Research Article
Development and Research Status of Heavy Oil Enhanced Oil Recovery
Table 1
Production characteristics and reservoir adaptability of the different heavy oil thermal recovery techniques.
| | Reservoir properties | Steam huff and puff | Steam flooding | Steam-assisted gravity drainage | In situ combustion | Thermochemical combined flooding | Multielement thermal fluid technique |
| | Reservoir depth (m) | 65–1400 | <1400 | <1400 | 150–1400 | <2500 | <2500 | | Oil viscosity (MPa·s) | >60 | 50–100 | 50–100 | >20 | <60 | <60 | | Effective thickness of oil layer (m) | >6 | >10 | >15 | 3–15 | — | — | | Permeability (10−3 μm2) | >100 | >200 | >150 | >100 | >50 | >50 | | Permeability coefficient of variation | <0.6 | — | <0.6 | — | 0.64–0.75 | 0.6–0.75 | | Advantages | Shallow well, heavy oil | Severe heterogeneity | Thick oil layer | Low vertical permeability of inclined oil layer | Fresh water, high acidity, heterogeneity | Low temperature, fresh water, high acidity, heterogeneity | | Disadvantages | Cracks, heterogeneity | Cracks | Cracks, barriers | Cracks, gas caps, low porosity | Air cap, bottom water | Air cap, bottom water |
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