裂缝性油藏注气提高采收率技术进展

注气可以维持裂缝性储层的地层压力，并提高驱油效率。阐述了世界裂缝性油藏注气提高原油采收率（EOR）技术的发展概况，分析和讨论了裂缝性储层注气开采特征、室内实验研究及理论研究技术现状。指出，储层中裂缝发育方向和程度严重影响注气驱替效果；气驱突破速度未必比水驱突破快；气驱波及范围有可能比水驱波及范围广。多孔介质将影响流体相态、油气混相性及气驱油机理，建议加强考虑双重介质特性的注气驱相关室内实验研究和混相理论研究。

DEVELOPMENT OF EOR BY GAS INJECTION IN FRACTURED RESERVOIRS

Gas injection into fractured reservoirs can maintain the formation pressure and improve the displacement efficiency. This paper reviewed the development of EOR by gas injection in fractured reservoirs of the world, and analyzed the general production characteristics during gas injection in fractured reservoirs. It also showed the present laboratory techniques and mathematical simulation techniques in this field, and discussed their limitations. Conclusions were made that the fracture distribution severely affected the gas displacement performance, and that gas breakthrough may not be faster than water breakthrough, and that the sweep efficiency in a gas injection process may be larger than that in water flooding. For the porous media will affect the phase behavior and miscibility and mechanisms during gas displacement, the suggestion were made that further experimental and theoretical researches should be done on gas injection in fractured reservoirs regarding the effects of porous media.