低渗分形多孔介质中油水两相不稳定流的相渗研究

xinmeng

低渗分形多孔介质中油水两相不稳定流的相渗研究

Ager,2018, 2(4): 369-379

原文网址：http://www.astp-agr.com/index.php/Index/Index/detail?id=77

  在低渗储层中，流体的流动不符合达西定律,流体开始流动存在最小启动压力梯度。目前对于油水两相流动相渗规律的研究大多基于稳态达西渗流理论，并没有考虑启动压力梯度和毛管力的影响。为了更好地认识低渗储层油水两相渗流规律，需要对低渗两相非达西非稳态渗流相对渗透率进行深入研究。

本文基于水驱油两相瞬态流分形模型（模型假定孔隙介质由许多大小各异的毛管束组成），建立了考虑启动压力梯度及毛管力影响的低渗岩心非稳态油水相对渗透率计算模型。该计算方法所涉及的所有参量均具有明确的物理意义而非经验常数，其计算预测值与实验实测值拟合程度较高。在此基础上，本文还讨论了影响相渗的敏感性参数对曲线形态的影响。通过本文的研究，能够对低渗透多孔介质中的瞬态两相流机理有更好的认识。

A study of relative permeability for transient two-phase flow in a low permeability fractal porous medium

Zhenglan Li, Yonggang Duan, Quantang Fang, Mingqiang Wei

(Published: 2018-08-03)

CorrespondingAuthor and Email: Yonggang Duan, nanchongdyg@163.com

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Citation: Li, Z., Duan, Y., Fang, Q., Wei, M. A study of relative permeability for transient two-phase flow in a low permeability fractal porous medium. Advances in Geo-Energy Research, 2018, 2(4): 369-379, doi: 10.26804/ager.2018.04.02.

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ArticleType: Original article

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Abstract：

    Based on the fractal approximation model that consists of a bundle of tortuous capillaries, a relative permeability prediction method considering the effects of capillary pressure and threshold pressure gradient in a low permeability fractal porous medium was established and analyzed. In this model, the empirical parameters were eliminated and replaced by the new parameters with clearer physical meaning. The simulating results were compared with the experimental data and show a good agreement. In addition to this, parameter analysis was implemented to investigate the influences of characteristic parameters (such as tortuosity fractal dimension, pore fractal dimension, ratio of minimum-maximum capillaries diameters and threshold pressure gradient) on the relative permeability. This study could be conducible to a better understanding of the mechanism for transient two-phase flow in the low permeability fractal porous medium.

Keywords: Fractal Theory; Transient Two-Phase Flow; Relative Permeability; Threshold Pressure Gradient.