Research Article
Experimental Study on the Oil Recovery Performance of CO2 Huff-and-Puff Process in Fractured Tight Oil Reservoirs
Table 6
The oil recovery factor of different pores after huff-and-puff tests with different depressurization method.
| | Pore types | Fractured core #2 | Matrix core #5 | | Rapid (%) | Slow (%) | Step (%) | Rapid (%) | Slow (%) | Step (%) |
| | Micro pores (≤5 ms) | 11.93 | 20.50 | 13.02 | 2.13 | 4.76 | 9.83 | | Medium pores (5∼100 ms) | 45.78 | 55.75 | 51.35 | 15.80 | 17.98 | 28.94 | | Large pores (≥100 ms) | 60.36 | 48.07 | 53.07 | 38.40 | 48.81 | 55.22 | | Total | 36.16 | 39.37 | 37.29 | 18.67 | 19.17 | 23.85 |
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