轻油注空气提高采收率技术

EOR technology of air injection to light oil reservoir

低渗透油藏大多属于轻质油藏,轻质油藏注空气已经越来越受到人们的关注。通过调研国内外大量的文献,论述了轻油注空气技术的机理,分析了轻油注空气与重油层内燃烧的区别,阐述了高压注空气室内评价实验。通过实例分析了轻油注空气技术的经济性,并对我国发展轻油高压注空气技术的前景进行了分析。最后指出轻油注空气特别适用于注水开发效果差的低渗及特低渗等采用常规开采方法开发效果差的油藏。

The study on air injection mainly aims at the heavy oil in China, but most of low permeability reservoirs are light oil reservoirs. Hence, air injection in light oil has got more and more attention. By investigation of a large number of domestic and foreign literatures, this paper discusses the mechanism of light-oil air injection, analyzes the difference of light-oil air injection and situ combustion and describes the laboratory experiment of high pressure air injection. At the same time, it also analyzes the feasibility of economy and predicts the prospect of light oil injection in our country. Finally, it points out that the air injection is especially suitable to the low permeability reservoirs with poor waterflooding effect and the ultra-low permeability reservoirs which can not be recovered by using conventional method.