热采筛管冲蚀与腐蚀迭加作用机理

 利用高温高压反应釜进行冲蚀、腐蚀和冲蚀腐蚀迭加3 种条件下的多元热流体稠油热采防砂筛管损坏模拟实验，采用失重法获得3 种条件下筛管挡砂介质的腐蚀速率，434 金属棉在迭加条件下的腐蚀速率较纯冲蚀条件下提高了75 倍，较纯腐蚀条件下也提高了53%。采用宏观观察、扫描电子显微镜（SEM）、能谱仪（EDS）等方法对腐蚀试样进行宏微观分析，发现迭加条件下材质腐蚀程度均比单一条件下显著。结果表明，在迭加作用下筛管材质的腐蚀速率显著高于单纯冲蚀和单纯腐蚀条件。腐蚀作用对机体的损伤以及冲蚀作用对腐蚀保护膜的破坏两方面相互促进，导致筛管材质损伤程度的增加。

Erosion and Corrosion Superposition Mechanism of Thermal Screen

Failure simulation experiments of multiple thermal fluid recovery sand control screen were firstly carried out in erosion, corrosion and erosion-corrosion superposition conditions. The experiments were carried out in high temperature and high pressure reaction still. The corrosion rates of screen block sand medium were respectively observed in three conditions by weight loss method, the corrosion rate of 434 material in superposition condition is 75 times higher than that in erosion condition and is 53% higher than that in corrosion condition. Macroscopic and microscopic analysis were carried out by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Results showed that corrosion rates in superposition conditions were observably higher than those in single erosion and single corrosion conditions. The destructive effect of corrosion to organism and erosion to corrosion protective film promote mutually, which leads to the increase of damage degree.