摘要
在水平定向钻孔管道穿越施工时，需要适当增大扩孔直径来减小管道所受约束，这就要求确定合理的孔-管直径比。选取钻孔出土弯曲段作为研究对象，利用有限元仿真计算不同孔-管直径比条件下的管道应力分布以及回拖力变化，分析孔-管直径比最优选择。计算结果表明，孔-管直径比大于1．4时，管道最大应力值明显下降；孔-管直径比超过1．5时，管道最大应力趋于平稳。回拖载荷随孔-管直径比的增大而减小，且在孔-管直径比达到1．4后降幅逐渐减小，此时孔-管直径比对回拖载荷的影响减弱。综合考虑，孔-管直径比在1．4～1．5之间为最优。
Borehole reaming is often required to reduce the pipeline constraints when running pipeline through horizontal direetional borehole. Therefore, a reasonable borehole-pipeline diameter ratio needs to be deter- mined. Taking the unearthed curved section as the research object, the pipeline stress distribution and pullback force under different borehole-pipeline diameter ratio are calculated using the finite element simulation. The opti- mized borehole-pipeline diameter ratio is also analyzed. The calculation results show that, the pipeline maximum stress decreases significantly when the borehole-pipeline diameter ratio is greater than 1.4, and will become steady when the ratio exceed 1.5. The pullback load decreases with the increase of borehole-pipeline diameter ratio and the decreasing amplitude gradually decline as the ratio reaches 1.4. Meanwhile, the effect of borehole-pipeline diameter ratio on the pullback load weakened. As a result of overall consideration, 1.4 to 1.5 are the optimized borehole- pipeline diameter ratio.
出处
《石油机械》
北大核心
2014年第10期107-110,116,共5页
China Petroleum Machinery
基金
中石油管道建设课题"特殊地区管道建设关键技术研究"(2011B-3303)
关键词
水平定向钻
管道穿越
孔一管直径比
应力分布
回拖力
有限元分析
horizontal directional drilling
borehole-pipeline diameter ratio
stress distribution
pullbackforce
finite element analysis
