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聚合物驱油过程中接枝到SiO纳米颗粒上的油酸钠表面活性剂浓度的影响。

Effect of Sodium Oleate Surfactant Concentration Grafted onto SiO Nanoparticles in Polymer Flooding Processes.

作者信息

Llanos Sebastián, Giraldo Lady J, Santamaria Oveimar, Franco Camilo A, Cortés Farid B

机构信息

Grupo de Investigación Fenómenos de Superficie-Michael Polanyi, Facultad de Minas and Grupo de Investigación en Yacimientos de Hidrocarburos, Facultad de Minas, Universidad Nacional de Colombia Sede Medellín, Kra 80 No. 65-223, Medellín 050041, Colombia.

出版信息

ACS Omega. 2018 Dec 28;3(12):18673-18684. doi: 10.1021/acsomega.8b02944. eCollection 2018 Dec 31.

DOI:10.1021/acsomega.8b02944
PMID:31458433
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6643411/
Abstract

The nanotechnology has been applied recently to increase the efficiency of enhanced oil recovery methods. The main objective of this study is to evaluate the effect of SiO nanoparticle functionalization with different loadings of sodium oleate surfactant for polymer flooding processes. The sodium oleate surfactant was synthesized using oleic acid and NaCl. The SiO nanoparticles were functionalized by physical adsorption using different surfactant loadings of 2.45, 4.08, and 8.31 wt % and were characterized by thermogravimetric analyses, Fourier-transform infrared spectroscopy, dynamic light scattering, and zeta potential. Adsorption and desorption experiments of partially hydrolyzed polyacrylamide (HPAM) polymer solutions over the unmodified and surface-modified nanoparticles were performed, with higher adsorption capacity as the surfactant loading increases. The adsorption isotherms have a type III behavior, and polymer desorption from the nanoparticle surface was considered null. The effect of nanoparticles in the polymer solutions was evaluated through rheological measurements, interfacial tension (IFT) tests, contact angle measurements, capillary number, and displacement tests in a micromodel. The surface-modified SiO nanoparticles showed a slight effect on the viscosity of the polymer solution and high influence on the IFT reduction and wettability alteration of the porous medium leading to an increase of the capillary number. Displacement tests showed that the oil recovery could increase up to 23 and 77% regarding polymer flooding and water flooding, respectively, by including the surface-functionalized materials.

摘要

纳米技术最近已被应用于提高强化采油方法的效率。本研究的主要目的是评估用不同负载量油酸钠表面活性剂对SiO纳米颗粒进行功能化处理对聚合物驱油过程的影响。油酸钠表面活性剂是使用油酸和氯化钠合成的。通过物理吸附，使用2.45、4.08和8.31 wt%的不同表面活性剂负载量对SiO纳米颗粒进行功能化处理，并通过热重分析、傅里叶变换红外光谱、动态光散射和zeta电位进行表征。进行了部分水解聚丙烯酰胺（HPAM）聚合物溶液在未改性和表面改性纳米颗粒上的吸附和解吸实验，随着表面活性剂负载量的增加，吸附容量更高。吸附等温线具有III型行为，并且认为聚合物从纳米颗粒表面的解吸为零。通过流变学测量、界面张力（IFT）测试、接触角测量、毛细管数和微模型中的驱替测试，评估了纳米颗粒在聚合物溶液中的作用。表面改性的SiO纳米颗粒对聚合物溶液的粘度影响较小，但对IFT降低和多孔介质润湿性改变有很大影响，导致毛细管数增加。驱替测试表明，通过加入表面功能化材料，与聚合物驱和水驱相比，采收率分别可提高23%和77%。

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