一种应用于射流破岩的孔隙形状近似法

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (17) : 245-252.

论文

一种应用于射流破岩的孔隙形状近似法

马小晶，周新超，肖新朋，程璨

作者信息 +

A pore shape approximation method applied in jet breaking rock

MA Xiaojing, ZHOU Xinchao, XIAO Xinpeng, CHENG Can

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文章历史 +

摘要

为了精准模拟油气资源开采领域中射流破碎孔隙岩体的动态过程，构建准确且有效的孔隙岩体是十分关键的。基于光滑粒子流体动力学（Smoothed Particle Hydrodynamics, SPH）方法，提出了一种孔隙形状近似法（Pore Shape Approximation, PSA）。通过模拟孔隙岩体的单轴压缩试验，验证了PSA方法所构建的孔隙岩体模型与实验结果具有较好的相似性，通过引入描述水射流和岩体力学特性的本构方程，建立了射流冲击孔隙岩体的数值模型，并与数字岩心技术进行了对比，该模型具有较好的计算效率和稳定性。随后，分析了孔隙形状、尺寸和不同形状孔隙占比对岩体破损的影响。研究表明，不同形状的孔隙均存在一个使岩体破损效果最佳的尺寸；含薄片体、正三棱柱或正三角锥的孔隙岩体更容易破损，这三种孔隙的占比越高，岩体破损效果越明显。

Abstract

In order to accurately simulate the dynamic process of jet fracturing of porous rock in the field of oil and gas resource exploitation, it is crucial to build an accurate and effective porous rock .Based on the Smoothed Particle Hydrodynamics (SPH) method, a pore shape approximation (PSA) method for constructing porous rock is proposed. Through the uniaxial compression test of simulated porous rock , it is verified that the porous rock model constructed by PSA method has good similarity with the experimental results, and the constitutive equation describing the mechanical properties of water jet and rock is introduced. The numerical model of jet impacting on porous rock is established and compared with the digital core technology. The results show that the model has good computational efficiency and stability.The influence of pore shape, pore size and pore ratio of different shapes on rock damage is analyzed.The simulation results show that there is a size for the best damage effect of rock with different shapes of pores; Porous rock containing thin slices, regular triangular prism or regular triangular cone is more likely to be damaged. The higher the proportion of these three kinds of pores, the more obvious the damage effect of rock.

导出引用

马小晶，周新超，肖新朋，程璨. 一种应用于射流破岩的孔隙形状近似法[J]. 振动与冲击, 2023, 42(17): 245-252

MA Xiaojing, ZHOU Xinchao, XIAO Xinpeng, CHENG Can. A pore shape approximation method applied in jet breaking rock[J]. Journal of Vibration and Shock, 2023, 42(17): 245-252

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