西南石油大学学报(自然科学版) ›› 2006, Vol. 28 ›› Issue (4): 26-28.DOI: 10.3863/j.issn.1000-2634.2006.04.007

• 石油与天然气工程 • 上一篇    下一篇

多孔介质对凝析气藏露点的影响机理研究

杜建芬1 李士伦1 尹永飞2 崔丽春3 熊波4 杨晓敏4
  

  1. 1.西南石油大学石油工程学院,四川成都610500; 2.川中油气矿; 3.长庆油田分公司第一采气厂; 4.川东北气矿
  • 收稿日期:2005-06-07 修回日期:1900-01-01 出版日期:2006-08-20 发布日期:2006-08-20

A STUDY ON THE MECHANICS OF POROUSMEDIUM EFFECTING THE DEW PO INT OF GAS CONDENSATE RESERVO IR

DU Jian-fen LI Shi-lun IN Yong-fei et al   

  1. CentralSichuanOilandGasField, Southwestv and Gas Field Branch, PCL, Chengdu Sichuan 610500,China
  • Received:2005-06-07 Revised:1900-01-01 Online:2006-08-20 Published:2006-08-20

摘要: 分析了多孔介质中的各种界面现象以及它们之间的相互关系,并分析了多孔介质影响凝析气藏露点的机理。认为,多孔介质对凝析气藏露点的影响体现在毛细凝聚和气体吸附的共同作用,由气藏流体的组成、状态及储集层的孔隙结构特征决定:多孔介质中的毛细凝聚和气体吸附均使得露点压力升高;富含凝析油的凝析气藏受吸附作用的影响较强,露点值升高的幅度相对较大;储层孔隙半径r越小,毛细凝聚作用的影响越强,露点值升高的幅度越大,当孔隙半径r<5×10-6cm时,毛细凝聚现象对露点的影响已不能忽略;对于低渗气藏,吸附态气体在总气量中所占的比重相对较大,吸附产生的影响相应也会增强;地露压差越大,吸附作用的影响越强;相同体系储层温度越高,由吸附和毛细凝聚引起的露点变化越小。

关键词: 多孔介质, 凝析气藏, 气体吸附, 毛细凝聚, 露点, 界面现象

Abstract: 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 porousmedia 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 ofdew point is high. The smaller the pore radius is, the stronger the effect of capillary condensation is, and the higher the increase degree ofdew point is, andwhen the pore radius is less than 5×10-6cm, 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 pointpressure is, the stronger the effect of adsorption is. For the same system, the higher the reservoir tempera
ture is, the smaller the changes in dew pointpressure caused by adsorption and capillary condensation.

Key words: porousmedium, gas condensate reservoir, adsorption, dew point pressure, capillary condensation, Interfacial Phenomenon

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