混合润湿毛细管渗吸采油前缘特征研究

doi:10.12422/j.issn.1006-396X.2025.05.005

摘要/Abstract

摘要：

混合润湿毛细管静态渗吸前缘特征及其演化规律对预测复杂润湿致密油藏渗吸采油效果至关重要。通过建立混合润湿静态渗吸采油模型，研究了空间混合润湿分布和混合润湿程度对静态渗吸前缘距离变化以及界面变形特征的影响规律，明确了混合润湿毛细管内发生高效静态渗吸采油的临界条件。结果表明，水润湿分数越大，稳定静态渗吸前缘距离差值越小，达到最佳渗吸采油效果所需时间越短；两润湿侧壁接触角余弦差值越大，稳定静态渗吸前缘距离差值越大；基于模拟数据建立的静态渗吸前缘距离差值拟合公式，结合静态渗吸前缘距离解析解，可定量表征不同混合润湿毛细管静态渗吸前缘距离变化规律及界面变形特征。研究结果可为混合润湿致密油藏高效低碳开采提供理论指导。

关键词: 致密储层, 混合润湿, 静态渗吸, 前缘距离, 毛细管

Abstract:

The characteristics and evolution of the imbibition front during spontaneous oil recovery in mixed wetting capillaries are critical for predicting imbibition efficiency in tight oil reservoirs with complex wettability. By establishing a spontaneous imbibition model under mixed wetting conditions, this study investigates the influence of spatially heterogeneous wettability distribution and the degree of mixed wettability on the spontaneous imbibition front distance and the interfacial deformation behavior. The critical condition for achieving efficient spontaneous imbibition in mixed wetting capillarie is identified. A higher water-wetting fraction results in smaller differences in the stabilized static suction front edge distance, achieving optimal oil recovery time more efficiently. Conversely, a larger cosine difference in contact angles between wet and dry sidewalls leads to greater disparities in this critical parameter. By combining simulation data with a fitting formula for static suction front edge distance variations, combined with analytical solutions for the front distance, we can quantitatively characterize the dynamic patterns of front distance changes and interfacial deformation characteristics in mixed-wetting capillary systems. These findings provide theoretical support for efficient and low-carbon development strategies in mixed-wet tight oil reservoirs.

Key words: Tight oil, Mixed wetting, Spontaneous imbibition, Front distance, Capillary

中图分类号:

TE348

濮御, 杨二龙, 付世博. 混合润湿毛细管渗吸采油前缘特征研究[J]. 石油化工高等学校学报, 2025, 38(5): 39-47.

Yu PU, Erlong YANG, Shibo FU. Study on Imbibition Oil Recovery Front Characteristics of Mixed Wetting Capillary[J]. Journal of Petrochemical Universities, 2025, 38(5): 39-47.

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链接本文: https://journal.lnpu.edu.cn/syhg/CN/10.12422/j.issn.1006-396X.2025.05.005

https://journal.lnpu.edu.cn/syhg/CN/Y2025/V38/I5/39

图/表 10

图1 水平混合润湿毛细管的物理模型示意图

Fig.1 Schematic of the physical model of the horizontally mixed wetting capillary

图2 水润湿侧壁静态渗吸前缘距离理论解与数值解对比

Fig.2 Comparison of theoretical and numerical solutions for the static imbibition front distance on the wetted side of a wall

图3 不同混合润湿分布下毛细管两相对润湿侧壁静态渗吸前缘距离随渗吸时间的变化曲线

Fig.3 The variation curve of the static suction front distance between the two opposing wetting sidewalls of a capillary tube under different mixed wetting distributions with respect to suction time

图4 不同混合润湿分布下毛细管静态渗吸前缘距离差值随渗吸时间的变化曲线

Fig.4 The variation curve of the distance difference between the capillary static imbibition front edge and the imbibition time under the same mixed wetting distribution

图5 混合润湿毛细管稳定静态渗吸前缘距离差值随水润湿分数的变化曲线

Fig.5 The variation curve of the distance difference between the stable static imbibition front edge and the wetting fraction of water in a mixed wetting capillary

图6 不同混合润湿分布下混合润湿毛细管静态渗吸采油过程中的流体分布

Fig.6 Fluid distribution in spontaneous imbibition oil recovery process of mixed wetting capillaries under the different mixed wetting distributions

图7 不同接触角组合下对称混合润湿毛细管两相对润湿侧壁静态渗吸前缘距离随渗吸时间的变化曲线

Fig.7 The variation curve of the static suction leading edge distance between two opposing wetting sidewalls of a symmetric mixed wetting capillary under different contact angle combinations with respect to suction time

图8 不同接触角组合下对称混合润湿毛细管两相对湿润侧壁静态渗吸前缘距离差值随渗吸时间的变化曲线

Fig.8 The variation curve of the distance difference between the static suction front edge on the two opposite wet sidewalls of a symmetric mixed wetting capillary with different contact angle combinations as a function of suction time

图9 对称混合润湿毛细管稳定静态渗吸前缘距离差值随两润湿侧壁接触角余弦差值的变化曲线

Fig.9 The variation curve of the distance difference between the stable static infiltration and suction front edge of the symmetrical mixed wetting capillary in kinetic models with the cosine difference of the contact angle between the two wetting sidewalls

图10 不同接触角组合下对称混合润湿毛细管静态渗吸采油过程中的流体分布

Fig.10 Fluid distribution in spontaneous imbibition oil recovery process of symmetric mixed wetting capillaries under different contact angle combinations

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