环境响应型聚合物对水泥石抗CO2腐蚀性能的影响

doi:10.7623/syxb201806009

石油学报 ›› 2018, Vol. 39 ›› Issue (6): 703-711.DOI: 10.7623/syxb201806009

环境响应型聚合物对水泥石抗CO₂腐蚀性能的影响

彭志刚¹, 张健¹, 冯茜¹, 郑勇¹, 刘欢¹, 焦利宾²

1. 西南石油大学化学化工学院四川成都 610500;
2. 中国石油西南油气田分公司工程技术研究院四川德阳 618300

收稿日期:2017-12-03 修回日期:2018-05-01 出版日期:2018-06-25 发布日期:2018-07-03
通讯作者: 彭志刚,男,1976年10月生,1998年获西南石油学院学士学位,2004年获西南石油学院博士学位,现为西南石油大学化学化工学院教授,主要从事复杂油气田钻完井研究和教学。Email:116004373@qq.com
作者简介:彭志刚,男,1976年10月生,1998年获西南石油学院学士学位,2004年获西南石油学院博士学位,现为西南石油大学化学化工学院教授,主要从事复杂油气田钻完井研究和教学。Email:116004373@qq.com
基金资助:
国家科技重大专项（2012AA091501003）资助。

Effects of environmental responsive polymer on the anti-CO₂ corrosion performance of set cement

Peng Zhigang¹, Zhang Jian¹, Feng Qian¹, Zheng Yong¹, Liu Huan¹, Jiao Libin²

1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. Engineering Technology Research Institute, PetroChina Southwest Oil and Gas Field Company, Sichuan Deyang 618300, China

Received:2017-12-03 Revised:2018-05-01 Online:2018-06-25 Published:2018-07-03

摘要/Abstract

摘要：

利用压汞法、扫描电子显微镜和X射线衍射仪等分析方法研究了环境响应型聚合物ERP对油井水泥石抗CO₂腐蚀性能的影响，并揭示了其改善水泥石抗腐蚀性能的作用机理。结果表明，聚合物ERP使腐蚀60 d的水泥石孔径分布发生明显变化，有害孔（>100 nm）减少51.13%，微细孔（<50 nm）增大32.07%，总孔隙率降低16.31%，孔径细化；聚合物ERP可在水泥石遇酸表面或者内部形成一层膜状物质，膜状物质有效屏蔽了腐蚀介质与水化产物的直接接触，保持了水泥石结构完整性和水化产物相对稳定性；ERP改善水泥石抗腐蚀性能的作用机理为形成水化产物"包被层"，减少与离子交换源接触机会；腐蚀环境下形成连续分布"膜状物质"，阻断酸性腐蚀介质渗流通道。

关键词: 油井水泥石, 聚合物, CO₂腐蚀, 抗腐蚀性能, 孔径分布

Abstract:

By using mercury intrusion method, scanning electron microscope and X-ray diffractometer and other analytical methods, this study investigates the effects of environmental responsive polymer (ERP)on anti-CO₂ corrosion performance of set cement, and reveals the mechanism of improving its anti-corrosion performance. The results show that the pore size distribution of set cement corroded for 60 days changes obviously due to ERP, of which the harmful pore (>100 nm)is reduced by 51.13%, the micropore (<50 nm)is increased by 32.07% and the total porosity is decreased by 16.31% with pore diameter refining. ERP can form a film-like substance on surface or inside of set cement when encountering acid, and the film-like substance can effectively shield the direct connection between corrosive medium and hydration products, thus maintaining the complete structure of set cement and the relative stability of hydration product. The mechanism of ERP improving set cement anti-corrosion performance is to form the "enveloping layer" of hydration product, thus reducing the contact with ion exchange source. Meanwhile, under the corrosion environment, a continuous distribution of film-like substance is formed to block the infiltration channel of acid medium.

Key words: oil-well set cement, polymer, CO₂ corrosion, anti-corrosion performance, pore size distribution

中图分类号:

TE256

彭志刚, 张健, 冯茜, 郑勇, 刘欢, 焦利宾. 环境响应型聚合物对水泥石抗CO₂腐蚀性能的影响[J]. 石油学报, 2018, 39(6): 703-711.

Peng Zhigang, Zhang Jian, Feng Qian, Zheng Yong, Liu Huan, Jiao Libin. Effects of environmental responsive polymer on the anti-CO₂ corrosion performance of set cement[J]. Acta Petrolei Sinica, 2018, 39(6): 703-711.

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环境响应型聚合物对水泥石抗CO₂腐蚀性能的影响

Effects of environmental responsive polymer on the anti-CO₂ corrosion performance of set cement

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