多羟基双季铵盐分子沉积膜驱油实验研究*

Experimental Study on Polyhydroxy Bis-quaternary Ammonium Salt Molecular Deposition Film Oil Displacement

王 瑞 曾美婷 何 龙 黄雪莉 刘耀宇 李 洲

WANG Rui ZENG Meiting HE Long HUANG Xueli LIU Yaoyu LI Zhou

分子沉积膜驱油剂（MD膜驱剂）作为一种新兴纳米材料驱油体系，可有效提高驱油效率。本文选用三羟甲 基氨基甲烷、环氧氯丙烷和三乙胺为原料，合成出分子沉积膜驱油用的单分子双季铵盐体系，测定了MD膜驱剂 的黏度、阳离子度、表面张力及其接触角等，并通过动态驱油试验对驱油效果进行了评价。结果表明，合成的MD 膜驱剂性能稳定，体系黏度均在1.11 mPa·s左右；当浓度为800 mg/L时阳离子度达到71.73%，此时在砂岩表面的 吸附性能最好；MD膜驱剂可使润湿性发生转变，将亲油表面载玻片（98.70°）转变为弱亲油（85.31°），使水湿表面 载玻片（58.1°）亲水性增强（45.58°）。MD膜驱剂能驱替出水驱未能采出的原油，水驱转为分子沉积膜驱后，驱油 效率由42.55%上升到48.29%，而直接进行分子沉积膜驱后，驱油效率高达54.81%，相较于水驱后分子膜接替驱 油，直接进行分子膜驱油能够获得更高的采收率。图3表4参15

As a new nano material oil displacement system，molecular deposition filming flooding agent（MDFFA）can effectively improve oil displacement efficiency. In this paper，trihydroxymethyl aminomethane，epichlorohydrin and triethylamine were selected as raw materials to synthesize a single molecular biquaternium salt system for molecular deposition film oil displacement. The viscosity，cation degree，surface tension and contact angle of MDFFA were measured，and the oil displacement effect was evaluated by dynamic flooding test. The results showed that MDFFA had stable performance，and the viscosity of the system was about 1.11 mPa·s. When the concentration was 800 mg/L，the cation degree reached up to 71.73%，and the adsorption performance on the surface of sandstone was the best. MDFFA could change the wettability of the oil-wet surface slide，the connect angle being of 98.70°，to the weak oil-wet，the connect angle being of 85.31°，and made the water-wet surface slide，the connect angle being of 58.1°，more hydrophilic，the connect angle being 45.58°. MDFFA could displace the crude oil that could not be produced by water flooding. After water flooding was converted to molecular deposition flooding，the displacement efficiency increased from 42.55% to 48.29%，while after molecular deposition flooding directly，the displacement efficiency reached up to 54.81%. Compared with molecular film flooding after water flooding，direct molecular film flooding could enhance higher oil recovery.

10.19346/j.cnki.1000-4092.2021.03.014