摘要
稠油中含有大量的胶质、沥青质,而胶质、沥青质的极性和表面活性很强,当它们与岩石颗粒表面接触时,就表现出明显的相互作用。这样,在岩石颗粒表面就形成一个富含极性物质的特殊液体层——边界层。稠油边界层的存在影响到稠油在地层中的流动,最终影响到水驱采收率。通过室内试验研究了稠油在多孔介质中的渗流规律,并以此为基础研究了注采压差与采收率的关系。结果表明,稠油在多孔介质中流动存在一启动压力,渗透率越低,启动压力越大,注水开发时注入压力必须高于启动压力,在考虑防止指进的情况下适当提高注水压力,降低边界层的厚度,才能提高稠油的采收率。
There were plenty of gums and asphaltene containing heavy oil,whose polarity and surface activity were strong,when they were in contact with rock particle surface,it presented obvious interaction and formed a special liquid layer(boundary layer)containing rich polar substances in the rock particle surface.Viscous boundary layer existed in the formation would affect the flow of heavy oil,it ultimately affected water displacement recovery.The percolation law of heavy oil in porous media was studied in a laboratory experiment,and it was used as a basis for studying the relationship between injection-production pressure and oil recovery.The result shows that heavy oil flow in the porous media exists a starting pressure,the lower the permeability is,the higher starting pressure is,thus the injection pressure must be higher than that of starting pressure and the injection pressure should be maximized to reduce the boundary layer thickness to enhance oil recovery in the case of preventing fingering.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2010年第5期115-117,共3页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2008ZX05024-004)
关键词
稠油
非线性渗流
采收率
边界层
启动压力
heavy oil
nonlinear flow
recovery
boundary layer
starting pressure
