J55膨胀套管在油气田开采环境中的CO_2腐蚀及其电化学行为  

Corrosion Behavior of J55 Expandable Casing in Oil and Gas Extraction Environment Involving Carbon Dioxide

作　　者：张仁勇[1,2] 王霞[3] 施岱艳[1,2] 廖芸[1,2] 陈勇彬[1,2] 上官昌淮[1,2] 

机构地区：[1]中国石油集团工程设计有限责任公司西南分公司,四川成都610041 [2]中国石油天然气集团公司石油管工程重点实验室酸性气田管材腐蚀与防护研究室,四川成都610041 [3]西南石油大学材料科学与工程学院,四川成都610500

出　　处：《材料保护》2013年第11期58-60,8,共3页Materials Protection

摘　　要：目前,对石油工业中常用的J55套管膨胀前后的CO2腐蚀规律研究不多。模拟油气田开采环境,采用经典失重法研究了J55套管的平均腐蚀速率及其电化学行为,分析了温度、CO2分压、Cl-浓度等因素对膨胀前后J55套管腐蚀速率的影响。结果表明:J55套管的平均腐蚀速率基本都随着采出液温度、CO2和Cl-浓度的升高而增加;当温度为90℃,CO2分压为2.0 MPa,Cl-浓度为42.83 g/L时,J55套管膨胀后的平均腐蚀速率最大达到4.183 9 mm/a,高于膨胀前的3.700 4 mm/a;膨胀前后J55套管的腐蚀产物均为FeCO3,其阻抗谱中出现了2个时间常数,膨胀后J55套管的腐蚀电流密度增加,腐蚀速率更快。The corrosion behavior of J55 casing materials in simulated oil and gas extraction environment were studied by classical weight-loss method. The effects of temperature,partial pressure of CO 2,and concentration of Cl-on corrosion rate of J55 casing materials before and after expansion were analyzed. Results showed that the average corrosion rate of J55 casing tended to rise with increasing temperature of the extracted fluid,partial pressure of CO 2,and Cl-concentration. At 90 ℃,CO 2 partial pressure of 2. 0 MPa,and Cl-concentration of 42. 83 g / L,the average corrosion rate of J55 casing after expansion reached the maximum of as much as 4. 183 9 mm / a, higher than 3. 700 4 mm / a before expansion. The corrosion product of J55 casing before and after expansion consisted of FeCO 3; and the electrochemical impedance spectra indicated that J55 casing materials before and after expansion had 2 time constants. Particularly,expanded J55 casing had increased corrosion current and higher corrosion rate.

关 键 词：CO2腐蚀 电化学行为 J55套管 膨胀 影响因素 腐蚀速率 腐蚀产物 

分 类 号：TG172[金属学及工艺—金属表面处理]