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科技导报  2015 

纤维暂堵人工裂缝附加压差影响因素分析

DOI: 10.3981/j.issn.1000-7857.2015.22.012, PP. 73-77

Keywords: 纤维,转向压裂,数学模型,滤饼表皮因子,附加压差

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Abstract:

地层温度条件下自动可降解纤维能有效暂堵已形成的人工裂缝或天然裂缝,大幅提高缝内净压力,从而迫使人工裂缝发生转向,从其他方向启裂与扩展,增加油气藏改造体积。此时纤维在裂缝内形成滤饼填充带,形成一附加压差。理解纤维暂堵人工裂缝附加压差的影响因素,是优化纤维暂堵转向压裂设计关键参数的基础。由于缝内纤维滤饼引起附加压差影响因素众多,纤维转向压裂关键参数优化难度较大,本研究以纤维暂堵人工裂缝的物理模型为基础,利用经典水力压裂理论,推导并求解纤维滤饼附加压差的数学模型,模拟计算其影响因素的变化规律。模拟结果表明,较低排量、较小裂缝宽度和较高黏度有利于增大附加压差,加强纤维封堵裂缝的效果。结合裂缝延伸准则,得出井底压力增量与附加纤维滤饼长度两者成线性增加关系。

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