低渗透油藏注气提高采收率评价

伴随油气田勘探工作的深入，原油中难采低渗透量发现所占比例越来越大。由于渗透率低，一方面注水和其它提高采收率方法使用受到限制，另一方面气源大量发现，给注气源大量发现，给注气提高采收率提供了可能，并显示出突出的优势。通过分析低渗透油藏的特点、国内外低渗透油藏注气实例，针对我国实际情况，提出了一套评价低渗透油藏注气可行性的技术路线和内容，以及注气中应当注重的问题和建议，对低渗透油藏开发可行性评价有很好的指导意义。

Evaluation on IOR by Gas Injection in Low Permeability Oil Reservoir

The 21st century is the natural gas century with the increase of natural gas reserve and production on a large scale. On the other hand, the proportion of the reserve hard to develop due to low permeability increases as the oil and gas exploration and development furthers in depth. It is estimated that there are around 1.8-billion-ton oil left in underground due to low permeability within CNPC. Because of low permeability, water flooding and normal EOR methods are greatly limited. Fortunately, a large number of gas resources has been found, which provide gas enough to carry out gas-injection to enhance oil recovery. In this paper, the characteristics of low permeability reservoir and the present situation of gas-injection to enhance oil recovery in the low permeability reservoir in our country and abroad are analyzed in detail. Then, the points and suggestions when conducting gas-injection are presented, which have significant guidance in developing low permeability reservoirs in our country.