| 蒋 凯,姜 祥,于 斌,姚 晓.常用外掺料对G级油井水泥体积稳定性及力学性能的影响*[J].水泥工程,2019,32(2):1-6 |
| 常用外掺料对G级油井水泥体积稳定性及力学性能的影响* |
| Effects of common admixtures on volume stability and mechanical properties of class G oil well cement slurry |
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| DOI： |
| 中文关键词: G级油井水泥 矿渣 石英粉 体积稳定性 力学性能 |
| 英文关键词: G oil well cement slag quartz powder volume stability mechanical properties |
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| 中文摘要: |
| 针对G级油井水泥浆体体积收缩问题，对比研究了两种常用外掺料（矿渣和石英粉）对水泥浆体体积稳定性及力学性能的影响，并利用等温量热仪（ICC）、X射线衍射仪（XRD）、压汞仪（MIP）和扫描电镜（SEM）分别测试了两种外掺料对水泥水化放热速率，水泥水化产物、孔结构及水泥石微观形貌的影响。结果表明：80 ℃下水泥净浆体积收缩主要发生在水化早期，对应水泥石早期抗压强度、抗折强度增长迅速；掺入30%比表面积为340 m2/kg的矿渣部分改善浆体体积收缩，150 d线收缩率较净浆减小32%，早期抗压强度、抗折强度减小，后期强度增大并超过净浆；掺入30%比表面积为710 m2/kg的石英粉加剧了浆体体积收缩，150 d线收缩率较净浆增大40%，早期抗压强度、抗折强度远低于净浆及掺30 %矿渣水泥。长期水养后部分超细SiO2参与反应，加之细颗粒的填充作用使其150 d力学强度超过净浆及掺30%矿渣水泥，即水泥石力学强度不仅与外掺料活性有关，还与其粒径分布和养护龄期密切相关。 |
| 英文摘要: |
| Based on shrinkage for class G oil well cement slurry in using process, effects of two common admixtures （slag and quartz powder） on volume stability and mechanical properties of class G oil well cement slurry were contrasted, and effects of two common admixtures on early exothermic rate of hydration, hydration products, pore structure and microstructure were characterized by isothermal conduction calorimetery （ICC）, X-ray diffraction analyzer （XRD）, mercury intrusion porosimetry （MIP） and scanning electron microscope （SEM）. The results show that at the temperature of 80 ℃, the main shrinkage of class G oil well cement slurry occurred during early hydration period, and the early compression strength, flexural strength of cement paste increased rapidly; The volume shrinkage of cement slurry with 30% slag （340 m2/kg） has reduced, the linear shrinkage （150 d） reduced by 32%. the early compression strength, flexural strength of cement paste with 30% slag decreased, but the last strength increased even more than the strength of pure cement paste; The volume shrinkage of cement slurry with 30% quartz powder （710 m2/kg） increased, the linear shrinkage （150 d） increased by 40% and the early compression strength, flexural strength of cement paste with 30% quartz powder lower than that of pure cement paste and cement paste with 30% slag. After long term water-bath curing, part of super fine SiO2 involved in the reaction, and favorable grain composition make the strength（150 d） of cement paste with 30% quartz powder higher than that of pure cement paste and cement paste with 30% slag, so the strength of cement paste was influenced by not only the acticity of admixtures but also the particle size and curing age. |
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