渗透率及含油饱和度对泡沫性能的影响研究

Influence of Permeability and Oil Saturation on the Foaming Ability

针对油层渗透率和含油饱和度的不同使同种泡沫体系的起泡能力和封堵能力有较大差异,开展了不同渗透率和含油饱和度条件下泡沫体系的起泡能力和封堵能力研究。研究依靠室内驱替实验测定压力表读数,计算不同渗透率和含油饱和度条件下的阻力系数。结果表明:随着渗透率的增加泡沫起泡能力增加、封堵能力变好,当渗透率大于463 mD后,渗透率对起泡能力和封堵能力的影响变小;同时随着运移位置的增加阻力系数降低,泡沫体系起泡能力小于消泡能力,封堵能力变差;而随着含油饱和度的增加泡沫起泡能力和封堵能力逐渐降低,但在不同含油饱和度条件下降低幅度不同,可以分为3个阶段:缓慢下降、急剧下降和平衡阶段,在含油饱和度低于33%情况下,阻力系数高于23,此时起泡能力强、封堵性能好。为下阶段研究泡沫驱在油田的开展奠定了理论基础。

The difference of reservoir permeability and oil saturation makes foaming ability and sealing ability of the same foam system different.We studied the foaming and sealing ability under the condition of different permeability and oil saturation.With indoor displacement experiment to measure the piezometer reading,we calculated resistance coefficient of different permeability and oil saturation.Results show that foamability and sealing ability increase with the increase of permeability,when the permeability is more than 463 mD,permeability cannot affect the foaming ability and sealing ability.On the other hand,the resistance coefficient and sealing ability decrease with the increase of the distance,and foaming ability is less than the defoaming ability.Foaming ability and sealing ability gradually reduce with the increase of oil saturation,which can be divided into three stages under different oil saturation：slow decline stage,sharp decline stage,and balance stage.Resistance coefficient is more than 23 when oil saturation is lower than 33%,and the foaming and sealing ability is good.This research has laid a theoretical basis for the foam flooding in oilfield development.