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二氧化碳对油井水泥石的腐蚀
作者:张景富 徐明 朱健军 王广雷 马淑梅  
单位:大庆石油学院 提高油气采收率教育部重点实验室 大庆石油管理局 大庆钻井工程技术研究院 大庆石油学院 提高油气采收率教育部重点实验室 大庆石油管理局 大庆钻井工程技术研究院 大庆石油管理局 大庆钻井工程技术研究院  黑龙江大庆163318 黑龙江大庆163413 黑龙江大庆163318 黑龙江大庆163413 黑龙江大庆163413 
关键词:水泥环  二氧化碳  腐蚀  机理 
分类号:TE983
出版年,卷(期):页码:2007,35(12):1651-1656
DOI:
摘要:

在分析二氧碳(CO2)腐蚀水泥的化学作用过程的基础上,测量和分析了腐蚀水泥石的微观结构、抗压强度及渗透率。结果表明:CO2对水泥产生腐蚀作用的本质在于CO2能够与水泥的水化产物相作用生成各种不同晶体结构的CaCO3,破坏了水泥石的原有产物组成及结构,导致腐蚀后水泥石的抗压强度下降,渗透率增大。温度、CO2分压增高,腐蚀水泥石抗压强度降低,渗透率增大。添加抗腐蚀填充材料的水泥浆腐蚀后初期抗压强度有所降低,后期抗压强度具有不下降或上升趋势。实验设计的6号水泥浆具有较好的抗腐蚀效果。

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On the basis of analyzing the chemical reaction process of cement corrosion by carbon dioxide (CO2), the microstructure compressive strength and permeability of cement stone were measured and analyzed. The following conclusions can be drawn. The nature of cement corrosion by CO2 is that the composition of the original hydration products and the microstructure of the cement are destroyed by CaCO3 with different kinds of crystal structures, which are produced from the chemical reaction between CO2 and the hydration products. Analysis of cement corrosion by CO2 indicated that the compressive strength was decreased and the permeability was increased. With the increase of temperature and CO2 differential pressure, the compressive strength was decreased and the per meability was increased. When corrosion-resistance damper materials were added to the cement slurries, the compressive strength o cement stone was decreased at early curing time, but either stayed the same or increased at later curing time. The No.6 cement slurry introduced is effective for resisting cement corrosion by CO2.

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基金项目:
黑龙江省科技计划(GZ05A602)资助项目。
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参考文献:

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