双金属复合管内衬层液固两相流冲蚀机理  

Erosion mechanism of liquid-solid two-phase flow at inner liner of bimetallic composite tube

作　　者：曹学文[1] 彭文山[1] 胥锟 樊茵 孙晓阳[1] 

机构地区：[1]中国石油大学(华东)储运与建筑工程学院

出　　处：《油气储运》2017年第6期739-746,共8页Oil & Gas Storage and Transportation

基　　金：国家重点研发计划专项"临海油气管道及陆上终端设施损伤机理与演化规律研究";2016YFC0802301;中央高校基本科研业务费专项资金资助项目"固体颗粒对液固两相流管道冲蚀的力学作用研究";15CX06070A

摘　　要：砂磨管道是油气田开发中的常见问题,持续不断的碰撞导致材料产生凹坑或者划痕,进而造成管道磨损减薄甚至泄漏等严重问题。管道内部流场多变、砂粒分布不均,导致砂粒冲蚀机理复杂。利用大型液固两相流冲蚀实验环道研究了双金属复合管内衬层316L不锈钢的冲蚀性能,并与数值计算结果进行对比分析,揭示复合管弯管部位的冲蚀机理,结果表明:(1)砂粒对弯管的冲蚀磨损主要包括微切削摩擦、犁割以及冲击变形3种形式;(2)弯管处二次流对于砂粒运动影响显著,二次流使得弯头处砂粒由外拱向内拱运动,造成内拱部分区域的冲蚀;(3)受重力及流场影响,冲蚀最严重部位出现在弯头出口处的底部。It is common during the development of oil and gas fields that pipelines suffer sand wear. Continuous impacts can cause dents or scratches on pipe materials, and lead to wall thinning and even other serious problems, e.g. pipe leakage. The flow field inside the pipeline is variable and the sand is not distributed uniformly, so sand erosion mechanism is complex. In this paper, the erosion performance of 316 L stainless steel at inner liner of bimetallic composite tube was studied by using the large liquid-solid two-phase flow erosion test loop, and the test results were compared with the numerical calculation results. Then, the erosion mechanism of the elbow of composite tube was proposed. It is shown that the sand wear and erosion on elbows is mainly divided into three forms, i.e., micro-cutting wear, plowing and impact deformation. The effect of secondary flow on sand movement at the elbow is significant. Due to secondary flow, the sand at the elbow moves from the extrados to the intrados and consequently the intrados zone is eroded. Under the effect of gravity and flow field, the most serious erosion occurs at the bottom of elbow outlet.

关 键 词：双金属复合管 316L 液固两相流 冲蚀 弯管 砂粒 

分 类 号：TE832[石油与天然气工程—油气储运工程]