Sutdy on influencing factors of air injection to enhance EOR in light-oil reservoir

By means of physical modeling and numerical simulation,the dynamic oil displacement tests of air injection and natural gas injection in light-oil reservoir was conducted for WX reservoir.The influences of reservoir temperature,pressure,pressure differential and other factors on development effect have been studied in this paper.Meanwhile,the gas miscible or immiscible injection character and recovery with air drive has also been researched.Compared with those of natural gas drive,the experimental results showed that high temperature and high pressure condition could accelerate the oil oxidation reaction,which led to a better displacement effect,and the similar phenomenon could be observed by reducing pressure differential.Both air injection and natural gas injection under WX reservoir pressure had been characterized as immiscible displacement.The displacement ability of air injection was enhanced by low temperature oxidation(LTO) reaction and extraction effect on light oil component,so its recovery was close to that of natural gas injection.Considering the cost,economic benefits and other factors comprehensively,the air injection technique is more suitable to the development of WX reservoir.