超临界二氧化碳射流冲击压力参数影响规律  

Impact pressure and parametric sensitivity analysis of supercritical CO_2 jet

作　　者：程宇雄[1] 李根生[1] 沈忠厚[1] 王海柱[1] 李敬彬[1] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249

出　　处：《石油学报》2014年第4期765-770,共6页Acta Petrolei Sinica

基　　金：国家自然科学基金创新研究群体项目(No.51221003)和国家自然科学基金重大国际(地区)合作项目(No.51210006)资助

摘　　要：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。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 supereritical CO2 jet and water jet, followed by a parametric sensitivity analysis. The results show that supereritical CO, 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.

关 键 词：超临界二氧化碳 水射流 冲击压力 流场 数值模拟 

分 类 号：TE242.6[石油与天然气工程—油气井工程]