Study on the Water Invasion and Its Effect on the Production from Multilayer Unconsolidated Sandstone Gas Reservoirs

Table 3

Results of the residual gas ratio in core samples of different permeabilities.

Permeability	Residual gas ratio (%)
mD	20 mL/min	80 mL/min	150 mL/min
156.0	29	30	29
57.5	29	30	32
11.7	32	34	34
3.6	35	37	50
Average value	31	33	36