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孔隙尺寸分布对碳酸盐岩流动行为影响的洞察：将基于纳米的强化采油方法与岩石分类相联系

Insights into the Effects of Pore Size Distribution on the Flowing Behavior of Carbonate Rocks: Linking a Nano-Based Enhanced Oil Recovery Method to Rock Typing.

作者信息

Rezaei Amin, Abdollahi Hadi, Derikvand Zeinab, Hemmati-Sarapardeh Abdolhossein, Mosavi Amir, Nabipour Narjes

机构信息

Abdal Industrial Projects Management Co. (MAPSA), Tehran 1456914477, Iran.

Department of Petroleum Engineering, Science and Research Branch, Azad University, Tehran 1477893855, Iran.

出版信息

Nanomaterials (Basel). 2020 May 18;10(5):972. doi: 10.3390/nano10050972.

DOI:10.3390/nano10050972
PMID:32443641
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7712098/
Abstract

As a fixed reservoir rock property, pore throat size distribution (PSD) is known to affect the distribution of reservoir fluid saturation strongly. This study aims to investigate the relations between the PSD and the oil-water relative permeabilities of reservoir rock with a focus on the efficiency of surfactant-nanofluid flooding as an enhanced oil recovery (EOR) technique. For this purpose, mercury injection capillary pressure (MICP) tests were conducted on two core plugs with similar rock types (in respect to their flow zone index (FZI) values), which were selected among more than 20 core plugs, to examine the effectiveness of a surfactant-nanoparticle EOR method for reducing the amount of oil left behind after secondary core flooding experiments. Thus, interfacial tension (IFT) and contact angle measurements were carried out to determine the optimum concentrations of an anionic surfactant and silica nanoparticles (NPs) for core flooding experiments. Results of relative permeability tests showed that the PSDs could significantly affect the endpoints of the relative permeability curves, and a large amount of unswept oil could be recovered by flooding a mixture of the alpha olefin sulfonate (AOS) surfactant + silica NPs as an EOR solution. Results of core flooding tests indicated that the injection of AOS + NPs solution in tertiary mode could increase the post-water flooding oil recovery by up to 2.5% and 8.6% for the carbonate core plugs with homogeneous and heterogeneous PSDs, respectively.

摘要

作为一种固定的储层岩石属性，已知孔隙喉道尺寸分布（PSD）会强烈影响储层流体饱和度的分布。本研究旨在探讨PSD与储层岩石油水相对渗透率之间的关系，重点关注表面活性剂-纳米流体驱油作为一种提高采收率（EOR）技术的效率。为此，对20多个岩芯塞中选出的两个岩石类型相似（就其流动带指数（FZI）值而言）的岩芯塞进行了压汞毛细管压力（MICP）测试，以检验表面活性剂-纳米颗粒EOR方法在二次岩芯驱油实验后减少残留油量的有效性。因此，进行了界面张力（IFT）和接触角测量，以确定岩芯驱油实验中阴离子表面活性剂和二氧化硅纳米颗粒（NPs）的最佳浓度。相对渗透率测试结果表明，PSD会显著影响相对渗透率曲线的端点，通过注入α-烯烃磺酸盐（AOS）表面活性剂+二氧化硅NPs的混合物作为EOR溶液，可以采出大量未被波及的油。岩芯驱油测试结果表明，对于具有均匀和非均匀PSD的碳酸盐岩芯塞，以三次采油模式注入AOS+NPs溶液可使水驱后采收率分别提高2.5%和8.6%。

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