超临界CO2直旋混合射流破岩机理及喷嘴结构影响规律

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (1) : 232-242.

土木工程

超临界CO2直旋混合射流破岩机理及喷嘴结构影响规律

薛永志，李俊*，丁亮亮，罗旺，赵耀

作者信息 +

Rock breaking mechanism of supercritical CO2 straight-swirling mixed jet and influences of nozzle structure

XUE Yongzhi, LI Jun*, DING Liangliang, LUO Wang, ZHAO Yao

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文章历史 +

摘要

超临界CO2直旋混合射流综合了超临界CO2射流和直旋混合射流的技术优势，是油气资源勘探开发的新型破岩工具。基于流-固-热耦合理论，建立了超临界CO2直旋混合射流破岩的三维计算模型，研究了超临界CO2直旋混合射流破岩机理。结果表明，超临界CO2直旋混合射流兼具正向冲击、径向张力、周向剪力和热应力作用；热应力的存在显著提升岩石所受的Mises应力，但增幅会随冲击时间的延续而变弱。将冲蚀作用和漫流作用作为重要参量，分析了不同喷嘴结构参数对射流流场特性的影响。发现螺旋槽开口角度为45°，中心孔直径为2 mm，螺旋槽个数为4个和叶轮螺旋角度为60°时，射流的流场特性呈最优状态。研究结果可为超临界CO2直旋混合射流的优化应用提供参考。

Abstract

Straight-swirling mixed supercritical CO2 (SS-SC-CO2) jet is a new rock-breaking tool for oil and gas exploration and development that combines the technical advantages of SC-CO2 jet and straight-swirling mixed jet. A three-dimensional computational model of the SS-SC-CO2 jet rock-breaking was established based on the theory of fluid-solid-thermal coupling. The mechanism of SS-SC-CO2 jet rock-breaking was studied. The results show that the SS-SC-CO2 jet combines axial impact, radial tension, circumferential shear, and thermal stress; the existence of thermal stress increases the Mises stress of rock, but the increase decreases with the extension of impact time. The effects of different nozzle structural parameters on the jet flow field characteristics were analyzed by taking the erosion and diffusion effects as important references. The optimal flow field characteristics of the jet are achieved when the spiral groove opening angle is 45°, the diameter of the center hole is 2 mm, the number of spiral grooves is 4, and the impeller spiral angle is 60°. The study results provide a reference for optimizing the application of SS-SC-CO2 jets.

导出引用

薛永志, 李俊, 丁亮亮, 罗旺, 赵耀. 超临界CO2直旋混合射流破岩机理及喷嘴结构影响规律[J]. 振动与冲击, 2025, 44(1): 232-242

XUE Yongzhi, LI Jun, DING Liangliang, LUO Wang, ZHAO Yao. Rock breaking mechanism of supercritical CO2 straight-swirling mixed jet and influences of nozzle structure[J]. Journal of Vibration and Shock, 2025, 44(1): 232-242

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