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油井水泥石的硫酸盐侵蚀
作者:张景富1 王珣1 王宇2 王兆君1 
单位:1. 东北石油大学 提高油气采收率教育部重点实验室 黑龙江 大庆 163318 2. 河北联合大学 资源与 
关键词:油井水泥 硫酸盐侵蚀 微观结构 强度 
分类号:TE256
出版年,卷(期):页码:2011,39(12):141-146
DOI:
摘要:

为探索抗腐蚀油井水泥浆体系的设计基础及途径,用X射线衍射仪、扫描电子显微镜、强度检测仪检测受腐蚀油井水泥石的产物、微观结构及抗压强度,研究调整井三次采油过程中油井水泥石的硫酸盐侵蚀问题。明确腐蚀作用方式,揭示抗压强度变化规律。结果表明:SO42–对水泥石产生的腐蚀类型为钙矾石–石膏混合型腐蚀;水泥石强度变化规律发生改变的临界腐蚀时间约为21 d,腐蚀低于21 d时,水泥石强度随腐蚀时间及SO42–浓度的增加而增大;腐蚀达到21 d后,水泥石强度低于未腐蚀水泥石,水泥石强度随腐蚀时间及SO42–浓度的增加大幅度下降;腐蚀21 d内,水泥石的强度随温度升高而增加;腐蚀28 d时,最初随温度增加强度呈上升趋势,达到55 ℃后,随温度继续增加强度上升的幅度有所减弱。

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In order to probe into the basis and approaches for design of anti-corrosive oil well cement paste systems, compositions of corrosion products, microstructure and compressive strength of corroded oil well cement paste matrix were examined by X-ray diffraction, scanning electron microscopy, and strength test instrument. Corrosion of the oil well cement paste matrix by sulfate ion (SO42–) during enhanced oil recovery (EOR) in adjustment wells was studied. Corrosion action type was identified and the change law of compressive strength was revealed. Results show that the corrosion type of cement paste matrix by SO42– is of ettringite-gypsum mixture corrosion. Critical corrosion time for the change of the compressive strength varying law is about 21 d. When corrosion time is less than 21 d, compressive strength of corroded cement paste matrix increases with the increase of the corrosion time and SO42– concentration. When corrosion time reaches or exceeds 21 d, compressive strengths of corrosive cement paste matrix is smaller than that of un-corroded cement for all of the samples. The compressive strength of corrosive cement paste matrix precipitously declines with the increase of corrosion time and SO42– concentration. When corrosion time is within 21 d, compressive strength of corrosive cement paste matrix increases with the increase of corrosion temperature. When cement paste matrix has been subject to erosion for 28 d, compressive strength increases with the increase of temperature until reaching 55 ℃ and then the increasing extent declined if the temperature continues to rise.

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基金项目:
作者简介:
张景富(1963—),男,博士,教授
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参考文献:

[1]  MA Baoguo, GAO Xiaojian, HE Zhongmao, et al. Corrosion damage concrete in presence of SO42– and CO32– [J]. J Chin Ceram Soc (in Chinese), 2004, 32(10): 1219–1224.
[2]  NIU Jinlin, ZHANG Yong. Effect of Mineral admixtures on sulfate attack of cement mortars [J]. J Chin Ceram Soc (in Chinese), 2006, 34 (1): 114–117.
[3]  YANG Changhui, ZHANG Jing, YE Jianxiong, et al. Effect of initial curing conditions on thaumasite form of sulfate attack of cementitious materials [J]. J Civil Architect Environm Eng (in Chinese), 2010, 32(2): 135–139.
[4]  WANG Qimin, JI Baofa, SUI Jun, et al. Practice and knowledge of tertiary recovery technique in Daqing oilfield petroleum [J]. Geology Oilfield Development Daqing (in Chinese), 2001, 20(2): 1–8, 16.
[5]  ZHANG Jingfu, WANG Yu, XU Ming, et al. Effect of carbon dioxide corrosion on compressive strength of oilwell cement [J](Eng). J Chin Ceram Soc (in Chinese), 2009, 37(4): 642–647.
[6]  IRASSAR E F, BONAVETTI V L, GONZÜLEZ M. Microstructural study of sulfate attack on ordinary and limestone Portland cements at ambient temperature [J]. Cem Concr Res, 2003, 33(1): 31–41.

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