超深水NGH无隔水管取样钻柱非线性静力学分析  

Nonlinear Static Analysis of Riserless Sampling Drill String in Ultra-deepwater of South China Sea

作　　者：高光海[1] 仇性启[1] 董辉[1] 许俊良 韩来聚 

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

出　　处：《石油机械》2017年第1期43-47,52,共6页China Petroleum Machinery

基　　金：国家863计划项目"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：绳索式钻探取样系统取样过程中,钻柱受到海流、波浪、岩土、钻井船漂浮及其他载荷因素的影响,其静态特性非常复杂,具有几何非线性与接触非线性的特点。鉴于此,考虑海洋环境载荷及海底岩土等对取样钻柱的作用,建立了完整的取样钻柱力学分析模型,研究取样钻柱非线性静力学特性,分析不同外界因素对取样钻柱静力学特性的影响规律。分析结果表明:超深水天然气水合物取样钻柱等效应力和最大弯矩均位于钻柱顶部迎流处,钻柱的最大弯曲变形发生在其顶端1/3偏下位置;海流流速、拖曳力系数及作业水深的增加均使得钻柱弯矩和弯曲变形增大。研究结果可为无隔水管取样钻柱的受力分析和现场施工提供参考。With the load effects of current,wave,soil,drifting of drill ship during the sampling drilling process,the rope type drill string has very complex static characteristics featuring geometric nonlinearity and contact nonlinearity. Taking into account the effects of marine environmental loads and seabed soils on the sampling drill string,a complete mechanical model of the drill string has been established to study the nonlinear static mechanics characteristics of the sampling drill string,and the effects of different external factors on the static mechanics characteristics of the drill string. The results show that the equivalent stress and maximum bending moment of the drill string are located at the incident flow at the top of the drill string for ultra deepwater gas hydrate sampling. The maximum bending deformation of the drill string occurs under the 1/3 of the top of the drill string. The flow velocity,drag coefficient and operating water depth would increase the bending moment and bending deformation of drill string. The conclusions could provide references for the force analysis and the operation of the riserless drill string.

关 键 词：取样钻柱 非线性分析 海流流速 拖曳力系数 静力学 等效应力 

分 类 号：TE951[石油与天然气工程—石油机械设备]