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首页> 外文期刊>International Journal of Modern Physics, C. Physics and Computers >Fractal analysis of fracture increasing spontaneous imbibition in porous media with gas-saturated
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Fractal analysis of fracture increasing spontaneous imbibition in porous media with gas-saturated

机译：含气饱和多孔介质中裂缝自发吸收的分形分析

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摘要

Spontaneous imbibition (SI) of wetting liquid into matrix blocks due to capillary pressure is regarded as an important recovery mechanism in low permeability fractured reservoir. In this paper, an analytical model is proposed for characterizing SI horizontally from a single plane fracture into gas-saturated matrix blocks. The presented model is based on the fractal character of pores in porous matrix, with gravity force included in the entire imbibition process. The accumulated mass of wetting liquid imbibed into matrix blocks is related to a number of factors such as contact area, pore fractal dimension, tortuosity, maximum pore size, porosity, liquid density and viscosity, surface tension, contact angle, as well as height and tilt angle of the fracture. The mechanism of fracture-enhanced SI is analyzed accordingly. Because of the effect of fracture, the gravity force is positive to imbibition process. Additionally, the farther away from the fracture top of the pore, the more influential the hydrostatic pressure is upon the imbibition action. The presented fractal analysis of horizontal spontaneous imbibition from a single fracture could also shed light on the scaling study of the mass transfer function between matrix and fracture system of fractured reservoirs.
机译：毛细压力引起的润湿液自吸到基质块中被认为是低渗透裂缝性油藏的重要采收机理。在本文中，提出了一个分析模型，用于从单个平面裂缝到气体饱和的基质块中水平表征SI。提出的模型基于多孔基质中孔隙的分形特征，在整个吸收过程中都包含了重力。吸收到基质块中的润湿液的累积质量与许多因素有关，例如接触面积，孔隙分形维数，曲折度，最大孔径，孔隙率，液体密度和粘度，表面张力，接触角以及高度和骨折的倾斜角。相应地分析了增强SI断裂的机理。由于断裂的影响，重力对吸收过程是正的。另外，离孔的裂缝顶部越远，静水压力对吸水作用的影响越大。所提出的单个裂缝水平自吸的分形分析也可以为裂缝性储层的基质与裂缝系统之间的传质函数的定标研究提供参考。

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