气体钻井钻柱失效机理分析  

Drill-String Failure Mechanism in Gas Drilling

作　　者：邹海洋[1] 狄勤丰[1] 姚建林[1] 胡以宝[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：《石油钻探技术》2008年第3期55-58,共4页Petroleum Drilling Techniques

基　　金：国家自然科学基金项目"空气钻井直井易斜机理及其控制技术研究"(编号:50674065);上海市科委项目(编号:061658035);上海市重点学科建设项目(编号:Y0103);上海大学创新项目资助

摘　　要：川东北地区气体钻井中钻柱失效情况的统计资料表明,钻柱失效主要表现为磨损和断裂,分析可知,气体钻井时钻柱失效严重除与高速岩屑的冲蚀、井壁岩石的磨损、酸性介质环境的腐蚀有关外,还与钻柱承受更为复杂的动态应力密切相关。动力学分析结果表明,与钻井液钻井相比,气体钻井时钻柱的动态应力明显增大,动态应力的变化幅度和变化频率也明显提高,这是造成钻柱失效的主要原因之一。因此,防治气体钻井钻柱失效应切实重视钻柱动态应力的控制,目前条件下,加强钻柱的探伤工作,确保入井钻柱的抗疲劳破坏能力和使用减振工具是较为有效的预防钻柱失效的技术措施。Statistics of drill string failure d worn out and twisting off are the main reasons to the erosion of high-speed cuttings, the wear uring gas drilling in Northeast Sic for drill string failure. The drilling huan area indicate that string failure is related of borehole wall rock and the corrosion of acidic environment, and more complex dynamic stress in drill string. The dynamic analysis results show that the dynam- ic stress of drill-string, the increase in the amplitude and frequency of dynamic stress compared with fluid drilling are main reasons for drilling string failure. Therefore, in order to prevent drill string failure, the dynamic stress in drill string should he controlled in gas drilling. The detection of the drilling string damage, the assurance of drilling string＇s anti-failure capacity and the use of tool to reduce vibration are the main measures to prevent drilling string failure.

关 键 词：气体钻井 钻柱损坏 钻柱应力 动力学 

分 类 号：TE21[石油与天然气工程—油气井工程]