含CO2高温蒸汽环境中低合金钢耐腐蚀性能评价  

Evaluation of corrosion resistance for low alloy steels in high temperature steam environment with CO_2

作　　者：邬元月 石善志 黄建波 于会永 董宝军[2] 曾德智[2] 

机构地区：[1]中国石油新疆油田分公司工程技术研究院 [2]西南石油大学油气藏地质及开发工程国家重点实验室

出　　处：《石油与天然气化工》2017年第4期77-81,共5页Chemical engineering of oil & gas

基　　金：国家自然科学基金资助项目“腐蚀与脉动冲击载荷共同作用下超高强度钻具疲劳损伤行为与控制机制研究”(51374177)

摘　　要：利用高温高压釜模拟CO_2辅助蒸汽驱注气井筒工况,在CO_2分压为2 MPa,温度为160~220℃条件下,对低合金钢进行了失重挂片腐蚀试验,得到了不同温度条件下管材的腐蚀速率,并利用扫描电镜和能谱仪观测管材在不同温度条件下的腐蚀形貌及产物组成。实验结果表明:在160~220℃范围内,随着温度的升高,低合金钢的腐蚀速率呈现先降低后增大的变化趋势,且均在160℃时腐蚀速率最高;在实验条件下,两种低合金碳钢的均匀腐蚀速率均小于油田控制指标0.076mm/a,满足注气井井筒管柱的腐蚀控制要求。By simulating the environment of CO2 auxiliary steam with HTHP autoclave, the corrosion behavior of low alloy steels was studied under 160-220 ℃ and 2 MPa partial pressure, and the corrosion rate was measured by the weight loss method. The morphology and composition of the corrosion product under different temperature were analyzed by SEM and EDS. The results showed that the average corrosion rate of N80 and 3Cr steels appeared as a deep ‘V’ shape. The corrosion of N80 and 3Cr steel reached the maximum when the temperature was 160 ℃. Under the test conditions, the uniform corrosion rates of two low alloy steels were less than the control target of oil field （0.076 mm/a）, and both met the demand of gas injection well.

关 键 词：蒸汽驱 CO2腐蚀 温度 油套管钢 腐蚀速率  

分 类 号：TE983[石油与天然气工程—石油机械设备]