Altering wettability to recover more oil from tight formations

Patrick V. Brady , Charles R. Bryan , Geoffrey Thyne , Huina Li
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引用次数: 32

Abstract

We describe here a method for modifying the bulk composition (pH, salinity, hardness) of fracturing fluids and overflushes to modify wettability and increase oil recovery from tight formations. Oil wetting of tight formations is usually controlled by adhesion to illite, kerogen, or both; adhesion to carbonate minerals may also play a role when clays are minor. Oil-illite adhesion is sensitive to salinity, dissolved divalent cation content, and pH. We measure adhesion between middle Bakken formation oil and core to verify a surface complexation model of reservoir wettability. The agreement between the model and experiments suggests that wettability trends in tight formations can be quantitatively predicted and that the bulk compositions of fracturing fluid and overflush compositions might be individually tailored to increase oil recovery.

改变润湿性,从致密地层中开采更多石油
本文描述了一种改变压裂液和溢流液的总体成分(pH、盐度、硬度)的方法,以改变润湿性,提高致密地层的采收率。致密地层的油润湿通常由与伊利石、干酪根或两者的粘附控制;粘着碳酸盐矿物也可能起作用,当粘土是次要的。油-伊利石黏附对矿化度、溶解二价阳离子含量和ph值都很敏感。为了验证储层润湿性的表面络合模型,我们测量了Bakken中地层油与岩心之间的黏附。模型与实验的一致性表明,致密地层的润湿性趋势可以定量预测,压裂液的总体成分和溢流成分可以单独定制,以提高采收率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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