Wettability Alteration in Carbonates using Zirconium Oxide Nanofluids: EOR Implications
Wettability Alteration in Carbonates using Zirconium Oxide Nanofluids: EOR Implications
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DOI：
10.1021/ef201475u
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发表时间：
2012-02-01
期刊：
影响因子：
5.3
通讯作者：
Arya, Sharareh
中科院分区：
文献类型：
--
作者：
Karimi, Ali;Fakhroueian, Zahra;Arya, Sharareh
润湿性蚀变是提高油湿型碳酸盐岩油藏采收率的重要手段。表面活性剂等化学试剂在碳酸盐体系中被称为润湿性改进剂。然而，这些试剂的有效性可以通过添加诸如聚合物、离子材料和纳米颗粒等化学物质来提高。纳米颗粒对碳酸盐体系润湿性的影响尚未被报道，而且还处于起步阶段。实验研究了zro2基纳米流体对碳酸盐岩储层润湿性蚀变的影响。用ZrO2纳米颗粒和非离子表面活性剂的混合物制备了几种纳米流体。通过测量接触角，研究了纳米流体对碳酸盐样品润湿性的影响，结果表明，设计的纳米流体可以显著改变岩石的润湿性，从强油湿状态转变为强水湿状态。扫描电子显微镜（SEM）图像和x射线衍射（XRD）数据验证了纳米颗粒在岩石上的吸附和纳米纹理表面的形成。此外，本文还报道了ZrO2纳米流体在饱和储油的油湿型岩心塞中的快速吸附作用。结果表明，通过将纳米流体自由吸附到岩心塞中，可以快速回收相当数量的石油。还提出了一种理论方法来解释复合纳米织构表面的形成对润湿性的改变。
Wettability alteration is an important method to increase oil recovery from oil-wet carbonate reservoirs. Chemical agents like surfactants are known as wettability modifiers in carbonate systems. However, the effectiveness of these agents can be increased by the addition of chemicals such as polymers, ionic materials, and nanopartides. The impacts of nanoparticles on the wettability of carbonate systems have not been reported yet, and it is still in its infancy. In this work, the effect of ZrO2-based nanofluids on the wettability alteration of a carbonate reservoir rock was experimentally studied. Several nanofluids were made composed of ZrO2 nanoparticles and mixtures of nonionic surfactants. The effect of nanofluids on the wettability of carbonate samples were investigated by measuring the contact angles, and it was shown that designed nanofluids could significantly change the wettability of the rock from a strongly oil-wet to a strongly water-wet condition. Scanning electron microscopy (SEM) images and X-ray Diffraction (XRD) data verify adsorption of nanoparticles on the rock and formation of nanotextured surfaces. Moreover, this paper reports the quick imbibitions of ZrO2 nanofluids into oil-wet core plugs saturated with stock tank oil. The results show that a considerable amount of oil can be quickly recovered by free imbibitions of the nanofluids into the core plugs. A theoretical approach is also presented to explain the wettability alteration by formation of composite nanotextured surfaces..