Research Article
Damage Mechanism of Oil-Based Drilling Fluid Flow in Seepage Channels for Fractured Tight Sandstone Gas Reservoirs
Table 4
Experimental results of dynamic damage (kerosene displacement).
| | Core | Number | Permeability before damage (10-3 μm2) | Permeability after damage (10-3 μm2) | Fluid loss (mL) | Permeability recovery rate (%) |
| | Natural fractured core | 3 | 2.3988 | 0.6875 | 0.4 | 28.66 | | 4 | 3.0395 | 0.9854 | 0.4 | 32.42 | | Artificial fractured core | 6 | 8.4752 | 4.5238 | 0.9 | 53.38 | | 7 | 10.4584 | 3.6846 | 0.7 | 35.23 |
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