This analysis reveals rock-breaking efficiency increases with crack characteristics, suggesting novel approaches in nonlinear engineering and materials science.
The pulsed water jet (PWJ) rock-breaking technology is vital in developing oil and gas resources. The presence of fractures in the rocks in the reservoir is one of the prominent features in the renovation project of the old well. However, the dynamic damage process of cracked rocks under the action of PWJ has not yet been revealed. Therefore, from the perspective of nonlinear engineering, in this study, a new PWJ coupled rock-breaking model was established by using the smooth particle fluid dynamics-finite element method (SPH-FEM) coupling algorithm to clarify the macroscopic damage mechanism of rocks with crack characteristics. From the perspective of materials science, this study verified the reliability of the model through comparative experiments and investigated the failure mechanism induced by the impact of pulsed jets on rocks containing natural fractures. The experimental and simulation results illustrate that the rock-breaking effect of the PWJ is significantly superior to that of continuous water jet, combined with the theoretical framework of nonlinear engineering and materials science. The presence of cracks hinders the propagation of the stress waves. At a crack inclination angle of 75°, the broken pit depth increased by approximately 48.5% compared to 30°. The significant improvement in rock-breaking efficiency is closely related to crack spacing, especially when the spacing is less than 2 cm.
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Chen et al. (2025) studied this question.