粒度分布对胶结砂岩力学特性的影响
发布时间：2018-10-05 20:26
【摘要】：储层出砂过程中砂岩颗粒的离散与其细观结构性有密切关系。以胶结砂岩为研究对象,基于三维颗粒流数值模型(PFC3D)建立4种不同粒度分布的数值模型,模拟剪切过程的砂岩力学响应,研究不同粒度分布的砂岩体应力比、体应变、配位数和黏结破坏与轴应变之间的关系。结果表明:粒度分布对砂岩力学特性的影响较大,仅基于随机方法产生颗粒建立的数值模型不能完全代表实际砂岩的物理结构。须根据实测的砂岩粒度分布建立三维数值模型,才能准确描述储层砂岩的力学特性。粒径越小,连接的颗粒越少,自由度越大,开采中成为离散颗粒的可能性越大。
[Abstract]:The dispersion of sandstone grain is closely related to its meso-structure during sand production. Based on three dimensional particle flow numerical model (PFC3D), four different particle size distribution numerical models were established to simulate the mechanical response of sandstone in shear process, and the stress ratio and volume strain of sandstone with different grain size distribution were studied. The relationship between coordination number and bond failure and axial strain. The results show that the particle size distribution has a great influence on the mechanical properties of sandstone, and the numerical model based on the random method can not represent the physical structure of the actual sandstone. In order to accurately describe the mechanical properties of reservoir sandstone, a three-dimensional numerical model must be established according to the measured grain size distribution of sandstone. The smaller the particle size is, the less the connected particles are and the greater the degree of freedom is, the greater the possibility of becoming discrete particles in mining.
【作者单位】： 重庆大学土木工程学院;重庆大学山地城镇建设与新技术教育部重点实验室;
【基金】：国家重点基础研究发展计划“973”项目(2014CB046903) 国家自然科学基金项目(51478065,51109231) 中央高校基本科研业务费项目(106112013CDJZR200004,106112014CDJZR200014)
【分类号】：TU452
[Abstract]:The dispersion of sandstone grain is closely related to its meso-structure during sand production. Based on three dimensional particle flow numerical model (PFC3D), four different particle size distribution numerical models were established to simulate the mechanical response of sandstone in shear process, and the stress ratio and volume strain of sandstone with different grain size distribution were studied. The relationship between coordination number and bond failure and axial strain. The results show that the particle size distribution has a great influence on the mechanical properties of sandstone, and the numerical model based on the random method can not represent the physical structure of the actual sandstone. In order to accurately describe the mechanical properties of reservoir sandstone, a three-dimensional numerical model must be established according to the measured grain size distribution of sandstone. The smaller the particle size is, the less the connected particles are and the greater the degree of freedom is, the greater the possibility of becoming discrete particles in mining.
【作者单位】： 重庆大学土木工程学院;重庆大学山地城镇建设与新技术教育部重点实验室;
【基金】：国家重点基础研究发展计划“973”项目(2014CB046903) 国家自然科学基金项目(51478065,51109231) 中央高校基本科研业务费项目(106112013CDJZR200004,106112014CDJZR200014)
【分类号】：TU452
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