高压弯管冲蚀失效分析及数值模拟  

Failure Analysis and Numerical Simulation of High Pressure Elbow Erosion Wear

作　　者：张继信[1] 康健[1] 樊建春[2] 高建村[1] 

机构地区：[1]北京石油化工学院北京市安全生产工程技术研究院,北京102617 [2]中国石油大学(北京)机械与储运工程学院,北京102249

出　　处：《润滑与密封》2016年第10期40-46,共7页Lubrication Engineering

基　　金："十二五"国家科技重大专项(2011ZX05048);北京石油化工学院科技创新项目(15031862005/014)

摘　　要：油气田水力压裂作业时,高压管汇的弯头、三通等连接件部位由于承受上百兆帕的压力以及携砂液的高速冲蚀作用,应力集中及冲蚀破坏十分严重。对典型的高压管件失效样品进行失效分析,分析其宏观形貌特征和微观形貌特征。结果表明:压裂工况下高压弯头的主要失效模式为固体颗粒的小角度高速切削模式。对高压弯管冲蚀磨损进行数值模拟,得到高压管汇弯管内液相及固体粒子的流动规律,压力、速度变化规律以及冲蚀磨损的分布规律。数值模拟结果与现场回收的失效样品分析结果一致,验证了分析方法的正确性。During water pressure cracking operation, stresses concentration and erosion damage are very serious because of the pressure up to hundreds of MPa suffered by connection parts as elbow and three-way in high pressure pipe and the high speed erosion of sand carried fluid.The typical failure samples of high-pressure elbow were analyzed by macroscopic morphology and microstrueture analysis. The results show that the main failure model of high pressure elbow is of high speed cutting of solid particles at a small angle in the pipe under pressure cracking condition.Computational fluid dynamics （CFD） analysis was used to simulate the erosion wear in high pressure elbow.The flow law of liquid phase and solid particles in the pipe, and the distribution of the velocity, pressure and erosion wear were obtained.CFD simulation results are in consistency of that from analysis of collected failed samples in the field situation ,which validated the correctness of the analysis method.

关 键 词：高压管汇 冲蚀磨损 失效分析 数值模拟 

分 类 号：TG172[金属学及工艺—金属表面处理]