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《Journal of Southwest Petroleum Institute》 2006-04
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A STUDY ON THE MECHANICS OF POROUS MEDIUM EFFECTING THE DEW POINT OF GAS CONDENSATE RESERVOIR

DU Jian-fen(Central Sichuan Oil and Gas Field,Southwest Oil and Gas Field Branch,PCL,Chengdu Sichuan 610500,China),LI Shi-lun,YIN Yong-fei,et al.  
In the paper,the interfacial phenomena and their relations are analyzed,and the mechanisms of porous media influencing on dew point are studied.It is concluded that porous media affecting dew point is characterized by capillary condensation and gas adsorption,and the influencing degree is dependent on the fluid composition,status and the pore structure characters.Both capillary condensation and gas adsorption make dew point pressure increase.Rich gas condensate reservoir is strongly affected by adsorption,and the increase degree of dew point is high.The smaller the pore radius is,the stronger the effect of capillary condensation is,and the higher the increase degree of dew point is,and when the pore radius is less than 5×10~(-6)cm,the influence of capillary condensation can′t be neglected.For low permeability gas reservoir,the proportion of adsorbed fluid in total gas is relatively high,and the influence of adsorption is strong.The higher the difference between the initial formation pressure and the dew point pressure is,the stronger the effect of adsorption is.For the same system,the higher the reservoir temperature is,the smaller the changes in dew point pressure caused by adsorption and capillary condensation.
【Fund】: “油气藏地质及开发工程”国家重点实验室开放基金项目(PLN0116)
【CateGory Index】: TE37
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