关键词: 物质平衡法, 非均质, 油气藏, 数学模型, 开采方式

Abstract: A new model is given for the production behavior of a closed gas reservoir.It considers the gas exchange between high and low production regions, caused by the pressure difference.It is an improvement of the traditional material balance method.With this new model, the production behavior of the central gas field under different well patterns and development index and the behavior of the exchange rate between regions were studied.This made it clear that the gas exchange, caused by regional pressure differences, is a very important factor for the performance of a gas reservoir.For a low permeability gas reservoir with a fixed steady production period and total output, its unbalance degree of development should be increaced to improve its economic efficiency.This means more wells should be drilled in the high production region so that part of gas in the low permeability region can be produced by the wells in the high production region.

Key words: material balance, heterogeneous, reservoir, mathematical model, production manner