Abstract:

The foam stability is very important in the successive operation of foam fluids in drilling, and the drainage is the macroscopical representation of foam stability. The drainage behavior and liquid films of foam were studied by using the mesoscale molecule simulation. According to the structures of foam solution, the linkage of interfacial aggregation of surfactant molecules with the foaming ability was determined. The factors, including the force field, thickness of liquid film, density of surfactant molecule and the surfactant types, greatly affected the interface energy-formation, and the drainage behavior followed the decay equation regardless of the surfactant types. The molecule simulation could correctly express the foaming ability of different surfactants, especially in low surfactant concentration.

Key words: mesoscale molecule simulation, foam fluid, drainage behavior, surfactant agent, foaming ability

摘要：

泡沫稳定性是泡沫流体作业成功的关键,而析液是泡沫稳定性的宏观表现。利用介观分子模拟方法,研究了泡沫液膜及其微观析液行为,并依据泡沫剂结构,建立了表面活性剂界面聚集行为与泡沫剂发泡能力之间的关系。研究发现,力场、液膜厚度、表面活性剂分子密度以及表面活性剂类型等因素都对其界面生成能产生较大影响。不同表面活性剂产生的泡沫体系的析液行为遵循衰减方程。同时,分子模拟方法可以准确地反映表面活性剂的发泡能力,尤其是在低浓度条件下生成泡沫的能力。

关键词: 介观分子模拟, 泡沫流体, 析液行为, 表面活性剂, 发泡能力