Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (1): 63-68.DOI: 10.6023/A21080413 Previous Articles     Next Articles



李琳a,b,*(), 王子昭a,b, 刘佳伟a,b, 陈佳a,b, 金晓a,b, 戴彩丽a,b   

  1. a中国石油大学(华东) 石油工程学院 青岛 266580
    b中国石油大学(华东) 非常规油气开发教育部重点实验室 青岛 266580
  • 投稿日期:2021-08-31 发布日期:2021-12-13
  • 通讯作者: 李琳
  • 基金资助:
    国家重点研发计划项目(2019YFA0708700); 国家自然科学基金(52174054); 山东省自然科学基金(ZR2019BEE046)

Synthesis and Performance Evaluation of Polyhydroxy Benzene Sulfonate Oil Displacement Agent Based on Enhanced Interfacial Wettability Control

Lin Lia,b(), Zizhao Wanga,b, Jiawei Liua,b, Jia Chena,b, Xiao Jina,b, Caili Daia,b   

  1. aSchool of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
    bKey Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, China
  • Received:2021-08-31 Published:2021-12-13
  • Contact: Lin Li
  • Supported by:
    National Key R&D Program of China(2019YFA0708700); National Natural Science Foundation of China(52174054); Shandong Provincial Natural Science Foundation(ZR2019BEE046)

Controlling the wettability of the oil-rock interface is an important way for highly efficient oilfield development. For existing anionic surfactants, their capability of changing the wettability of the rock surface is limited. Therefore, developing novel oil displacement agent with enhanced interfacial wettability control capability is of great significance. In this work, an interfacial wettability controlling oil displacement agent, sodium dimethyloldodecyl benzene sulfonate (SDDBS), was synthesized and the structure was characterized by Fourier transform infrared (FT-IR) and 1H-nuclear magnetic resonance (1H NMR). The critical micelle concentration (cmc) of SDDBS was measured by spinning drop method and was determined as 0.02% (w). The adsorption behavior of SDDBS on oil-wet rock surface, the interfacial tension reduction property, wettability controlling property, oil film peeling performance and the oil displacement performance were evaluated. Based on the atomic force microscopy (AFM) images, SDDBS could adsorb uniformly on the surface of oil-wet rocks. The oil/water interfacial tension could be reduced to 2.54 mN/m under cmc. After immersing the oil-wet glass sheet in 0.02% (w) SDDBS solution for 48 h, the contact angle of the glass sheet towards water drop in air reduced from 100.2° to 24.5°, while the contact angle towards oil drop underwater increased from 19.2° to 153.9°, proving that SDDBS could regulate the wettability of the oil-wet/hydrophobic rock surface to strong hydrophilic/underwater oleophobic state. The oil film peeling performance of SDDBS was evaluated by calculating the remaining oil film area by graphical analysis software. When soaked in 0.02% (w) SDDBS solution at 60 ℃, the area of oil film could be reduced by 89% within 24 h. The oil film reduction rate could still reach 81% in simulated formation water, indicating good reservoir adaptability. Laboratory simulation core displacement experiments were conducted at 60 ℃ and the results showed that the oil recovery rate was increased by 10.53%. In this work, a novel polyhydroxy benzene sulfonate surfactant was synthesized by one-step method. By introducing hydrogen bond to enhance the interfacial wetting control ability of surfactant, the oil film could be peeled off efficiently, exhibiting strong practical application potential.

Key words: surfactant, oil displacement agent, interfacial wettability, oil film peeling off