高温下赤泥与硅粉协同强化固井水泥石力学性能  

Mechanical properties of cement stone reinforced by red mud and silicon fume at high temperature

作　　者：赵昆鹏 王涛 郭春 罗阳利 韦庭丛 梅开元[1] 张春梅[1] 赵峰[1] 程小伟[1] ZHAO Kunpeng;WANG Tao;GUO Chun;LUO Yangli;WEI Tingcong;MEI Kaiyuan;ZHANG Chunmei;ZHAO Feng;CHENG Xiaowei(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610000,China;Sichuan Huashuntong Energy Technology Development Co.,Ltd.,Chengdu 610000,China;Sichuan Chuanqing Underground Technology Co.,Ltd.,Guanghan 618300,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610000 [2]四川华顺通能源技术开发有限公司,四川成都610000 [3]四川川庆井下科技有限公司,四川广汉618300

出　　处：《中国粉体技术》2023年第2期74-80,共7页China Powder Science and Technology

基　　金：四川省区域创新合作项目,编号:2021YFQ0045。

摘　　要：为了抑制水泥石高温下强度衰退现象,研究硅粉加量,以及赤泥与硅粉在高温下的协同作用对G级油井水泥石抗压强度的影响,并借助X射线衍射、热重分析高温下水泥水化产物的变化,通过扫描电镜观察水泥石的微观形貌。结果表明:225℃高温养护7 d后,35%硅粉(质量分数)可以提高水泥石高温力学性能,5%赤泥(质量分数)可以协助硅粉进一步提高水泥石高温下的强度,同对照组相比抗压强度提高11.3%。赤泥掺入促进水泥石内部生成纤维状硬硅钙石(Ca_(6)Si_(6)O_(17)(OH)_(2), C_(6)S_(6)H)物相,水泥石内部孔结构减少,水泥石内部结构致密。In order to restrain the strength decline of cement stone at high temperature, the influence of the addition of silica fume and the synergistic effect of red mud and silica fume at high temperature on the compressive strength of G-grade oil well cement stone were studied, and the changes of cement hydration products at high temperature were analyzed by means of X-ray diffraction and thermogravimetry. The microstructure of cement stone was observed by scanning electron microscope. The results show that after curing at 225 ℃ for 7 d, 35% silica fume(mass fraction) can improve the high temperature mechanical properties of the cement stone, and 5% red mud(mass fraction) can help the silica fume to further improve the strength of cement stone at high temperature. Comparing with the control group, its compressive strength is improved by 11.3%. The addition of red mud promotes the formation of fibrous xonotlite(C_(6)S_(6)H) phase in cement stone. The internal pore structure of the cement stone is reduced, and the internal structure of cement stone is dense.

关 键 词：赤泥 硅粉 G级油井水泥 强度衰退 高温养护 

分 类 号：TE256[石油与天然气工程—油气井工程]