高压气体在微圆管中的流动特性  

Flow characteristics of high pressure real gas in microtubes

作　　者：赵清民[1] 岳湘安[1] 王斐[2] 孙侃[3] 张羽[4] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]川庆钻探工程有限公司地质勘探开发研究院,四川成都610051 [3]中国石油塔里木油田勘探开发研究院,新疆库尔勒841000 [4]大庆油田有限责任公司第三采油厂,黑龙江大庆163113

出　　处：《中国石油大学学报（自然科学版）》2012年第4期129-133,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家“973”重点基础研究发展计划项目(2011CB707305);国家科技重大专项课题(2011ZX05009-004)

摘　　要：在高压条件下,试验研究氮气在直径为14.9、10.1、5.03、2.05μm微圆管中的流动特性。结合毛管束模型,研究气体的高压微尺度流动特性对气体在低渗多孔介质中渗流特性的影响。结果表明:气体在14.9μm微圆管中的高压流动特性与经典流体力学规律相符;随着管径的减小,气体的流动出现了明显的微尺度效应,表现为实测流量偏离经典流体力学理论预测流量,且管径越小,这种微尺度流动效应越显著;研究稀薄气体效应时提出的Kn数不能用来表征高压条件下气体的微尺度效应;气体在微小孔喉中的高压微尺度流动效应导致气体在低渗多孔介质中的渗流具有非达西渗流特征,表现为实际渗透率大于由经典H-P方程和达西公式计算的绝对渗透率。The flow characteristics of nitrogen in microtubes with diameters of 14. 9, 10. 1,5.03 and 2.05 μm were investigated experimentally under high pressure condition. Based on capillary bundle model, the gaseous seepage properties in lowpermeability porous media influenced by high pressure microscale flow characteristics were researched. The results show that the flow characteristics of high pressure nitrogen in microtube with the diameter of 14. 9 p^m are in accordance with the classi- cal fluid mechanics theory. However, with the decrease of the inner diameter of microtube, gas flow shows an apparent microscale effect and the experimental results depart from the theoretical predictions of the classical fluid mechanics theory, mo- reover, the smaller the diameter, the more obvious the microscale effect. Besides, the high pressure microscale effect can not be characterized by the Knudsen number, which is proposed for studying rarefaction effect. The gas seepage in low-permea- bility porous media has an obvious characteristic of non-Darcy＇s flow, and the real permeability is larger than absolute permeability calculated by classical H-P equation or Darcy＇s equation.

关 键 词：高压气体 微圆管 高压微尺度效应 毛管束模型 非达西渗流 流动特性 

分 类 号：TK124[动力工程及工程热物理—工程热物理]