水平定向钻在崖城13-1高栏支线管道中的应用

Horizontal directional drilling application in the branchpipeline of YC 13-1 trunkline

由于定向钻施工完成后,无法现场对已穿越管道进行修复施工,需在设计和施工阶段确保穿越管道的完整性,正确的设计和施工要考虑地层稳定性、选取适宜的穿越路由、安装过程中管道所受荷载控制等因素。崖城13-1高栏支线登岸管道采用陆对海定向钻铺设,陆对海穿越登岸方案、穿越路由设计、回拖力计算、铺管船就位位置、出土点后管道稳定性、出土点悬跨等是确保穿越管道完整性的关键问题。通过对以上问题的定性和计算分析,验证了登岸穿越管道的完整性,可供类似工程参考。

The pipeline integrity of pipelines installed by horizontal directional drilling(HDD)shall be assured during design and installation as in-situ repair of any damage on that section is not possible.Correct design and installation of this crossing design shall take into account formation stability,selection of appropriate drilling route,load control during pull-back and other relevant factors.The installation of shore approach section of Gaolan branch pipeline of Yacheng 13-1 trunkline adopted land-to-sea horizontal directional drilling approach.Land-to-sea drilling plan,pipeline crossing routing design,calculation of pull-back force,pipe laying barge positioning,on-bottom stability and free span of pipeline after exit point are the key issues for assurance of the pipeline integrity.Finally,the pipeline integrity is verified through qualitative and computational analysis on the key issues above.The presentation in this paper can provide reference for other projects of the same nature.