抄録
There are two types of production performance in the Southern-Kanto Gas Field, natural gas deposit of dissolved-in-water type. One is called “common type” which gas water ratio is almost constant during its whole producing period. The other is called “Mobara type” which gas water ratio increases rapidly and reservoir pressure is greatly depleted during its early producing period.
In this study, sensitivities of reservoir parameters such as depth, drainage area, original gas in place, et al. affecting gas production performance are analysed numerically and actual production performance of “common type” and “Mobara type”-well is simulated.
These studies suggest that existence of free gas initially in the reservoir and strength of water influx into producing wells cause mainly difference of production performance between “common type” and “Mobara type”.
