茂原型水溶性ガス田の産出挙動シミュレーション

放射流モデル

抄録

A mathematical model is developed for predicting reservoir behavior in the Mobara type water-dissolved natural gas field. The model consists of the mathematical description of the flow of water and gas in the reservoir which is composed of the alternation of sandstone and mudstone. This description considers gas exudation at the face of the mudstone and horizontal radial flow in the sandstone.
An application of the model to the practical reservoir problem (in the Sencho district) has revealed that the calculated values of gas water ratio and bottom hole pressure are in general agreement with the measured ones and that gas exudation at the face of the mudstone is a principal cause of the peculiar performance such that the gas water ratio rapidly increases with production in the field.