| Microstructure Formation and Degradation Mechanism of Cementitious Plugging Agent Slurries |
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| 作者姓名： | 阎培渝 |
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| 作者单位： | School of |
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| 摘 要： | The hydration products and microstructure of class G oil well cement and a newly developed plugging agent (YLD) slurries cured in the simulated temperature and pressure environment, which was of similar temperature and pressure with those at the bottom of oil well in a normal depth, were investigated using XRD, TG and SEM. Severe leakage is confirmed at the interface between hardened slurries and steel tube during the dynamically curing process, which induces the quick loss of cementing property of slurries. This should be the dominating cause of degradation of class G oil well cement slurry. A secondary hydration process can take place at the eroded interface of hardened YLD plugging agent slurry. Newly formed C-S-H gel has a self-healing effect to repair the damaged interface, which unceasingly maintains the cementing property of the YLD plugging agent slurry. Therefore, the effective using period of YLD plugging agent can be prolonged.
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| 收稿时间： | 11 January 2007 |
Microstructure Formation and Degradation Mechanism of Cementitious Plugging Agent Slurries |
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| YAN Peiyu,ZHOU Yongxiang,YANG Zhenjie,QIN Jian.Microstructure Formation and Degradation Mechanism of Cementitious Plugging Agent Slurries[J].Journal of Wuhan University of Technology. Materials Science Edition,2007,22(1):61-65. |
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| Authors: | YAN Peiyu ZHOU Yongxiang YANG Zhenjie QIN Jian |
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| Affiliation: | (1) School of Material Science and Engineering, Southeast University, Nanjing, 211189, China;(2) Tongji University, Shanghai, China |
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| Abstract: | The hydration products and microstructure of class G oil well cement and a newly developed plugging agent (YLD) slurries cured in the simulated temperature and pressure environment, which was of similar temperature and pressure with those at the bottom of oil well in a normal depth, were investigated using XRD, TG and SEM. Severe leakage is confirmed at the interface between hardened slurries and steel tube during the dynamically curing process, which induces the quick loss of cementing property of slurries. This should be the dominating cause of degradation of class G oil well cement slurry. A secondary hydration process can take place at the eroded interface of hardened YLD plugging agent slurry. Newly formed C-S-H gel has a self-healing effect to repair the damaged interface, which unceasingly maintains the cementing property of the YLD plugging agent slurry. Therefore, the effective using period of YLD plugging agent can be prolonged. |
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| Keywords: | oil well cement YLD plugging agent microstructure degradation leaching |
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