Table 5 Test results of core permeability damage rate.

From: Reservoir damage mechanism and “Double protection” drilling fluid of tight sandstone gas reservoir in central SiChuan Basin

Core number

Pollution system

Permeability before pollution/mD

Permeability after pollution/mD

Permeability damage rate/%

Dynamic filtration loss/mL

1–1

The original system (ρ = 1.7 g/cm3)

0.4205

0.0472

88.77

0

2–2

“Double protection”optimization system (ρ = 1.7 g/cm3)

0.3087

0.2511

18.66

0

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