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ARTICLE

Numerical Study on Rock Breaking Mechanism of Supercritical CO₂ Jet Based on Smoothed Particle Hydrodynamics

by Xiaofeng Yang, Yanhong Li, Aiguo Nie, Sheng Zhi, Liyuan Liu

1 School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, China.
2 Department of Energy and Mineral Engineering, EMS Energy Institute and G3 Center, Pennsylvania State University, University Park, State College, PA 16802, USA.
3 School of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing, China.

* Corresponding Author: Xiaofeng Yang. Email: .

(This article belongs to the Special Issue: Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)

Computer Modeling in Engineering & Sciences 2020, 122(3), 1141-1157. https://doi.org/10.32604/cmes.2020.08538

Received 07 September 2019; Accepted 17 December 2019; Issue published 01 March 2020

Abstract

Supercritical carbon dioxide (Sc-CO₂) jet rock breaking is a nonlinear impact dynamics problem involving many factors. Considering the complexity of the physical properties of the Sc-CO₂ jet and the mesh distortion problem in dealing with large deformation problems using the finite element method, the smoothed particle hydrodynamics (SPH) method is used to simulate and analyze the rock breaking process by Sc-CO₂ jet based on the derivation of the jet velocity-density evolution mathematical model. The results indicate that there exisits an optimal rock breaking temperature by Sc-CO₂. The volume and length of the rock fracture increase with the rising of the jet temperature but falls when the jet temperature exceeds 340 K. With more complicated perforation shapes and larger fracture volumes, the Sc-CO₂ jet can yield a rock breaking more effectively than water jet, The stress analysis shows that the Sc-CO₂ rock fracturing process could be reasonably divided into three stages, namely the fracture accumulation stage, the rapid failure stage, and the breaking stabilization stage. The high diffusivity of Sc-CO₂ is identified as the primary cause of the stress fluctuation and W-shaped fracture morphology. The simulated and calculated results are generally in conformity with the published experimental data. This study provides theoretical guidance for further study on Sc-CO₂ fracturing mechanism and rock breaking efficiency.

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