当代化工

在提高采收率技术中，泡沫驱因其堵大不堵小、堵水不堵油的特性，兼具气驱、表面活性剂驱的特点，成为了一种极具发展潜力的技术手段，但泡沫驱目前仍面临着泡沫耐盐性与耐温性不足、稳泡剂价格较贵等问题。过复配起泡剂与无机颗粒类稳泡剂，配制出耐盐271 301.78 mg·L^-1、耐温90℃的泡沫体系，通过起泡实验考察高盐环境、矿化度、温度与稳泡剂浓度对体系泡沫性能的影响。通过驱替实验研究体系泡沫调剖以及驱油性能。实验结果表明：室内配制体系为0.5%(质量分数)TGG+1.0%(质量分数)稳泡剂LAO-30+1.5%(质量分数)钠基膨润土，该体系在矿化度271 301.78 mg·L^-1、温度90℃的环境下，泡沫的析液半衰期均超过1 200 s。泡沫体系随着矿化度的升高、温度的降低、稳泡剂浓度的升高，起泡能力逐渐减弱，泡沫稳定性逐渐增强。驱替实验表明：泡沫体系在适宜渗透率的岩心中具有良好的调剖和驱油性能。

In the enhanced oil recovery technologies,foam flooding has become a technical method with great development potential because of its characteristics of blocking big pores but not small pores,blocking water but not oil,as well as the characteristics of gas flooding and surfactant flooding.However,foam flooding still faces problems such as insufficient salt and temperature tolerance of foam,and relatively expensive foam stabilizer.In this paper,a foam system with a salt tolerance of 271 301.78 mg·L^-1 and a temperature resistance of 90℃was prepared by compounding a foaming agent and an inorganic particle foam stabilizer.The effect of high-salt environment,salinity,temperature and foam stabilizer concentration on the foam performance of the system was investigated.The foam profile control and oil displacement performance of the system were studied through displacement experiments.The experimental results showed that the indoor preparation system was determined as follows:0.5%(mass fraction) TGG+1.0%(mass fraction) foam stabilizer LAO-30+1.5%(mass fraction) sodium bentonite.Under all conditions,the liquid separation half-life of the foam was more than 1 200 s.With the increase of salinity,the decrease of temperature and the increase of the concentration of foam stabilizer,the foaming ability of the foam system was gradually weakened,and the foam stability was gradually enhanced.Displacement experiments showed that the foam system had good profile control and oil displacement performance in rock cores with suitable permeability.