界面润湿性调控驱油剂的制备与性能评价

Preparation and Performance Evaluation of Oil-displacing Agent with Interfacial Wettability Control

李 琳 陈 佳 徐效平 刘佳伟 徐忠正 孙 雯 朱芷萱 戴彩丽

LI Lin CHEN Jia XU Xiaoping LIU Jiawei XU Zhongzheng SUN Wen ZHU Zhixuan DAI Caili

为高效剥离吸附在岩石表面的油膜，以油酸、过氧化氢、乙酸、氢氧化钠等为主要原料，经两步反应制备了一种新型界面润湿性调控驱油剂9，10-二羟基硬脂酸钠（SDHS）。通过红外光谱、核磁共振氢谱对产物进行了结构表征，并对其吸附性能、润湿性调控性能、降低界面张力性能以及油膜剥离性能进行了评价。结果表明，SDHS在亲油处理后的云母片表面均匀吸附。SDHS可通过吸附调控亲油岩石表面润湿性至强亲水/水下疏油状态。将亲油处理的玻璃片在0.3% SDHS溶液中浸泡48 h，玻璃片表面的水滴接触角由99.2°降至 27.1°，水下油滴接触角由 18.1°增至 142.3°。SDHS 可将油水界面张力降低至 1 mN/m 以下，0.3% SDHS 溶液降低界面张力能力最强。40℃下，经0.3% SDHS处理48 h，载玻片表面的油膜面积减小53.6%，油膜剥离能力优于传统表面活性剂如十二烷基硫酸钠。SDHS同时降低油水界面张力和调控固液界面润湿性，油膜剥离效果较好，有望进一步提高采收率。

In order to peel off the oil film adsorbed on the rock surface efficiently，a novel oil-displacing agent 9，10-dihydroxyl sodium stearate（SDHS）with the capability of interfacial wettability control was synthesized by a two-step method using oleic acid，hydrogen peroxide，acetic acid and sodium hydroxide. The final product was characterized by Fourier transform infrared spectroscopy（FT-IR）and proton nuclear magnetic resonance（1 H NMR），and their adsorption property，wettability control property，interfacial tension reduction property，and oil film peeling performance were evaluated. The results showed that SDHS was evenly absorbed onto the surface of lipophilic-treated mica sheet. When lipophilic-treated glass sheet was immersed in 0.3% SDHS solution for 48 hours，the water contact angle in air reduced from 99.2° to 27.1°，while the underwater oil contact angle increased from 18.1° to 142.3°，indicating that SDHS could regulate the surface wettability of oil-wet rock to a strong hydrophilic and under water oil-repellent state by adsorption. SDHS could reduce the oil-water interfacial tension below 1 mN/m，and 0.3% SDHS solution exhibited the best performance in reducing the interfacial tension. At 40℃，0.3% SDHS solution could reduce the area of oil film by 53.6% after soaking glass slide within 48 hours，whose oil film peeling performance was better than that of traditional surfactant such as sodium dodecyl sulfate（SDS）. SDHS could simultaneously reduce the oil-water interfacial tension and regulate the wettability of solid-liquid interface，and exhibited excellent oil film peeling performance，which could be applied for further improving the oil recovery.

10.19346/j.cnki.1000-4092.2021.01.017