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科技导报  2015 

考虑注水温度及储层堵塞的注水破裂压力计算

DOI: 10.3981/j.issn.1000-7857.2015.12.005, PP. 33-37

Keywords: 破裂压力,储层堵塞,注水温度,滤饼

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Abstract:

长期注水造成的储层温度变化和堵塞都会影响注水破裂压力。基于多孔介质弹性力学理论,得到了考虑储层温度变化及堵塞时的井壁处有效应力分布规律,建立了相应的注水破裂压力计算模型,并分析了储层温度变化及堵塞程度对注水破裂压力的影响规律。计算结果表明注水破裂压力随注水温度的降低而降低,且成线性变化关系,弹性模量和线膨胀系数越大,注水破裂压力的变化幅度越大;与储层内部的污染带相比,滤饼厚度及其渗透率对破裂压力的影响更大,随着滤饼厚度的增加及其渗透率的降低,破裂压力将会升高;井壁存在滤饼时,污染带范围的增加将降低破裂压力,而其渗透率对破裂压力则影响很小,当滤饼不存在时,储层内部污染带不会影响注水破裂压力。

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