海底输油管道后深挖沟11.9m的实践分析  

A Case Study of Post-trenching in Depth of 11.9m for Subsea Oil Pipelines

作　　者：周彬 刘彬杰 董治国 肖守峰 耿焘 ZHOU Bin;LIU Binjie;DONG Zhiguo;XIAO Shoufeng;GENG Tao(Hilong Petroleum Offshore Engineering Company Limited,Shanghai 201010,China)

机构地区：[1]海隆石油海洋工程有限公司,上海201107

出　　处：《海洋石油》2022年第4期101-106,共6页Offshore Oil

摘　　要：在孟加拉湾海域,4条近似平行的海底输油管道需要穿越两条平行航道,宽度约1.2 km。通过采用铺设管道并进行后挖沟的方法,实施平均20遍的挖沟,将4条海底输油管道埋设至航道疏浚要求的标高之下,最大挖沟深度达到11.9 m。对制定方案过程中的要点难点以及实施各阶段存在的挑战,通过多种技术评估,使用具有排泥功能的窄高型挖沟机,作业期间综合利用SBP(浅地层剖面系统调查)和3D声纳(三维声纳实时成像系统)调查,挖沟后对海底输油管道进行完整性和安全性的总体评估,成功完成了海底输油管道铺设后的超常规深度的后挖沟,最终的调查和评估结果显示后挖沟作业达到了设计要求并保障了管道的完整性。实践证明通过综合的技术措施使用水力喷射式后挖沟机可以成功实施海底管道后深挖沟。In the bay of Bengal,there are 4 nearly paralleled subsea oil pipelines to go across 2 paralleled channels with the breadth approximate to 1.2 km.By using the method of pipeline laying and post-trenching,trenching is carried out for an average of 20times,and 4 submarine oil pipelines are buried below the elevation required by waterway dredging,where the maximum trenching depth could achieve 11.9 m.With respect to difficulties in the plan process and challenges in each stage,by various of technical evaluation,narrow deep trenching machine with air lift eduction is utilized,combined use of SBP and 3D Sonar Survey during trenching operation,pipeline safety and integrity is analyzed after trenching.The final investigation and evaluation results show that the post-trenching operation meets the design requirements and ensures the integrity of the pipeline.Practice has proved that water jetting trencher can be utilized for post-deep trenching combined with comprehensive technical measures.

关 键 词：海洋工程 海底输油管道 后深挖沟 实践分析 

分 类 号：TE54[石油与天然气工程—油气田开发工程]