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Influence of wettability and permeability heterogeneity on miscible CO2 flooding efficiency

机译：润湿性和渗透性非均质性对混溶性CO2驱油效率的影响

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CO2 flooding is a proven enhanced oil recovery (EOR) technique and is also considered as a potential method for CO2 sequestration. Despite having successful field trials on CO2 EOR, the effects of reservoir wettability and permeability heterogeneity on the efficiency of miscible CO2 flooding are not well understood. In this work, laboratory investigations have been carried out to evaluate the influence of these properties on the miscible CO2 EOR performance. The wettability of hydrophilic Berea core samples was altered to be oil-wet by vacuum saturation of the clean and dry core samples with n-hexadecane. The permeability heterogeneity was obtained by combining two half pieces of axially split water-wet core samples of different permeabilities. Core flooding experiments were conducted for n-hexadecane - synthetic brine - CO2 systems at 1400 psig backpressure to achieve minimum miscibility pressure (MMP) of CO2 in n-hexadecane at the test temperature (24 +/- 1 degrees C). It was found that wettability strongly influences CO2 EOR. For the alternate cases of previously brine flooded (to remaining oil saturation) oilwet and water-wet core samples, five pore volumes (PVs) of CO2 recovered 100% and only 43% of remaining oil in place (ROIP) respectively. Three PVs of CO2 could recover only about 0-5% ROIP from the split core samples. The mechanisms underlying these results are discussed. This study sheds light on the significant influence of reservoir wettability and permeability heterogeneity on the performance of miscible CO2 EOR. (C) 2015 Elsevier Ltd. All rights reserved.
机译：二氧化碳驱是一种经过验证的提高采油率（EOR）的技术，也被认为是潜在的二氧化碳封存方法。尽管已成功进行了CO2 EOR的现场试验，但对储层润湿性和渗透性非均质性对可混溶CO2驱油效率的影响尚不十分清楚。在这项工作中，已经进行了实验室研究以评估这些性质对可混溶CO2 EOR性能的影响。通过用正十六烷对干净和干燥的岩心样品进行真空饱和，将亲水性Berea岩心样品的润湿性更改为油润湿。渗透率非均质性是通过将两个半个不同渗透率的轴向裂开的水湿岩心样品组合而获得的。在1600 psig背压下对正十六烷-合成盐水-CO2系统进行岩心驱油实验，以在测试温度（24 +/- 1摄氏度）下实现正十六烷中CO2的最小混溶压力（MMP）。发现润湿性强烈影响CO 2 EOR。对于先前充满盐水（至剩余油饱和度）的油湿岩心和水湿岩心样本的替代情况，五个孔隙体积（PVs）的CO2分别回收了100％的现存油（ROIP）和43％的现存油。二氧化碳的三个PV只能从裂开的岩心样品中回收约0-5％的ROIP。讨论了这些结果的基础机制。这项研究揭示了储层润湿性和渗透率非均质性对可混溶CO2驱油性能的重大影响。 （C）2015 Elsevier Ltd.保留所有权利。

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