高温超临界CO2工况下气源纯度对油套管腐蚀行为的影响
Effect of Gas Purity on Corrosion Behavior of Tubing and Casing under High-Temperature Supercritical CO2 Condition
邢希金 1王贝 2谷林 1刘大康 3王修云 2张雷3
作者信息
- 1. 中海油研究总院,北京 100028
- 2. 安科工程技术研究院(北京)有限公司,北京 102209
- 3. 北京科技大学,北京 100083
- 折叠
摘要
为明确CO2 驱油过程中,CO2 气源纯度对管材服役性能的影响,采用高温高压反应釜模拟了高温超临界CO2 工况,对N80 及 13Cr油套管开展了腐蚀模拟试验,结合扫描电镜(SEM)、能谱(EDS)和X射线衍射(XRD)等方法对腐蚀产物膜进行了分析.结果表明:N80 及 13Cr试样在低纯度的CO2 中腐蚀更为严重,且 13Cr存在严重点蚀风险.其主要原因为高压下,低纯度的CO2 会使溶液中溶氧量上升并引发N80 及 13Cr发生严重的氧腐蚀.因此,在采用CO2 驱油技术时,应严格控制气源纯度.
Abstract
In order to clarify the influence of gas source purity on the service performance of pipes during CO2 oil recovery,high-temperature and high-pressure reaction vessels were used to conduct corrosion simulation tests on N80 and 13Cr oil casings under high-temperature and supercritical CO2 conditions with different purity CO2 gas sources.SEM,EDS,and XRD methods were combined to analyze the corrosion product film.The results show that the corrosion of N80 and 13Cr samples was more severe in low purity CO2 environment,and there was a serious risk of pitting of 13Cr.The main reason was that under high pressure condition,low purity CO2 would increase the amount of dissolved oxygen in the solution and cause serious oxygen corrosion of N80 and 13Cr.Therefore,when using CO2 oil recovery technology,the purity of the gas source should be strictly controlled.
关键词
超临界CO2/N80钢/13Cr钢/CO2腐蚀/氧腐蚀Key words
supercritical CO2/N80 steel/13Cr steel/CO2 corrosion/O2 corrosion引用本文复制引用
基金项目
国家重点研发计划(2022 YFB3707500)
出版年
2024
NETL
NSTL
万方数据