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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。
Sand grinding pipe is a common problem in the development of oil and gas fields. Continued collision leads to pitting or scratching of the material, leading to serious problems such as thinning and even pipeline leakage. The flow field inside the pipe is variable and the sand is unevenly distributed, resulting in complicated sand erosion mechanism. The erosion behavior of 316L stainless steel with bimetallic composite pipe inner liner was studied by means of a large liquid-solid two-phase flow erosion test circuit. The erosion performance of the composite pipe bending part was revealed by comparison with the numerical calculation results. (2) The secondary flow at the elbow has a significant effect on the sand movement, the secondary flow makes the elbow at the sand The arch moves inwardly, resulting in the erosion of the part of the arch; (3) the most serious part of the erosion appears at the bottom of the elbow exit due to gravity and flow field.