A pore shape approximation method applied in jet breaking rock

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 245-252.

MA Xiaojing, ZHOU Xinchao, XIAO Xinpeng, CHENG Can

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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.

Key words

Pore shape approximation / SPH method / Pore size / Pore structure / Jet rock breaking

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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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