abrasive supercritical CO₂ (SC-CO₂) jet perforation is the key procedure in the SC-CO₂ fracturing, which will directly affect the exploitation of oil and gas. The properties of the SC-CO₂ fluid, such as density, viscosity, diffusivity and so on, change greatly with the variation of temperature and pressure, which directly affect the particle-carrying ability and perforation performance. This paper investigates the influence of key parameters, such as ambient pressure, fluid temperature, jet standoff distance and jet pressure, on the perforation ability of abrasive SC-CO₂ jet. The results indicate that the ambient pressure has no significant effect on perforation under the condition of a fixed jet differential pressure. When the confining pressure increases from 5 to 15 MPa, the hole depth and diameter decrease by 5.7% and 18.6% respectively. The hole depth increases slightly with the rising of jet temperature. In addition, with the jet temperature rising per 20℃ within the range from 40 to 100℃ and the standoff distances being 4 to 10 mm, the hole depths increase by 3.8% and 12.0% in average, respectively. Furthermore, the hole depths keep unchanged at first and then decrease rapidly with the increasing standoff distance. However, the hole diameters and effectively impinged areas increase with the standoff distance. The influences of SC-CO₂ jet pressure on the perforation performance are similar to that of the conventional jet. Additonally, both effective hole depths and volumes increase linearly in general with the increasing of jet pressure. The hole depths averagely increase by 36.6% when the SC-CO₂ jet pressure rising by 5 MPa. Furthermore, the research also shows that perforation performance of pre-mixed jet is better than the post-mixed jet, the volume ratio of the two kinds of perforating holes is 12.02 under these experimental conditions. All the above merits have provided a theoretical foundation and experimental proven for the field application of SC-CO₂ jet perforation technology.

超临界CO ₂（SC-CO ₂）磨料射流射孔是SC-CO ₂压裂的关键步骤，它将直接影响油气的开采。SC-CO ₂流体的密度，粘度，扩散系数等特性会随温度和压力的变化而发生很大变化，直接影响颗粒的承载能力和射孔性能。本文研究了环境压力，流体温度，射流隔离距离和射流压力等关键参数对SC-CO ₂磨料穿孔性能的影响。喷射。结果表明，在固定射流压差条件下，环境压力对射孔没有显着影响。当围压从5 MPa增加到15 MPa时，孔深和直径分别减小5.7％和18.6％。孔深度随着射流温度的升高而略有增加。此外，随着射流温度每20℃在40到100℃之间升高，并且支座距离为4到10 mm，孔深平均分别增加3.8％和12.0％。此外，孔深度首先保持不变，然后随着间隔距离的增加而迅速减小。但是，孔的直径和有效撞击的区域会随着间隔距离的增加而增加。SC-CO ₂的影响射流压力对射孔性能的影响与常规射流相似。另外，有效孔的深度和体积通常随着射流压力的增加而线性增加。当SC-CO ₂喷射压力升高5 MPa时，孔深平均增加36.6％。此外，研究还表明，在这些实验条件下，预混射流的射孔性能优于后混射流，两种射孔的体积比为12.02。以上所有优点为SC-CO ₂射流射孔技术的现场应用提供了理论基础和实验证明。