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等离子改性碳纤维对固井水泥界面的影响
作者:程小伟 时宇 龙丹 孔婷 段艺 李早元 张兴国 郭小阳 
单位:油气藏地质及开发工程国家重点实验室 西南石油大学 成都 610500 
关键词:碳纤维 G级油井水泥 等离子改性 界面性能 
分类号:TE256
出版年,卷(期):页码:2016,44(5):1-5
DOI:10.14062/j.issn.0454-5648.2016.05.10
摘要:

?为了改善纤维与水泥之间的界面粘接效果,采用低温等离子处理对碳纤维表面进行改性,将改性后掺量为0.2%的碳纤维加入到水泥基体中,通过抗折性能测试、渗透性实验和微观形貌观察,研究碳纤维对水泥基体性能影响和纤维与水泥基体粘接情况。结果表明:等离子体处理60 s后,碳纤维氮吸附能力显著增强氮吸附值达到50 m2/kg。红外光谱羰基吸收峰显著增强,表明碳纤维表面形成羰基。X射线光电子能谱分析证实了碳纤维表面羰基的存在。通过三轴测试得出表面改性后水泥石韧性提高。通过孔径测试显示,掺入等离子改性碳纤维后水泥石内部孔径变小,结构密实。通过SEM观察发现,等离子改性后,碳纤维与水泥基界面粘接作用加强。

 
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 In order to improve the interface bonding effect of fiber and oil well cement, carbon fiber was surface-modified through low-temperature plasma. To examine its effects on cement slurry property and adhesion with cement, the plasma-modified carbon fiber with amount of 0.2% was added into a cement matrix followed by flexural performance testing, permeability testing, and scanning electron microscopy analysis. Result showed that nitrogen absoption property of carbon fiber was significantly improved, its Brunauer, Emmett, and Teller value was 50 m2/kgafter plasma treatment for 60 s. Infrared spectral data showed that carbonyl absorption peak was significantly increased, indicating the formation of carbonyl bond. X-ray photoelectron spectroscopic data confirmed the presence of carbonyl on the surface of plasma-modified carbon fiber. According to aperture test, cement incorporated with plasma-modified carbon fiber had decreased pore size with an increasingly compact. SEM observations confirmed that the plasma-modified carbon fiber had strengthened adhesion with cement matrix.

 
基金项目:
高等学校博士学科点专项科研基金(20115121120006),四川省教育厅重点科研项目(13ZA0182)。
作者简介:
程小伟(1977—),男,博士,副教授。
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