空心玻璃微珠低密度水泥有效弹性模量计算与分析  

Calculation and analysis of effective elastic modulus of hollow glass microspheres low density cement

作　　者：刘曼宇 李早元[1,3] 刘伟[4] 刘洋[4] 黄盛[1,3] 杨焱岚 陈俊文 LIU Manyu;LI Zaoyuan;LIU Wei;LIU Yang;HUANG Sheng;YANG Yanlan;CHEN Junwen(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;School of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,China;Downhole Operation Projection Company,Chuanqing Drilling Engineering Co.,Ltd.,Chengdu 610500,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学油气藏地质及开发工程全国重点实验室,四川成都610500 [2]西南石油大学新能源与材料学院,四川成都610500 [3]西南石油大学石油与天然气工程学院,四川成都610500 [4]中国石油川庆钻探工程有限公司井下作业公司,四川成都610052 [5]西南石油大学化学化工学院,四川成都610500

出　　处：《断块油气田》2024年第5期900-908,915,共10页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目“固井水泥环界面密封损伤机理与改善机制研究”(52274010);四川省自然科学基金项目“页岩气井多级压裂水泥环封隔失效机理与控制方法研究”(2023NSFSC0927);中国石油-西南石油大学创新联合体科技合作项目“深/超深井/水平井安全高效建井关键基础理论与技术研究”(2020CX040000)。

摘　　要：空心玻璃微珠低密度水泥是典型的高水灰比、低胶凝相、多掺杂的多相多层次非均质复合材料,在弹性阶段其宏观力学性能由细观、微观乃至纳观尺度下的组成与结构决定。为探究材料的细微观结构对宏观力学性能的影响,在细微观力学框架下,基于Mori-Tanaka法、自洽法和四相模型,建立了考虑界面与微珠相互作用的微珠-低密度水泥弹性模量的多尺度均匀化理论模型,根据实验验证结果进行了影响因素拓展和分析。结果表明:水泥养护龄期越长,其弹性模量越高,但随着时间增长,弹性模量增大的趋势逐渐放缓,到28 d时趋于平稳;ITZ(界面过渡区)厚度是水泥弹性模量的重要影响因素,厚度的增加会使水泥的弹性模量极大地减小;微珠的密度与弹性模量共同影响水泥的弹性模量。Hollow glass microspheres low-density cement is a typical multiphase and multilevel heterogeneous composite material with high water-cement ratio,low cementing phase and many dopants.Its macroscopic mechanical properties at the elastic stage are determined by its composition and structure at the meso-,micro-and even nano-scales.In order to explore the effect of material meso-and micro-structure on macro-mechanical properties,a multi-scale homogenization theoretical model of elastic modulus of microspheres-low-density cement considering the interaction between interface and microspheres was established under framework of meso-and micro-mechanics based on Mori-Tanaka method,self-consistent method and four-phase model.Based on the experimental results,the influencing factors were expanded and analyzed.The results show that the longer the curing age of cement,the higher the elastic modulus,but with the increase of time,the increasing trend of elastic modulus will gradually slow down and tend to be stable by the time of 28 days.The thickness of interfacial transition zone(ITZ)is an important influence factor of the elastic modulus of cement,and the increase of thickness will greatly reduce the elastic modulus of cement.The density and elastic modulus of mi crospheres afect the elastic modulus of cement together.

关 键 词：低密度水泥 空心玻璃微珠 弹性模量 多尺度 均匀化 

分 类 号：TE256.2[石油与天然气工程—油气井工程]