Aquifers in gas reservoirs can affect gas well production. Water can enter the reservoir when pressure drops, changing production. Three methods were used to study aquifer influx: Blasingame, FMB, and MBE. By analyzing gas well production data, researchers identified three influx periods: no-aquifer, early-aquifer, and middle-late-aquifer. The methods accurately determined aquifer influx and rate, helping in gas field development with aquifer support.