Research Article
Development and Research Status of Heavy Oil Enhanced Oil Recovery
Table 2
Production characteristics and reservoir adaptability of different heavy oil cold recovery techniques.
| | Reservoir properties | Polymer flooding development | Chemical viscosity reduction development | Microbial enhanced oil recovery |
| | Reservoir depth (m) | 65–1400 | <1400 | <2500 | | Oil viscosity (MPa·s) | <60 | 50–100 | <40 | | Effective thickness of oil layer (m) | — | — | >15 | | Permeability (10−3 μm2) | >50 | >50 | >50 | | Permeability coefficient of variation | 0.6–0.75 | <0.70 | 0.64–0.75 | | Advantages | Low temperature, fresh water, heterogeneity | Low clay content, low water hardness | Low temperature, high acidity, heterogeneity | | Disadvantages | Bottom water, high gray matter content | Cracks, bottom water, heterogeneity | Air cap, bottom water, heterogeneity |
|
|
