【摘要】：儲層出砂過程中砂巖顆粒的離散與其細(xì)觀結(jié)構(gòu)性有密切關(guān)系。以膠結(jié)砂巖為研究對象,基于三維顆粒流數(shù)值模型(PFC3D)建立4種不同粒度分布的數(shù)值模型,模擬剪切過程的砂巖力學(xué)響應(yīng),研究不同粒度分布的砂巖體應(yīng)力比、體應(yīng)變、配位數(shù)和黏結(jié)破壞與軸應(yīng)變之間的關(guān)系。結(jié)果表明:粒度分布對砂巖力學(xué)特性的影響較大,僅基于隨機(jī)方法產(chǎn)生顆粒建立的數(shù)值模型不能完全代表實際砂巖的物理結(jié)構(gòu)。須根據(jù)實測的砂巖粒度分布建立三維數(shù)值模型,才能準(zhǔn)確描述儲層砂巖的力學(xué)特性。粒徑越小,連接的顆粒越少,自由度越大,開采中成為離散顆粒的可能性越大。
[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.
【作者單位】： 重慶大學(xué)土木工程學(xué)院;重慶大學(xué)山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點實驗室;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃“973”項目(2014CB046903) 國家自然科學(xué)基金項目(51478065,51109231) 中央高校基本科研業(yè)務(wù)費(fèi)項目(106112013CDJZR200004,106112014CDJZR200014)
【分類號】：TU452

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