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科技导报  2014 

微圆管中流体的微观流动机制

DOI: 10.3981/j.issn.1000-7857.2014.27.003, PP. 23-27

Keywords: 低渗透,微圆管,微流动,启动压力梯度

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Abstract:

针对低渗透油藏储层孔隙喉道小的特点,采用管径为20、15、10、5μm的微圆管,以去离子水和煤油为流动介质,研究微圆管中流体的微观流动规律,分析去离子水和煤油的实验流速、有效边界层厚度与压力梯度的关系,考察壁面润湿性和流体黏度对微流动规律的影响。研究表明,微管中流体流速与压力梯度基本成线性关系,随着微管管径的减小,流体流动的非线性程度增强,且驱动压力越大,微管有效边界层厚度越小,参与流动的流体更多,有效流体边界层厚度占微管管径的比例也随之降低;微管壁面由亲水性变为疏水性后,流体流速均高于改性前,微管管径越大,作用效果越显著;改变流体黏度时,出现明显的启动压力梯度特征,实验流体黏度从2.40mPa·s增至10.20mPa·s时,对应的启动压力梯度由1.26MPa/m增加到6.83MPa/m。

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