钻柱失效的动力学机理。结果表明,钻柱在不同时刻的动态应力与静力学条件下计算的结果有宏观上的一致性,空气钻井时钻柱的应力波动较钻井液钻井的要大,钻柱涡动更加频繁。The whirl is the main reason of drill string failure. Applying finite element method, the dynamic characteristics of drill string with cone bit in straight hole were simulated, and the whirl, deformation and the dynamic stress in air drilling were compared with the ones in drilling fluid drilling. In addition, the dynamic mechanism of drill string failure in air drilling was discussed. The results show that there is a consistency of the variations for stress of drill string in general between dynamic and static, but stress fluctuation of drill string in air drilling is much larger and the whirl is much more frequent than the ones in drilling fluid drilling.

关 键 词：空气钻井 钻井液钻井 动力学特性 疲劳失效 钻柱 涡动 

分 类 号：TE21[石油与天然气工程—油气井工程]