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

doi:10.6023/A21080413

Abstract

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

Cite this article

Lin Li, Zizhao Wang, Jiawei Liu, Jia Chen, Xiao Jin, Caili Dai. Synthesis and Performance Evaluation of Polyhydroxy Benzene Sulfonate Oil Displacement Agent Based on Enhanced Interfacial Wettability Control[J]. Acta Chimica Sinica, 2022, 80(1): 63-68.

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Fig. & Tab. 10

Figure 1. Synthesis schematic diagram of SDDBS

Figure 2. (a) FT-IR and (b) 1H NMR of SDDBS

Figure 3. Change of surface tension with mass concentration of SDDBS at room temperature

Figure 4. (a) 3D figure of AFM surface morphology of oil-wet mica after adsorption in 0.02% (w) SDDBS solution; (b) 2D figure of AFM surface morphology; (c) adsorption thickness diagram of selected path

Figure 5. Change of n-hexane/water interfacial tension with mass concentration of SDBS and SDDBS at 60 ℃

Figure 6. Contact angles of water droplets in air (a) and oil droplets underwater (b) after the oil-wet glass sheets were soaked in SDBS, SDDBS solution with deionized water and SDDBS solution with formation water for 48 h

Figure 7. (a) Oil film stripping state in SDDBS and SDBS; (b) curves of relative area of oil film over time under different conditions

Figure 8. Schematic diagram of oil film stripping by SDDBS

长度/ cm	直径/ cm	渗透率/ (10^-3 µm²)	孔隙体积/ cm³		孔隙度/%	含油饱和度/%
7.482	2.526	57.0		6.05	16.21	76.00

Table 1. Core parameters used in the experiment

Figure 9. SDDBS displacement performance test results

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