Effect of Oil-Displacing Agent Composition on Oil/Water InterfaceStability of the Asphaltene-Rich ASP Flooding-Produced Water
Effect of Oil-Displacing Agent Composition on Oil/Water InterfaceStability of the Asphaltene-Rich ASP Flooding-Produced Water
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DOI：
10.1021/acs.langmuir.1c02466
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发表时间：
2022-03-09
期刊：
影响因子：
3.9
通讯作者：
Li, Xiaobing
中科院分区：
文献类型：
--
作者：
Li, Xiaoqing;Liu, Dandan;Li, Xiaobing
本工作系统研究了驱油剂组成对富含沥青质的碱表面活性剂聚合物（ASP）驱采出水油水界面稳定性的影响，特别是从驱油剂与沥青质在油水界面的相互作用角度进行了研究。首先，通过分子动力学模拟研究了人工和天然界面物质（驱油表面活性剂和沥青质）在油/水界面上的吸附行为。驱油表面活性剂与沥青质形成交联致密的界面膜结构，显着增强界面稳定性；界面上吸附的驱油表面活性剂越多，其与沥青质之间形成的交联结构越稳定。然后，通过界面张力、zeta 电位和界面膜流变学测试来监测由驱油剂和沥青质之间的相互作用差异引起的界面性质变化。此外，还进一步研究了驱油剂浓度对界面膜减薄和破裂动力学行为的影响。最后通过奶油实验验证驱油剂组合物对富含沥青质的三元复合驱采出水油水分离效率的影响。当添加5%沥青质时，19 h时乳化油去除率从90.0%降低至85.3%。沥青质和驱油剂之间的相互作用极大地增强了油/水界面膜的强度并阻碍了油/水分离过程
In this work, the effect of oil-displacing agent composition on oil/water interface stability of the asphaltene-rich alkali-surfactant-polymer (ASP)flooding-produced water was systematically investigated, especially from theperspective of the interaction between oil displacement agents and asphaltene atthe oil/water interface. Primarily, adsorption behavior of the artificial and naturalinterfacial substances (oil displacement surfactant and asphaltenes) on the oil/water interface was investigated by molecular dynamics simulation. The oildisplacement surfactant and asphaltenes formed a cross-linked and compactinterfacialfilm structure, which significantly enhanced the interface stability; themore the oil displacement surfactants adsorbed on the interface, the more stable isthe cross-linked structure formed between them and asphaltenes. Then, theinterfacial property variations that are originating from the interactions differencesbetween oil displacement agents and asphaltenes were monitored via interfacialtension, zeta potential, and interfacialfilm rheology tests. Moreover, the effect ofoil displacement agent concentrations on the interfacialfilm thinning and rupture kinetic behavior was further investigated. Finally,cream experiments were conducted to verify the effect of oil displacement agent composition on the oil/water separation efficienciesof asphaltene-rich ASPflooding-produced water. When 5% asphaltenes was added, the creaming oil removal rate reduced from 90.0to 85.3% at 19 h. The interactions between asphaltenes and oil displacement agents immensely enhance the oil/water interfacialfilmstrength and impede the oil/water separation process