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

Table 1

Some properties of unconsolidated sandstone core samples used in this study.

Group	Sample	Well	Permeability (mD)	Porosity (%)	Length (cm)	Diameter (cm)
Group I, series	1-2-7	Tai4-31	1.93	29.4	5.495	2.355
	1-2-8	Tai4-31	2.11	29.4	5.645	2.386
Group II, series	5-3-2	Tai4-31	9.34	29.5	4.398	3.693
	6-5-1	Tai4-31	10.2	27.0	5.625	3.707
Group III, series	1-3-5	Tai4-31	5.37	33.6	5.346	2.394
	1-4-1	Tai4-31	5.71	32.2	5.394	2.306
Group IV, series	1-5-3	Tai4-31	24.4	36.7	4.535	2.419
	2-2-3	Tai4-31	22.1	37.2	4.438	2.480