南海超深水取样钻柱纵向粘滑振动分析  

Analysis on Longitudinal Stick-slip Vibration of Ultra-deep Water Drillstring

作　　者：高光海[1] 仇性启[1] 董辉[1] 许俊良 任红 

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580 [2]中石化胜利石油工程有限公司钻井工艺研究院,山东东营257017

出　　处：《石油矿场机械》2016年第11期8-13,共6页Oil Field Equipment

基　　金：国家高技术研究发展计划(863计划)课题"天然气水合物钻探取芯工程样机及配套技术"(2013AA092602);中央高校基本科研业务费专项资金资助项目(16CX06015A)

摘　　要：针对南海超深水天然气水合物取样钻柱纵向粘滑振动问题,推导了纵向振动微分方程,采用非线性弹簧单元模拟了钻柱与岩层之间的粘滑摩擦。通过数值求解得到了钻柱纵向振动频率及振动位移,探讨了钻压、钻铤长度及作业水深对钻柱纵向振动的影响。结果表明：钻柱低阶振动频率所对应外载激励周期为1.5~4.0s,接近南海波浪运动周期,钻柱发生低阶共振几率较大;钻压的增加,使得钻柱振动位移减小;钻铤长度及作业水深的增加使得钻柱振动频率减小、振动位移增加,南海环境下钻柱更易发生低阶共振;钻柱发生1阶共振时振动位移约为近频率振动位移的8倍,共振危害程度较大。Based on the longitudinal stick-slip vibration of the drillstring in South China Sea,the differential equation of the longitudinal vibration was deduced.The stick-slip friction of the drillstring and rock was simulated through nonlinear spring unit.The vibration frequency and displacement were obtained by using numerical simulation method.The effects of drilling pressure,the length of the drill collar and the depth of water were also discussed in the paper.According to the results,the period of the external load excitation which corresponding to the low-level vibration frequencies of the drillstring is 1.5~4.0s.The period is close to the period of the wave in south sea of China.The probability of the resonance of the drillstring is large.The vibration displacements decrease owing to the increase of the drilling pressure.The vibration frequencies decrease and the vibration displacements increase owing to the increase of the length of the drill collar and water depth.The resonance displacement is nearly 8times to the displacement of normal vibration.

关 键 词：超深水 钻柱 纵向粘滑振动 振动频率 振动位移 

分 类 号：TE952[石油与天然气工程—石油机械设备]