摘要
随着钻井深度不断增加,钻柱运动所涉及的力学问题变得更加复杂,钻柱动力学特性模拟及分析可为安全优质高效钻井提供支撑。为了探求特深井钻柱的运动特性,将钻柱运动的控制方程采用Newmark法对时间离散后,运用SOR节点迭代法,对每一时间步的钻柱整体构形进行求解,实现了总长超9000 m的钻柱动力学特性模拟,不仅给出了钻柱4个典型位置的涡动轨迹、涡动速度和横向加速度,还分析了钻柱的粘滑特性。分析结果表明,上部钻柱的涡动及粘滑现象不明显;随着位置下移,出现不规则涡动及不充分粘滑现象;近钻头位置的钻柱会出现较剧烈涡动,也会出现粘滑振动;中性点位置处钻柱的涡动最为剧烈、碰摩严重,可能给钻柱带来安全隐患。研究结果为特深井安全钻井提供了理论依据。
As drilling depths increase,the mechanical problems involved in drilling string motion become more complicated.The simulation and analysis of dynamic characteristics of drilling strings could contribute to safe,highquality,and efficient drilling.In order to explore the motion characteristics of drilling strings in extra-deep wells,the governing equation of drilling string motion was time-discretized using the Newmark method,and the successive overrelaxation(SOR)node iteration method was used to solve the entire configuration of the drilling string at each time step.The dynamic characteristics of the drilling string with a total length of over 9000 m were simulated.The whirl trajectory,whirl velocity,and lateral acceleration of the drilling string at four typical positions were given.The whirl and stick-slip characteristics of the drilling string were also analyzed.The results demonstrate that the whirl and stickslip phenomena in the upper part of the drilling string are not obvious and that as the position moves down,irregular whirl and insufficient stick-slip phenomena appear,and the drilling string near the bit may experience violent whirl and stick-slip vibration.The drilling string near the neutral point has the most violent whirls and serious friction,which may bring potential safety risks to the drilling string.The research results can provide theoretical basis for the safe drilling of extra-deep wells.
作者
狄勤丰
尤明铭
李田心
周星
杨赫源
王文昌
DI Qinfeng;YOU Mingming;LI Tianxin;ZHOU Xing;YANG Heyuan;WANG Wenchang(School of Mechanics and Engineering Science,Shanghai University,ShangHai 200444)
出处
《石油钻探技术》
CAS
CSCD
北大核心
2024年第2期108-117,共10页
Petroleum Drilling Techniques
基金
国家自然科学基金面上项目“考虑隔水管耦合作用的超深水超深曲井钻柱动力学研究”(编号:52174003)
国家自然科学基金石油化工联合基金重点项目“超深井钻柱非线性动力学及动态安全性基础理论研究”(编号:U1663205)
国家自然科学基金面上项目“特深井‘钛–钢’复合钻柱动态安全性及异型材质接头失效机理研究”(编号:52374008)资助。
关键词
特深井
钻柱动力学
SOR节点迭代法
涡动
粘滑
extra-deep well
drill string dynamics
SOR node iteration method
whirl
stick-slip
