围压下凝灰岩力学特征和脆性指数变化规律

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英文篇名：The Mechanical Characteristics and Brittle Index of Tuff Rock under Confining Pressure 作者：张立刚 ; 谭甲兴 ; 闫立鹏 ; 刘照义 ; 李士斌 ; 曲思凝 英文作者：Zhang Ligang;Tan Jiaxing;Yan Lipeng;Liu Zhaoyi;Li Shibin;Qu Sining;School of Petroleum Engineering,Northeast Petroleum University;Research Institute of Petroleum Engineering,SINOPEC; 关键词：凝灰岩 ; 三轴压缩试验 ; 力学特性 ; 脆-延性转换 ; 临界围压 英文关键词：tuff rock;;triaxial compression experiment;;mechanical property;;brittle-ductile transition;;critical confining pressure 中文刊名：CJDL 英文刊名：Journal of Yangtze University(Natural Science Edition) 机构：东北石油大学石油工程学院;中石化石油工程技术研究院; 出版日期：2019-01-25 出版单位：长江大学学报(自然科学版) 年：2019 期：v.16;No.245 基金：国家自然科学基金青年基金项目(51504067);; 黑龙江省自然科学基金青年基金项目(QC2017042) 语种：中文; 页：CJDL201901006 页数：7 CN：01 ISSN：42-1741/N 分类号：5-6+39-43

摘要

围压下凝灰岩力学特征和脆-延性评价对指导该类火成岩气藏的高效开发有重要意义。以松辽盆地北部深层凝灰岩为研究对象,基于常规三轴压缩试验和Mohr-Coulomb强度准则,研究了其在不同围压下的强度、变形参数、破坏特征及脆-延性转换机制。研究结果表明,随着围压增加,凝灰岩的强度显著增加,变形能力增强,破坏前段凝灰岩经历了塑弹性-弹性-弹塑性转变,破坏后应变软化特性逐渐减弱;与峰值强度曲线相比,残余强度曲线斜率更高,随着围压增加,两者趋于闭合;随着围压增加,脆性指数呈指数函数形式减小,由脆性向延性转变。该研究成果为钻井和压裂等工程设计提供了基础依据。
        The mechanical characteristics and brittle-ductility evaluation of tuff under confining pressure were of great significance to guide the efficient development of this kind of igneous gas reservoirs.The tuff rocks in the deeper layer from Songliao Basin were taken as the object of study.Based on the conventional triaxial compression experiments and Mohr-Coulomb criterion of strength,the strength,deformation parameters,breaking characters and the brittle-ductile transition law were researched under different confining pressures.The results show that with the increase of confining pressure,the strength and deformation ability of the tuff rock increase significantly.It experiences the transition from plasticity-elasticity,elasticity to elasticity-plasticity before it is destroyed.The strain softening is weakened gradually after it is destroyed.Compared with the peak strength curve,the slope of the residual strength curve is higher.Both of them tend to be closed with the increase of confining pressure.With the increase of confining pressure,the brittleness index decreases in the form of exponential function.The mechanical properties of tuff changes from brittle to ductile.The research results provide basis for engineering design of drilling or fracturing.

引文

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