河流穿越管道冲刷裸露段安全评估方法  

Safety assessment method for exposed crossing pipelines caused by river scouring

作　　者：黄朝炜 罗叶新[1] 王松[1] HUANG Chaowei;LUO Yexin;WANG Song(China Petroleum Pipeline Engineering Co.Ltd.)

机构地区：[1]中国石油天然气管道工程有限公司,河北省065000

出　　处：《油气储运》2021年第8期867-873,共7页Oil & Gas Storage and Transportation

基　　金：中国石油科技创新基金研究项目“油气管道在线应力超声波测试技术研究”,2017D-5007-0605。

摘　　要：河流定向钻穿越管道受到洪水冲刷,可导致管道穿越段裸露于河床之上,甚至悬空,引起管道失效。研究管道在水动力作用下从开始裸露到发生疲劳破坏整个过程的破坏机理,从侧向稳定性、强度失效及悬跨疲劳分析3个层面,提出受冲刷裸露管道安全评估方法。利用该方法对两条实际管道进行安全评估,并提出了有针对性的解决方案,结果表明:实例1中受冲刷裸露管道的最大等效应力为176 MPa,小于管材的最小屈服强度,且未发生悬空,管道处于安全状态;实例2管道裸露期间,洪水对管道的冲刷时间超过了其疲劳寿命,管道无法继续运营。研究成果为受冲刷管道的安全评估与更换方案制定提供了理论支持与依据。Flood scouring the river bed where the directional drilling crossing pipeline is located may lead to pipeline exposure above the riverbed,as well as pipeline suspension and failure.The failure mechanism of pipeline during the whole process from initial exposure to fatigue failure under the action of hydrodynamic force was studied and the safety assessment method of the exposed pipeline due to scouring was proposed through the lateral stability,strength failure and suspended span fatigue analysis.In addition,safety assessment was performed for two actual pipelines with the solution was developed.The results indicate that the pipeline in Example 1 is in safe state for the maximum equivalent stress of the exposed pipeline is 176 MPa,which is less than the minimum yield strength of the pipeline,and there is no suspension.However,the pipeline in Example 2 cannot operate any more for the scouring time of flood on the pipeline exceeds its fatigue life during exposure.Thus,the research results provide theoretical support and basis for the safety assessment and the development of the replacement scheme of scoured pipelines.

关 键 词：管道 定向钻穿越 安全评估 河流 冲刷 水动力 破坏机理 

分 类 号：TE88[石油与天然气工程—油气储运工程]