Geofluids / 2019 / Article / Tab 4

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).

CoreNumberPermeability before damage (10-3 μm2)Permeability after damage (10-3 μm2)Fluid loss (mL)Permeability recovery rate (%)

Natural fractured core32.39880.68750.428.66
43.03950.98540.432.42
Artificial fractured core68.47524.52380.953.38
710.45843.68460.735.23

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