凝析油临界含油饱和度定量表征新方法

发布时间：2018-11-24 14:34

【摘要】：为定量表征多孔介质中凝析油临界含油饱和度,建立临界流动条件下气-液-固界面发生形变时对应的凝析油膜及凝析油段塞的力学模型.基于随机分形微观孔隙网络模型,动态模拟凝析油微观分布特征,模拟多孔介质中各因素对凝析油临界含油饱和度的影响.研究表明,采用建立的新型微观网络动态模拟方法可以较准确地定量计算凝析油临界含油饱和度,模拟表征凝析油的微观分布规律.凝析油临界含油饱和度随着平均孔隙半径的增大而减小,随着分形维数的增大而增大;凝析油气界面张力对临界含油饱和度的影响趋势存在一个临界值.当界面张力小于该临界值时,随着界面张力增加凝析油临界含油饱和度大幅增加;当界面张力大于该值后,临界含油饱和度值增幅减低;毛管准数越大凝析油临界含油饱和度越小.凝析油临界含油饱和度值受静态和动态参数影响,在凝析气藏开发过程中,通过控制合理生产压差降低凝析油临界含油饱和度,对提高凝析气井产能是一种有效途径.
[Abstract]:In order to quantitatively characterize the critical oil saturation of condensate oil in porous media, a mechanical model of condensate film and slug corresponding to the deformation of gas-liquid-solid interface under critical flow conditions was established. Based on the random fractal micropore network model, the microcosmic distribution characteristics of condensate oil were dynamically simulated, and the effects of various factors in porous media on the critical oil saturation of condensate oil were simulated. The results show that the new micro network dynamic simulation method can be used to calculate the critical oil saturation of condensate oil accurately and quantitatively, and to characterize the microscopic distribution of condensate oil. The critical oil saturation of condensate oil decreases with the increase of mean pore radius and increases with the increase of fractal dimension, and there is a critical value for the effect of interfacial tension of condensate oil and gas on critical oil saturation. When the interfacial tension is less than the critical value, the critical oil saturation of condensate increases significantly with the increase of interfacial tension, and the increase of critical oil saturation decreases when the interfacial tension is greater than the critical value. The larger the capillary number, the smaller the critical oil saturation of condensate. The critical oil saturation value of condensate oil is affected by static and dynamic parameters. During the development of condensate gas reservoir, it is an effective way to improve the productivity of condensate gas well by controlling the reasonable production pressure difference to reduce the critical oil saturation of condensate oil.
【作者单位】：长江大学油气资源与勘探技术教育部重点实验室;长江大学石油工程学院;中国石油新疆油田分公司新港公司;
【基金】：国家自然科学基金资助项目(51504039)~~
【分类号】：TE319

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