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

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (1) : 232-242.

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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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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.

Key words

jet rock-breaking / supercritical CO2 / straight-swirling mixed jet / nozzle structure

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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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