新型油井水泥物相组成调控及力学性能研究  

Phase Composition Control and Mechanical Property of New Oil Well Cement

作　　者：倪修成 程小伟[1,2] 黎俊吾 王晶 高显束 张高寅 张春梅[1,2] 刘开强 NI Xiucheng;CHENG Xiaowei;LI Junwu;WANG Jing;GAO Xianshu;ZHANG Gaoyin;ZHANG Chunmei;LIU Kaiqiang(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Sichuan Shale Gas Exploration and Development Co.,Ltd.,Chengdu 610000,China;China Building Materials Academy,Beijing 100024,China)

机构地区：[1]西南石油大学新能源与材料学院,成都610500 [2]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [3]四川页岩气勘探开发有限责任公司,成都610000 [4]中国建筑材料科学研究总院有限公司,北京100024

出　　处：《硅酸盐通报》2021年第8期2534-2545,共12页Bulletin of the Chinese Ceramic Society

基　　金：四川省区域创新合作项目(2021YFQ0045)。

摘　　要：为了解决页岩气开采时固井水泥环产生破坏失效的问题,通过矿物组成计算和调整生料配比,采用岩相、XRD分析以及扫描电镜测试手段,开展油井水泥物相组成调控研究,探索不同矿物组成的水泥力学性能及相关水化产物。结果表明:所研制的新型油井水泥7 d抗压、抗折强度分别为45.3 MPa、8.9 MPa;28 d抗压、抗折强度分别为54.2 MPa、9.6 MPa;7 d弹性模量降至7.1 GPa,与G级油井水泥相比降低了14.4%,显示出更为优异的力学性能。通过微观分析得出新型油井水泥力学性能增强的机制是由于矿物组成的改变使其水化产物中产生了更多的C-S-H凝胶,同时铁相含量的提升也生成了更多富铁(铝)凝胶,水化产物之间形成紧密的桥联结构,整体结构更为密实。新型油井水泥抗压、抗折强度以及韧性都较G级油井水泥更为优异,对于页岩气安全、高效的开采具有重要参考价值。In order to solve the problem of damage and failure of cementing ring during shale gas exploitation,the ratio of raw materials through mineral composition was calculated and adjusted.The oil well cement phase composition control research was studied by lithofacies,XRD analysis and scanning electron microscopy tests.And the mechanical properties of cement with different mineral compositions and related hydration products were explored.The results show that the compressive and flexural strength of the developed new oil well cement reach 45.3 MPa and 8.9 MPa for 7 d,54.2 MPa and 9.6 MPa for 28 d,respectively.The 7 d elastic modulus is reduced to 7.1 GPa,which is 14.4%lower than that of G grade oil well cement,showing more excellent mechanical properties.Through microscopic analysis,it is concluded that the mechanism of the enhancement of the mechanical properties of the new oil well cement is due to the change in the mineral composition,which produces more C-S-H gel in the hydration product.At the same time,the increase in the content of the iron phase also produces more iron(aluminum)-rich gels,forming a tight bridge structure between the hydration products,and the overall structure is more compact.The new type of oil well cement has better compressive strength,flexural strength and toughness than G grade oil well cement,which has important reference value for the safe and efficient exploitation of shale gas.

关 键 词：G级油井水泥 矿物组成 页岩气固井 力学性能 微观机理 

分 类 号：TE256[石油与天然气工程—油气井工程]