烷基二磺酸盐/氧化胺表面活性剂协同增强泡沫性能

DDBS/CAO surfactants synergistically enhance foam performance

摘要:

为强化高温高盐油藏苛刻条件下的泡沫性能，研究了十二烷基二苯醚二磺酸钠（DDBS）和椰油酰胺丙基氧化胺（CAO）二元体系的协同作用，测试其临界胶束浓度(CMC)、表面张力和泡沫性能。结果表明，两者在界面吸附单层和胶束中的相互作用参数均处于-3和-7之间，呈中等程度的协同作用，二元体系与单剂相比，显著降低CMC和表面张力，增加饱和吸附量，因此，泡沫性能明显增强。选择最佳摩尔比n(DDBS):n(CAO)=6:4得到泡沫封窜剂SHY-1，耐盐范围宽，在矿化度0-158308 mg/L，钙镁离子0-10000 mg/L均具有良好的泡沫性能。105℃，在多孔介质中原位产生泡沫，表观黏度达到180mPa?s。DDBS/CAO表面活性剂协同增强泡沫性能，为高温高盐油藏泡沫封窜技术应用带来广阔前景。

Abstract:

In order to improve the foam performance under harsh conditions of high-temperature and high-salt oil reservoirs, the synergistic effect of the binary system of dodecyl diphenyl ether disulfonate (DDBS) and cocoamidopropylamine oxide (CAO) was studied. The critical micelle concentration (CMC), surface tension and foam performance were tested. The results showed that the interaction parameters of the two substances in the monolayer adsorption at the interface and micelles were between -3 and -7, showing a moderate degree of synergism. Compared with the single surfactant, the binary system significantly reduced the CMC and surface tension, and increased the saturation adsorption capacity, thus improving the foam performance significantly. When the optimal molar ratio n(DDBS):n(CAO)=6:4 was selected, naming SHY-1, which had a wide salinity adaptation range. It exhibited good foam performance at a salinity of 0-158308 mg/L and calcium and magnesium ions of 0-10000 mg/L. The foam was generated in situ in porous media at 105℃, with a apparent viscosity of 180 mPa?s, effectively sealing the channeling. DDBS/CAO surfactants can enhance the foam properties, which brings broad prospects for the application of foam in high-temperature and high-salt reservoirs.