CO_(2)在模拟油田采出井环境中对P110钢腐蚀行为的影响  

Effect of CO_(2) on Corrosion Behavior of P110 Steel in Simulated Oilfield Production Well Environment

作　　者：万家瑰[1] 范振忠 WAN Jiagui;FAN Zhenzhong(College of Mechanical Science and Engineering,Northeast Petroleum University,Daqing Heilongjiang 163318,China)

机构地区：[1]东北石油大学机械科学与工程学院,黑龙江大庆163318

出　　处：《当代化工》2024年第9期2109-2112,2118,共5页Contemporary Chemical Industry

基　　金：黑龙江省自然科学基金项目(项目编号:LH2020E014)。

摘　　要：模拟油田CO_(2)采出井腐蚀环境,对油井套管钢P110钢进行了高温高压腐蚀实验,采用失重法测定了腐蚀速率,采用SEM、EDS和XRD观察分析了腐蚀产物的表面形貌及化学组成。结果表明:气相环境中,P110钢的腐蚀速率随温度和CO_(2)分压的升高而增大;液相环境中,P110钢的腐蚀速率在80℃时最大,可达3.7182 mm·a^(-1),温度高于90℃,腐蚀速率随温度升高而降低。CO_(2)分压小于1 MPa,P110钢的腐蚀速率随分压升高迅速增大,CO_(2)分压大于1 MPa腐蚀速率则缓慢增大。腐蚀产物的主要成分是FeCO_(3)及少量的铁锈,在高温时腐蚀产物膜对金属具有一定的保护作用。Under simulated corrosion environment of CO_(2) production wells in oilfields,high-temperature and high-pressure corrosion experiments were carried out on P110 steel casing steel for oil wells.The corrosion rate was measured by weight loss method.The surface morphology and chemical composition of the corrosion products were observed by SEM,EDS and XRD.The results showed that the corrosion rate of P110 steel increased with the rise of temperature and CO_(2) partial pressure in the gas phase environment.While in the liquid phase environment,the corrosion rate of P110 steel reached the maximum at 80℃,which was 3.7182 mm∙a^(-1),and then decreased with the temperature higher than 90℃.When the partial pressure of CO_(2) was less than 1 MPa,the corrosion rate of P110 steel increased rapidly with the rise of the partial pressure.In contrast,it increased slowly when the partial pressure of CO_(2) was higher than 1 MPa.The main components of corrosion products were FeCO_(3) and a small amount of rust.At high temperatures,the corrosion product film had a certain protective effect on the metal.

关 键 词：P110钢 CO_(2)腐蚀 温度 分压 腐蚀速率 

分 类 号：TQ050.91[化学工程] TG172.82[金属学及工艺—金属表面处理]