储层砂岩破坏特征与脆性指数相关性影响的试验及数值研究
发布时间：2018-08-29 10:11
【摘要】：储层砂岩破坏特征及其脆性评价对油气田开采工程具有重要意义,针对胜利油田某油井隔层和油层砂岩岩芯,开展压缩条件下的物理试验及数值模拟。研究结果表明:储层岩芯在三轴压缩条件下的破坏模式以剪切破坏为主,同种围压的隔层岩芯脆性高于油层岩芯,脆性指数B较好地描述了岩芯脆性的变化趋势;分析了储层岩芯主要力学参数与脆性指数B的相关性,即在围压压缩条件下,岩芯峰值强度、扩容点、弹性模量、泊松比、残余强度及残余强度系数随脆性指数B的增加而降低,且用线性关系拟合各参数与脆性指数B的相关性较好;油层砂岩黏土矿物含量大于隔层砂岩是造成其脆性较高的内因,单轴压缩条件下的岩芯断面CT扫描图从细观上反映了2种岩芯脆性破坏特征的不同;在单轴压缩条件下,数值岩芯脆性随弹性模量、压拉比、内摩擦角的增加而增加,随泊松比、残余强度系数的增加而降低,与峰值强度之间的关系不大;在声发射模式上,储层砂岩以前震 主震 后震型和群震型为主,根据物理试验和数值计算结果,总结了脆性指数B与岩芯破裂声发射模式之间的内在关系,即在相同加载速率条件下,低脆性区、中脆性区和高脆性区岩芯声发射模式分别为群震型、前震 主震 后震型及主震型,通过对灰岩试样和不同种类煤体声发射模式的对比,验证了机制讨论的正确性。
[Abstract]:The failure characteristics and brittle evaluation of reservoir sandstone are of great significance to oil and gas field exploitation engineering. The physical test and numerical simulation under compression conditions are carried out for sandstone cores of a certain oil well in Shengli Oilfield. The results show that shear failure is the main failure mode of reservoir core under triaxial compression. The brittleness of interlayer core of the same confining pressure is higher than that of reservoir core, and the brittleness index B describes the change trend of core brittleness. The correlation between the main mechanical parameters of reservoir core and brittleness index B is analyzed, that is, under confining pressure compression, the peak strength, expansion point, elastic modulus and Poisson's ratio of the core are analyzed. The residual strength and residual strength coefficient decrease with the increase of brittleness index B, and the correlation between the parameters fitted by linear relation and brittleness index B is good, the clay content of sandstone in oil reservoir is larger than that of interlayer sandstone is the internal cause of its high brittleness. Under uniaxial compression condition, the CT scanning diagram of core section reflects the difference of brittle failure characteristics of two cores from meso-scale, and under uniaxial compression condition, numerical core brittleness increases with the increase of elastic modulus, compression ratio and internal friction angle. With the increase of Poisson's ratio, the residual strength coefficient decreases, but has little relation to the peak intensity. In acoustic emission mode, the reservoir sandstone is dominated by the main shock type and the swarm earthquake type, based on the results of physical test and numerical calculation. The intrinsic relationship between brittle exponent B and core rupture acoustic emission mode is summarized, that is, under the same loading rate, the core acoustic emission modes in low brittle zone, middle brittle zone and high brittle zone are swarms, respectively. By comparing the acoustic emission patterns of limestone samples with different types of coal bodies, the correctness of the discussion on the mechanism is verified.
【作者单位】： 大连理工大学海岸和近海工程国家重点实验室;绍兴文理学院土木工程学院;中国石油化工股份有限公司胜利油田分公司石油工程技术研究院;
【基金】：国家自然科学基金资助项目(51479024) 国家重点基础研究发展计划(973)项目(2014CB047103) 安徽省科技计划项目(1604a0802109)~~
【分类号】：TE311
本文编号：2210885
[Abstract]:The failure characteristics and brittle evaluation of reservoir sandstone are of great significance to oil and gas field exploitation engineering. The physical test and numerical simulation under compression conditions are carried out for sandstone cores of a certain oil well in Shengli Oilfield. The results show that shear failure is the main failure mode of reservoir core under triaxial compression. The brittleness of interlayer core of the same confining pressure is higher than that of reservoir core, and the brittleness index B describes the change trend of core brittleness. The correlation between the main mechanical parameters of reservoir core and brittleness index B is analyzed, that is, under confining pressure compression, the peak strength, expansion point, elastic modulus and Poisson's ratio of the core are analyzed. The residual strength and residual strength coefficient decrease with the increase of brittleness index B, and the correlation between the parameters fitted by linear relation and brittleness index B is good, the clay content of sandstone in oil reservoir is larger than that of interlayer sandstone is the internal cause of its high brittleness. Under uniaxial compression condition, the CT scanning diagram of core section reflects the difference of brittle failure characteristics of two cores from meso-scale, and under uniaxial compression condition, numerical core brittleness increases with the increase of elastic modulus, compression ratio and internal friction angle. With the increase of Poisson's ratio, the residual strength coefficient decreases, but has little relation to the peak intensity. In acoustic emission mode, the reservoir sandstone is dominated by the main shock type and the swarm earthquake type, based on the results of physical test and numerical calculation. The intrinsic relationship between brittle exponent B and core rupture acoustic emission mode is summarized, that is, under the same loading rate, the core acoustic emission modes in low brittle zone, middle brittle zone and high brittle zone are swarms, respectively. By comparing the acoustic emission patterns of limestone samples with different types of coal bodies, the correctness of the discussion on the mechanism is verified.
【作者单位】： 大连理工大学海岸和近海工程国家重点实验室;绍兴文理学院土木工程学院;中国石油化工股份有限公司胜利油田分公司石油工程技术研究院;
【基金】：国家自然科学基金资助项目(51479024) 国家重点基础研究发展计划(973)项目(2014CB047103) 安徽省科技计划项目(1604a0802109)~~
【分类号】：TE311
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