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Effect of Reservoir Heterogeneity on $CO_{2}$ Flooding in Tight Oil Reservoirs
| Content Provider | MDPI |
|---|---|
| Author | Luo, Jiashun Hou, Zhengmeng Feng, Guoqing Liao, Jianxing Haris, Muhammad Xiong, Ying |
| Copyright Year | 2022 |
| Description | Carbon dioxide $(CO_{2}$)-enhanced oil recovery (EOR) has great potential and opportunity for further development, and it is one of the vital carbon capture, utilization, and storage (CCUS) technologies. However, strong heterogeneity is one of the several challenges in developing reservoirs, especially for China’s continental tight oil reserves. This study investigates the effects of heterogeneous porosity and permeability on $CO_{2}$ flooding evolution in low-permeable tight formation. We simulated $CO_{2}$-EOR using a numerical model developed on the platform of TOUGH2MP-TMVOC to evaluate the effect of different levels of heterogeneity on oil production, gas storage, and flow behaviors in a tight reservoir, controlled by standard deviation and correlation length. A comparison of nine cases reveals that porosity heterogeneity commonly intensifies flow channeling, and there is an oil production decline with higher standard deviation and longer correlation length of porosity field. In addition, the porosity correlation length has a negligible effect on reservoir performance when the standard deviation is relatively low. Furthermore, strong heterogeneity also has a negative impact on the storage capacity of $CO_{2}$ and oil production. Notably, as the standard deviation was raised to 0.1, a small sweep region arose with the early $CO_{2}$ breakthrough, which led to a worse flooding effect. Finally, this study exemplifies that a higher injection/production rate and $CO_{2}$ alternating $N_{2}$ injection strategies can improve oil recovery in highly heterogeneous reservoirs. |
| Starting Page | 3015 |
| e-ISSN | 19961073 |
| DOI | 10.3390/en15093015 |
| Journal | Energies |
| Issue Number | 9 |
| Volume Number | 15 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-04-20 |
| Access Restriction | Open |
| Subject Keyword | Energies Petroleum Engineering Ccus Enhanced Oil Recovery Co2 Flood Tight Oil Reservoir Porosity Heterogeneity Flow Channeling |
| Content Type | Text |
| Resource Type | Article |
