The staged fracturing of horizontal wells is an effective method for the development of shale oil.During the fracturing process,long-term operation under high pump pressure and high sand volume conditions leads to erosion of the casing holes,resulting in thinning of the casing wall thickness and uneven reaming at the hole.To address this issue,a numerical simulation study of liquid-solid two-phase flow for casing hole erosion is conducted using the CFD-DDPM method.In this study,the erosion mechanism of casing hole in the process of close-cut volume fractu-ring is analyzed,and the erosion law of perforation hole and its adjacent area under the influence of different perfora-tion angles,sand content,inlet velocity and particle size is studied.The results show that with the increase of casing perforation angle,the maximum erosion rate at the hole opening exhibits a"tooth"shape variation;with the increase of sand content and inlet velocity,the maximum erosion rate increases gradually,and the erosion area on the inner wall of the pipeline also significantly increases;with the increase of particle size,the maximum erosion rate decreases first and then increases.The numerical simulation of liquid-solid two-phase flow for casing hole erosion based on CFD-DDPM method reveals the mechanism of hole erosion during staged fracturing,which has significant guiding for balanced fracture initiation and extending tool lifespan.
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