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| Flow characteristics of high pressure real gas in microtubes |
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ZHAO Qing-min1,YUE Xiang-an1,WANG Fei2,SUN Kan3,ZHANG Yu4
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(1. MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249，China;2. Research Institute of Geological Exploration and Development, Chuanqing Drilling Engineering Company Limited, Chengdu 610051， China;3. Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China ;4. 3th Oil Production Plant, Daqing Oilfield Company Limited, Daqing 163113，China)
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| Abstract: |
| The flow characteristics of nitrogen in microtubes with diameters of 14. 9, 10. 1，5. 03 and 2. 05 (Jim were investigated experimentally under high pressure condition. Based on capillary bundle model, the gaseous seepage properties in low-permeability 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 jjum are in accordance with the classical fluid mechanics theoiy. 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, moreover ，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. |
| Key words: high pressure gas microtube high pressure microscale effect capillary bundle model non-Darcy's flow flow characteristic |
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