超临界二氧化碳射流冲击压力参数影响规律

为了探明超临界CO_2射流对岩石冲击压力及其参数影响规律,利用计算流体力学模拟了超临界CO_2射流冲击的三维流场,对比了超临界CO_2射流和水射流的冲击压力,进行了参数影响规律研究。结果表明:在相同条件下,超临界CO_2射流能产生比水射流更强的冲击效果;超临界CO_2射流冲击压力随着喷嘴压降和喷嘴直径的增大而增大;随着喷距的增大,超临界CO_2射流的冲击压力降低,冲击范围扩大;围压和流体温度的变化对超临界CO_2射流冲击压力的强度和范围的影响极小,在工程应用中可以忽略。研究结果证实了超临界CO_2射流的冲击效果,探明了超临界CO_2射流冲击压力的参数影响规律,为超临界CO_2射流在钻完井工程中的应用提供了指导。

Impact pressure and parametric sensitivity analysis of supercritical CO2 jet

This study aimed to explore the impact pressure and parametric influences of supercritical CO₂ jet. Three-dimension flow fields of supercritical CO₂ jet were simulated using a computational fluid dynamic method. A comparative analysis of impact pressure was performed between supercritical CO₂ jet and water jet, followed by a parametric sensitivity analysis. The results show that supercritical CO₂ jet generates stronger impact pressure than water jet under the same conditions. With increasing nozzle pressure drop and nozzle diameter, the impact pressure of supercritical CO₂ jet increases. As the standoff distance increases, the impact pressure of supercritical CO₂ jet decreases while its impact scope increases. The confining pressure and fluid temperature have minor effects on the impact pressure and scope of supercritical CO₂ jet, which can be neglected in engineering applications. This study verifies the impact pressure of supercritical CO₂ jet and uncovers its parametric influences, thus providing guidance for the applications of supercritical CO₂ jet in well drilling and completion engineering.