耐温抗盐改性甜菜碱表面活性剂MBS16 的合成及室内性能评价

Synthesis and Properties of Modified Betaine Surfactant MBS16

郭淑凤

GUO Shufeng

为提高磺基甜菜碱表面活性剂在胜利油田高温高盐油藏的水溶性，在磺基甜菜碱分子中引入了羟基，采用“两步法”合成了具有高界面活性的驱油用表面活性剂—十六烷基羟基磺基甜菜碱（MBS16），通过红外光谱、核磁共振光谱对该表面活性剂的结构进行了表征，利用界面张力仪和Ross-Miles 泡沫仪研究了其油水界面活性和泡沫性能，并在气测渗透率约为1500×10-3 μm2的填砂管中进行了驱油实验。结果表明，合成的产物与所设计的目标分子结构相吻合，在胜利油田孤岛、孤东、胜坨的油水条件下，0.3% MBS16 溶液与原油间均能达到超低的界面张力，具有良好的耐温抗盐性；在0.15%聚合物（HPAM）溶液中加入0.3% MBS16 后体系的黏度略有增加；同等注入段塞（0.3 PV）条件下，在水驱采收率48.6%的基础上，0.3% MBS16+0.15% HPAM二元体系提高采收率（16.5%）较单一聚合物体系（0.15% HPAM）提高采收率（7.1%）增加9.4%。此外，MBS16 还具有很强的发泡能力，与阴-非表面活性剂B4的复配体系具有很好的稳泡性能。图4 表4 参10

In order to improve the solubility of Betaine surfactant in the high-temperature and high-salinity reservoir conditions of Shengli oilfield，the hydroxyl groups were introduced onto the molecular chains of sulfobetaine surfactant，a novel alkyl-hydroxyl-sulfobetaine surfactant MBS16 was synthesized by two-step method. The structure of the surfactant MBS16 was characterized by infrared spectrum （IR） and nuclear magnetic resonance （NMR）. The oil/water interfacial activity and foam properties were investigated using spinning-drop interfacial tensiometer and Ross-Miles meter；and the oil displacement experiment was conducted in a sandpacked core with the permeability of 1500 ×10-3 μm2. The results showed that interfacial tension（IFT） between 0.3% modified betaine surfactant solutions and Shengli crude oil from various blocks could reach ultralow，implying that the surfactant was temperature-resistant and salt-tolerant. Compared with single HPAM system（0.15% HPAM），the viscosity of the compound system（0.3% MBS16 + 0.15% HPAM）increased slightly. The oil displacement experiment results indicated that the compound system（surfactant/polymer）increased oil recovery by 9.4% than single HPAM system did. Moreover，the foaming ability of the modified betaine was strong and the foam stability of the modified betaine compounded with anionic-nonionic surfactant B4 was good.

10.19346/j.cnki.1000-4092.2016.03.020