表面修饰材料制备疏水油井水泥的性能评价
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1.西南石油大学 化学化工学院;2.西南石油大学 油气蔵地质及开发工程国家重点实验室

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TE39;TQ172.751

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中国石油天然气股份有限公司重大科技专项“西南油气田天然气上产300亿立方米勘探开发关键技术研究与应用”(2016E-0613)


Performance evaluation of hydrophobic oil well cement prepared by surface modification materialsXie Tianjing1, Yang Xu1,*, Wu Xiaoling2, Yang Jie1, Li Jiangtao1
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School of Chemistry and Chemical Engineering, Southwest Petroleum University

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    摘要:

    水泥材料具有多孔性和亲水性的特点,易使水渗入并破坏内部结构。疏水水泥拥有防污、防水的性能,从而在一定程度上减缓水泥的腐蚀与破坏。现有的研究已证明在水泥体系中添加油酸在其结构的每个部分均具有明显的疏水性是有效的,但并不均匀。本研究将被油酸表面修饰过的石英砂(OA-1)引入水泥并测试了水泥试块的润湿性和抗压强度。同时与直接添加油酸(OA-2)和利用异丙醇溶解油酸(OA-3)的方式进行了对比。测试结果表明,具有最佳疏水效果的是油酸含量为5%的OA-1 Cement。所测WCA的平均值可达145.18°,养护3d后的抗压强度大于21MPa。并通过SEM和XRD表征疏水水泥材料的微观结构和化学成分。这种方法大大提高了水泥的疏水性和防渗性,在今后的建筑及固井工程中具有潜在的应用价值。

    Abstract:

    Cement material has the characteristics of porosity and hydrophilicity, easy to make water infiltration and destroy the internal structure. Hydrophobic cement has the properties of antifouling and waterproof, thus slowing down the corrosion and damage of cement to a certain extent. Existing studies have shown that adding oleic acid to a cement system with significant hydrophobicity in every part of its structure is effective, but not uniform. In this study, oleic acid coated quartz sand (OA-1) was introduced into cement and the wettability and compressive strength of cement test blocks were tested. The results were compared with those of adding oleic acid directly (OA-2) and using isopropanol to dissolve oleic acid (OA-3). The test results showed that OA-1 Cement with oleic acid content of 5% had the best hydrophobic effect. The average value of the measured WCA can reach 145.18°, and the compressive strength after curing for 3 days is greater than 21MPa. The microstructure and chemical composition of hydrophobic cement were characterized by SEM and XRD. This method greatly improves the hydrophobicity and impermeability of cement and has potential application value in future construction and cementing projects.

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  • 收稿日期:2021-05-12
  • 最后修改日期:2021-06-21
  • 录用日期:2021-09-03
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