等离子改性废旧橡胶颗粒增强固井水泥石性能

doi:10.7623/syxb201402020

石油学报 ›› 2014, Vol. 35 ›› Issue (2): 371-376.DOI: 10.7623/syxb201402020

等离子改性废旧橡胶颗粒增强固井水泥石性能

程小伟, 黄盛, 龙丹, 李早元, 郭小阳

西南石油大学油气藏地质及开发工程国家重点实验室四川成都 610500

收稿日期:2013-10-10 修回日期:2014-01-20 出版日期:2014-03-25 发布日期:2014-04-11
通讯作者: 郭小阳，男，1951年5月生，1977年获西南石油大学学士学位，现为西南石油大学教授、博士生导师，主要从事固井材料与固井工程研究。Email：guoxiaoyangswpi@126.com
作者简介:程小伟，男，1977年8月生，2002年获四川大学学士学位，2009年获西南石油大学博士学位，现为西南石油大学副教授，主要从事固井材料与固井工程研究。Email：cxw0261@sina.com
基金资助:
四川省教育厅科研项目（13ZA0182）资助。

Improvement of the properties of plasma-modified ground tire rubber filled cement paste

Cheng Xiaowei, Huang Sheng, Long Dan, Li Zaoyuan, Guo Xiaoyang

Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

Received:2013-10-10 Revised:2014-01-20 Online:2014-03-25 Published:2014-04-11

摘要/Abstract

摘要：

废旧橡胶颗粒属于憎水有机材料，与水泥浆相容性差。采用低温等离子体表面处理仪，对橡胶颗粒进行表面改性，通过红外分析、XPS分析，研究改性后橡胶颗粒表面基团的变化。将改性后的橡胶颗粒，加入到水泥基体中，通过力学性能测试、渗透性试验、微观形貌（SEM）观察，研究橡胶颗粒对水泥浆体性能的影响和橡胶颗粒与水泥基体的黏结情况。结果发现，通过等离子体处理180 s之后，橡胶颗粒的亲水性得到显著改善，分散性很好。通过红外光谱分析发现，等离子改性后，对应于C=C键的1 400~1 600 cm^-1 位置处的4个吸收峰强度显著增强，说明橡胶颗粒表面形成了C=C键。通过X射线光电子能谱分析，证实了橡胶颗粒表面含氧极性基团的存在。通过三轴应力测试得出表面改性后水泥石强度大幅度提高。通过压汞仪测试孔径分布可知，掺入橡胶颗粒后，水泥石内部孔径变小，结构更密实。通过SEM观察也发现，等离子改性后，橡胶颗粒与水泥基体黏结增强。

关键词: 等离子改性, 废旧橡胶颗粒, 水泥浆, 相容性, 固井

Abstract:

Ground tire rubber (GTR) is a hydrophobic organic material that has poor compatibility with cement slurry. In this study, GTR particle was surface-modified through low-temperature plasma treatment, with changes in surface groups examined by infrared and photoelectron spectroscopy analysis. To examine its effects on cement slurry property and adhesion with cement, the plasma-modified GTR particle was added into a cement matrix followed by mechanical testing, permeability testing, and scanning electron microscopy analysis. Results showed that hydrophobic property of the GTR particle was significantly improved with high dispersibility after plasma treatment for 180 s. Infrared spectral data showed that there were significant increases in peak intensity at the range of 1 400 to 1 600 cm-1 in the plasma-modified GTR particle, indicating the formation of carbon-carbon double bond. X-ray photoelectron spectroscopic data confirmed the presence of oxygen-containing polar functional groups on the surface of plasma-modified GTR particle. Triaxial stress test results showed that cement strength was greatly improved with surface-modified GTR particle. According to mercury pore size distribution, cement incorporated with the plasma-modified GTR particle had decreased pore size with an increasingly compact. SEM observations confirmed that the plasma-modified GTR particle had strengthened adhesion with the cement matrix.

Key words: plasma modification, ground tire rubber, cement slurry, compatibility improvement, well cementation

中图分类号:

TE256.6

程小伟, 黄盛, 龙丹, 李早元, 郭小阳. 等离子改性废旧橡胶颗粒增强固井水泥石性能[J]. 石油学报, 2014, 35(2): 371-376.

Cheng Xiaowei, Huang Sheng, Long Dan, Li Zaoyuan, Guo Xiaoyang. Improvement of the properties of plasma-modified ground tire rubber filled cement paste[J]. ACTA PETROLEI SINICA, 2014, 35(2): 371-376.

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等离子改性废旧橡胶颗粒增强固井水泥石性能

Improvement of the properties of plasma-modified ground tire rubber filled cement paste

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