低渗透油藏注气提高采收率前景分析

低渗透油藏的储量是难采储量的主要部分，如何提高低渗透油藏采收率已成为当务之急。文章分析了低渗透油藏的特点，介绍了国内外低渗透油藏注气提高采收率情况及实例，分析了低渗透油藏注气方式，认为先注气效果好于先注水，段塞的长度、注入体积、注入压力、注入速度等要根据具体情况来确实，文章还对我国低渗透油藏注气提出了若干建议，这为低渗透油藏注气项目的开展提供了参考依据。

AN ANALYSIS OF PROSPECT OF EOR BY GAS INJECTION IN LOW-PERMEABILITY OIL RESERVOIR

Reserves of low-permeability oil reservoirs are the main part of hard-to-recover reserves and how to enhance oil recovery factor of this kind of reservoirs has become the most pressing matter of the moment. It is analyzed that the characteristics of low-permeability oil reservoirs, introduces the status and several cases of EOR by gas injection both at home and abroad, and studies gas injection methods in low-permeability reservoirs. It is believed that the effects of injecting gas first are better than injecting water first, and the length of slug, total volume, injection pressure and input speed should be determined according to specific situations. Several proposals are also presented for gas injection in domestic low-permeability oil reservoirs, which provide a basis for implementing gas injection projects in this kind of reservoirs.