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Study on effect of porous media on dew point pressure of condensate gas

WU Xiao-dong1,LV Yan-ping1,MA Huan-ying2,LI Liang-wen3,FENG Hu1 (1.Oil and Gas Engineering Institute of China University of Petroleum,Beijing 102249;2.China National Offshore Oilfield Service Ltd.,Sanhe 101149,China;3.Erlian Branch Company of Huabei Oilfield,Xilinhaote 026017,China)  
For the effect of porous media on dew point pressure of condensate gas,different researchers have different or even contrary conclusions.Up to now,there is no theory that can well explain this contradictory phenomenon.Based on a large amount of research on effect of porous media on phase change in condensate gas reservoir,and experimental research is carried out and result shows that porous media has effect on dew point pressure of condensate gas.Two theoretical models for dew point pressure calculation are established,one of which considers effect of capillary pressure and the other considers adsorption in porous media.Calculations are performed for condensate gas of Baimiao and Qiaokou blocks in Zhongyuan Oilfield and simulated condensate gas fluid.Result shows that capillary pressure and adsorption phenomenon have effects on dew point pressure of condensate gas
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