Reducing Residual Oil Saturation: Underlying Mechanism of Imbibition in Oil Recovery Enhancement of Tight Reservoir
| Autor: | Mingxian Wang, Yang Shi, Yun Jiang, Guoqing Xu, XingHang Zeng, Yujiao Han |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
020401 chemical engineering Petroleum engineering 020209 energy Residual oil saturation 0202 electrical engineering electronic engineering information engineering Energy Engineering and Power Technology Imbibition 02 engineering and technology 0204 chemical engineering Geotechnical Engineering and Engineering Geology Mechanism (sociology) |
| Zdroj: | SPE Journal. 26:2340-2351 |
| ISSN: | 1930-0220 1086-055X |
| DOI: | 10.2118/205491-pa |
| Popis: | SummarySpontaneous imbibition (SI) is regarded as an effective method to improve the oil recovery in a tight sandstone reservoir, which leads to a significant change in fracturing design and flowback treatment. However, a longtime shut-in period would aggravate the retention of fracturing fluid, which is in contradiction with high production in the field. It is imperative to understand how SI works during shut-in time, so as to maximize the effect of imbibition in oil recovery enhancement. In this study, a series of experiments were conducted to simulate the status of residual oil saturation so that the inner mechanism of imbibition on oil recovery can be investigated. Low-field nuclear magnetic resonance (LF-NMR) was used to provide direct observation of phase changes in different pore sizes. The experimental results show a positive effect of imbibition on residual oil reduction. This phenomenon further elucidates the observations made during the well shut-in, soaking period, and low flowback efficiency. This study aims to understand the mechanism of SI behavior and help to improve the accuracy of production prediction. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|