新疆石油地质

新疆石油地质 ›› 2007, Vol. 28 ›› Issue (3): 337-340.

• 油藏工程 • 上一篇    下一篇

变形介质中毛细管压力对凝析气藏相态的影响

杨小松1, 孙雷2, 孙良田2, 刘传喜1, 王卫红1   

  1. 1.中国石化 石油勘探开发研究院, 北京 100083;
    2.西南石油大学 油气藏地质及开发工程国家重点实验室, 成都 610500
  • 收稿日期:2006-11-01 修回日期:2006-12-18 出版日期:2007-06-01 发布日期:2020-07-31
  • 作者简介:杨小松(1976-), 男, 四川乐至人, 博士, 油气田开发工程,(Tel) 13436368635(E-mail) xiaoshong8@163.com.

Effect of Capillary Pressure in Deformable Media on Phase Behavior of Condensate Gas Reservoir

YANG Xiao-song1, SUN Lei2, SUN Liang-tian2, LIU Chuan-xi1, WANG Wei-hong1   

  1. 1. Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2006-11-01 Revised:2006-12-18 Online:2007-06-01 Published:2020-07-31

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摘要： 低渗凝析气藏在开采过程中,随着地层压力的降低,储集层会发生变形,孔隙半径会随有效应力的增大而减小,毛细管压力效应会随孔隙半径的改变而发生变化。为研究毛细管压力对凝析气藏相态的影响,定量分析了储集层变形对平均孔隙半径的影响,建立了同时考虑储集层变形和毛细管压力影响的相平衡数学模型,模拟了一个凝析气藏露点和等组成膨胀过程的相态特征,研究结果表明,变形介质中毛细管压力对凝析油气相态特征的影响比无变形多孔介质中的影响更强,应当考虑变形介质中毛细管压力对液相压力、反凝析液饱和度、液相摩尔含量等产生的影响(对液相压力的影响尤为明显)。在相态特征分析和组成分析的基础上,剖析了毛细管压力对凝析油气相平衡过程的作用机理。

关键词: 变形, 介质, 毛细管压力, 相态, 凝析油气田

Abstract: In the process of exploitation of low permeability condensate gas reservoir, the reservoir deformation will occur with the formation pressure decline; the average pore radius will decrease with the effective stress increase, and the capillary pressure effect will change with the pore radius variation. This paper quantitatively analyzes effect of the reservoir deformation on the average pore radius, develops the phase equilibrium mathematical model considering the effects of both the reservoir deformation and the capillary pressure, and then simulates the dew point pressure and phase behavior of constant composition expansion in a condensate gas reservoir. It is concluded that the effect of capillary pressure on phase behavior in distortional media is greater than that in porous media without distortion; the effects of capillary pressure on liquid phase pressure, retrograde condensed liquid saturation and liquid mole fraction in distortional media should be considered, especially, the effect capillary pressure on liquid phase pressure is prominent and should be considered. This paper also discusses the mechanism of the effect of capillary pressure on gas condensate phase equilibrium process, based on the analysis of the phase behavior and the composition.

Key words: distortion, deformation, medium, capillary pressure, phase state, gas condensate field

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