TP110TS和P110钢在CO<sub>2</sub>注入井环空环境中应力腐蚀行为比较

doi:10.11902/1005.4537.2019.126

中国腐蚀与防护学报

2020, Vol. 40

Issue (4): 302-308 DOI: 10.11902/1005.4537.2019.126

研究报告

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TP110TS和P110钢在CO₂注入井环空环境中应力腐蚀行为比较

李清¹^,², 张德平¹^,², 李晓荣³, 王薇⁴, 孙宝壮⁵(

), 艾池¹(

)

1.东北石油大学油气井工程学院大庆 163318
2.中国石油吉林油田公司二氧化碳开发公司松原 138000
3.天津大港油田集团工程建设有限责任公司天津 300280
4.中国石油吉林油田分公司油气工程研究院松原 138000
5.北京科技大学腐蚀与防护中心北京 100083

Comparison of Stress Corrosion Behavior of TP110TS and P110 Steel in a Simulated Annular Environment of CO₂ Injection Well

LI Qing¹^,², ZHANG Deping¹^,², LI Xiaorong³, WANG Wei⁴, SUN Baozhuang⁵(

), AI Chi¹(

)

1. Northeast Petroleum University Oil and Gas Well Engineering College, Daqing 163318, China
2. Carbon Dioxide Development Company, Jilin Oil Field Company, Songyuan 138000, China
3. Tianjin Dagang Oilfield Group Engineering Construction Co. Ltd. , Tianjin 300280, China
4. Oil and Gas Engineering Research Institute, PetroChina Jilin Oilfield Company, Songyuan 138000, China
5. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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摘要:

利用U形弯试样浸泡实验和电化学测试技术研究了两种油套管钢在CO₂注入井环空环境中的应力腐蚀开裂行为。结果表明，TP110TS钢和P110钢在注入井环空环境 (大量CO₂-微量H₂S) 下存在一定的应力腐蚀敏感性，其应力腐蚀机制为阳极溶解和氢脆协同作用机制。在CO₂-H₂S环境下，咪唑啉类缓蚀剂的浓度对TP110TS和P110油套管钢的应力腐蚀产生不同的影响，添加足量的缓蚀剂对P110钢的应力腐蚀行为产生较好的抑制效果；但当添加量不足时，缓蚀剂会增加P110钢发生应力腐蚀的倾向性。而TP110TS钢的应力腐蚀敏感性随着缓蚀剂浓度的增加而减小，相对更适用于添加缓蚀剂的CO₂-H₂S环境。

关键词 ： TP110TS钢, P110钢, 环空环境, 应力腐蚀, CO₂注入井

Abstract：

The stress corrosion cracking behavior of two oil casing steels TP110TS and P110 in a simulated solution in the annulus space of CO₂ injection wells was comparatively studied by U-bend specimen immersion test and electrochemical test. The results show that TP110TS steel and P110 steel have certain degree of stress corrosion sensitivity in the solution (large amount of CO₂ and micro H₂S), and the stress corrosion mechanism is the synergistic mechanism of anodic dissolution (AD) and hydrogen embrittlement (HE). In the CO₂-H₂S environment, the concentration of imidazoline corrosion inhibitor has different effect on the stress corrosion of oil casing steels TP110TS and P110. Adding sufficient corrosion inhibitor has a good inhibitory effect on the stress corrosion behavior of P110 steel. However, when the added amount is insufficient, the corrosion inhibitor increases the stress corrosion tendency of P110 steel. The stress corrosion sensitivity of TP110TS steel decreases with the increase of corrosion inhibitor concentration. It follows that TP110TS is more suitable for the CO₂-H₂S environment where corrosion inhibitors are added.

Key words： TP110TS steel P110 steel annulus environment stress corrosion CO₂ injection well

收稿日期: 2019-08-23

ZTFLH:

TG174.42

基金资助:国家科技油气重大专项(2016ZX05016002)

通讯作者: 孙宝壮,艾池 E-mail: sunbaoz9406@163.com;aichi2001@163.com

Corresponding author: SUN Baozhuang,AI Chi E-mail: sunbaoz9406@163.com;aichi2001@163.com

作者简介: 李清，男，1983年生，硕士，高级工程师

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引用本文:

李清, 张德平, 李晓荣, 王薇, 孙宝壮, 艾池. TP110TS和P110钢在CO₂注入井环空环境中应力腐蚀行为比较[J]. 中国腐蚀与防护学报, 2020, 40(4): 302-308.
Qing LI, Deping ZHANG, Xiaorong LI, Wei WANG, Baozhuang SUN, Chi AI. Comparison of Stress Corrosion Behavior of TP110TS and P110 Steel in a Simulated Annular Environment of CO₂ Injection Well. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 302-308.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.126 或 https://www.jcscp.org/CN/Y2020/V40/I4/302

表1 TP110TS和P110油管钢的化学组成

图1 P110和TP110TS油管钢的金相组织

图2 TP110TS和 P110钢在添加不同浓度缓蚀剂条件下浸泡720 h后的宏观形貌

表2 不同缓蚀剂浓度条件下两类油套管钢U形弯腐蚀及开裂情况对比

图3 P110和 TP110TS钢在不同浓度缓蚀剂条件下浸泡720 h除锈后的微观形貌

图4 不同缓蚀剂浓度下TP110TS和P110钢的极化曲线

表3 不同缓蚀剂浓度下TP110TS和P110钢的极化曲线拟合结果

图5 不同缓蚀剂浓度下TP110TS和P110钢的电化学阻抗谱

图6 不同缓蚀剂浓度下TP110TS和P110钢EIS的等效电路图

表4 不同缓蚀剂浓度下TP110TS和P110钢的电化学等效电路图拟合结果

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