【摘要】 采用Ansys Workbench有限元分析软件模拟316L不锈钢液控管线在200～350℃下的热应力分布,结合高温腐蚀模拟试验,研究了稠油热采服役环境下液控管线的应力腐蚀行为。结果表明:模拟得到液控管线在200～350℃温度范围内的最大热应力出现在接近油管接箍侧区域,其数值随温度的升高而增大。高温腐蚀模拟后,应力加载状态下液控管线的受拉伸区域出现多条径向裂纹,而无应力加载状态下局部位置存在点蚀坑。液控管线在稠油热采环境中的失效机理是在热应力和腐蚀介质共同作用下,点蚀坑处发生阳极溶解并发展为应力腐蚀裂纹。更多还原

【Abstract】 Thermal stress distribution of 316L stainless steel hydraulic control pipeline at 200-350 ℃ was simulated by finite element analysis software Ansys Workbench.And then combining with the results of high temperature corrosion simulation test,the stress corrosion behavior of the hydraulic control pipeline was studied in heavy oil thermal recovery service environment.The results show that the maximum thermal stress of the hydraulic control pipeline in the temperature range of 200-350 ℃ appeared in the area close to the tubing coupling side,and its value increased with increasing temperature.Several radial cracks existed in the tensile area of the hydraulic control pipeline under stress loading condition,and some pittings were observed in the local area under non-stress loading condition.The failure mechanism of hydraulic control pipeline in the heavy oil thermal recovery service environment was that anodic dissolution occurred at pittings and then stress corrosion cracks were initiated under combination of thermal stresses and corrosive mediums.更多还原