赵昆鹏1，王 涛2，郭 春2，罗阳利3，韦庭丛1，梅开元1，张春梅1，赵 峰1，程小伟1
（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）
DOI：10.13732/j.issn.1008-5548.2023.02.009
收稿日期：2022-08-29，修回日期：2022-10-14，在线出版时间：2023-01-31 15:38。
基金项目：四川省区域创新合作项目，编号：2021YFQ0045。
第一作者简介：赵昆鹏(1998—)，男，硕士研究生，研究方向为固井水泥石高温力学性能。E-mail：zkp10010@163.com。
通信作者简介：程小伟(1977—)，男，教授，博士，博士生导师，研究方向为先进胶凝材料与其在固井中应用。E-mail：chengxw@swpu.edu.cn。
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(Ca6Si6O17(OH)2, C6S6H)物相，水泥石内部孔结构减少，水泥石内部结构致密。
关键词：赤泥；硅粉；G级油井水泥；强度衰退；高温养护
Abstract：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(C6S6H) phase in cement stone. The internal pore structure of the cement stone is reduced, and the internal structure of cement stone is dense.
Keywords：red mud; silica fume; G-grade oil well cement; strength declination; high temperature curing
参考文献(References)：
[1]杨智光，崔海清，肖志兴.深井高温条件下油井水泥强度变化规律研究[J].石油学报，2008, 29(3): 435-437.
[2]GÖKÇE H.High temperature resistance of boron active belite cement mortars containing fly ash[J].Journal of Cleaner Production, 2019, 211: 992-1000.
[3]TIAN Y, YU R G, ZHANG N, et al.Preparation of high temperature resistance and high strength low density oil well cement[J].Emerging Materials Research, 2020, 9(1): 163-167.
[4]PANG X Y, QIN J K, BU Y H, et al.Research advances in oil well cement subjected to high temperature and high pressure curing environment[J].Journal of Oil and Gas Technology, 2020, 42(1): 13-23.
[5]桑来玉.硅粉对水泥石强度发展影响规律[J].钻井液与完井液，2004, 21(6): 43-45.
[6]TANG W C, WANG Z, LIU Y, et al.Influence of red mud on fresh and hardened properties of self-compacting concrete[J].Construction and Building Materials, 2018, 178: 288-300.
[7]王磊，曾义金，张青庆，等.高温环境下油井水泥石力学性能试验[J].中国石油大学学报(自然科学版)，2018, 42(6): 88-95.
[8]姚晓，葛荘，汪晓静，等.加砂油井水泥石高温力学性能衰退机制研究进展[J].石油钻探技术，2018, 46(1): 17-23.
[9]RIBEIRO D V, LABRINCHA J, MORELLI M R.Effect of calcined red mud addition on the hydration of portland cement[J].Materials Science Forum, 2012, 727: 1408-1411.
[10]LIU Y T, QIN Z H, CHEN B.Experimental research on magnesium phosphate cements modified by red mud[J].Construction and Building Materials, 2020, 231: 117-131.
[11]崔延帅，刘鹏飞，李文福，等.赤泥在水泥生产中的研究进展及替代原料可行性分析[J].混凝土世界，2021, 10: 74-78.
[12]王鑫书，黄德修.赤泥利用的研究[J].轻金属，1999, 5: 13-15.
[13]南相莉，张延安，刘燕，等.我国主要赤泥种类及其对环境的影响[J].过程工程学报，2009, 9(1): 459-464.
[14]武斌，谭卓英，宁迎福.赤泥掺量对混凝土强度及经济性的影响[J].河南理工大学学报(自然科学版)，2021, 40(6): 182-188.
[15]AI T, ZHONG D N, ZHANG Y, et al.The effect of red mud content on the compressive strength of geopolymers under different curing systems[J].Buildings, 2021, 11(7): 298.
[16]LUO S Q, LIU M, YANG L, et al.Utilization of waste from alumina industry to produce sustainable cement-based materials[J].Construction & Building Materials, 2019, 229: 116795.
[17]中国国家标准化管理委员会.GB/T 19139—2012：油井水泥试验方法[S].北京, 中国标准出版社: 2012.
[18]PERNITES R B, SANTRA A K.Portland cement solutions for ultra-high temperature wellbore applications[J].Cement and Concrete Composites, 2016, 72: 89-103.
