Citation: | TANG Renxuan, LIANG Po, WU Gongyi, CHEN Ju, LIANG Cui. Analyzing and Understanding the Influencing Factors of CO2 Flooding in the Subei Complex Fault Block Reservoirs[J]. Petroleum Drilling Techniques, 2020, 48(1): 98-103. DOI: 10.11911/syztjs.2019125 |
The performance of CO2 flooding in the complex fault block reservoirs of the Subei Basin varies greatly. In order to find effective measures to improve the development of these unique fault-block reservoirs, the main influencing factors were analyzed. Based on the data from 9 CO2 flooding blocks in north Jiangsu, the influences of well type, fracturing conditions, initial production before gas injection, the injection-production ratio and the gas injection method on CO2 flooding effects were analyzed. The analysis results show that the development effect of vertical wells is better than that of horizontal wells, and it is better for non-fractured wells than fractured. The higher the initial production of the well, the better the CO2 flooding effect. The optimal injection-production ratio is around 2.5, while CO2 injection methods play an insignificant role in the development effect. The results show that those factors, such as low permeability reservoir well type and the necessity of reservoir stimulation, are the main factors influencing CO2 flooding. Those issues need to be fully considered in improving the CO2 flooding effect in the complex fault block reservoirs in the Subei Basin.
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