| 摘要: |
| 为提高油井水泥石的性能，通过Aim和Goff模型计算，优选了油井水泥和活性填料的最佳配比，并结合水泥石抗压强度、渗透率、孔结构(MIP)的测试和水化产物的XRD，DSC TG，SEM分析，对模型计算结果进行了验证.结果表明：掺量为20%（质量分数，下同）的活性填料对油井水泥石性能的优化效果最佳，掺20%活性填料的油井水泥石在80℃下养护7，28d后其抗压强度可达351，39.4MPa，分别较净浆油井水泥石提高33.5%和45.9%；在驱替压力为7，15MPa时，掺20%活性填料油井水泥石均未发生渗滤(净浆油井水泥石的渗透率为3.02×10-6~7.68×10-6μm2)，其孔隙率（体积分数）分别为25.7%和213%，分别较净浆油井水泥石降低了18.4%和24.7%.活性填料掺量为20%时，80℃下养护7d的油井水泥石其Ca(OH)2衍射峰明显减弱、吸热峰明显降低，致密程度明显改善. |
| 关键词: 油井水泥 活性填料 模型计算 致密程度 |
| DOI：10.3969/j.issn.1007 9629.2013.04.004 |
| 分类号: |
| 基金项目:江苏省生态环境材料重点建设实验室开放课题项目(EML201209)；江苏省新型环保重点实验室开放课题基金资助项目(AE201113)；江苏省高校自然科学基金资助项目(12KJB430014)；国家自然科学基金资助项目(51072080) |
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| Improved Performance of Oil Well Cement Stone byActive Filler of Silicon Rich Alumina |
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ZHU Hua jun1, WU Qi sheng1, ZHANG Chang sen1, HUA Su dong2, TAO Dong yuan1, ZHANG Cheng nan1
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1.School of Materials Engineering, Yancheng Institute of Technology, Yancheng 224051, China;2.College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China
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| Abstract: |
| In order to improve the performance of oil well cement stone, the mix proportion of oil well cement and active filler was optimized depending on the model of Aim and Goff. The cement stones were investigated via compressive strength testing, permeability testing, MIP, XRD, DSC TG and SEM, and then the computed results of the model were certificated. Results show that 20% of the content(by mass) of active filler for oil well cement is optimal. The compressive strengths of samples cured for 7d and 28d at 80℃ are 35.1MPa and 39.4MPa respectively, and they increase 33.5% and 45.9% compared with pure oil well cement system respectively. The samples of cement stone does not permeate at displacement pressure of 7MPa and 15MPa (the permeability of pure oil well cement system is among 3.02×10-67.68×10-6μm2). Porosities are 25.7% and 21.3%(by volume), which decrease 18.4% and 24.7% compared with pure oil well cement system respectively. When the content of active filler is 20%, the intensities of XRD and endothermic peak of Ca(OH)2 in cement stone cured for 7d at 80℃ decrease obviously. Furthermore, the degree of densification of cement stone is improved. |
| Key words: oil well cement active filler model computing degree of densification |
