煤层气井流入动态预测与分析

Prediction and Analysis of Inflow Performance in Coalbed Methane Well

煤层中的吸附气受到水压力梯度的控制,只要水位保持在气体饱和度之下,煤层气就一直保存在煤储层中,如果盆地和气候的变化导致水位下降,储存在煤中的甲烷气将会减少。在煤层气藏的初始阶段,煤割理中几乎被水填满,为了能够生产,需要连续地排水,从而降低水的压力使得气体能够得到解吸。

The adsorbed gas in coalbed is controlled by water pressure gradient.Coalbed methane will always be stored in coalbed as long as the water level is under gas saturation.As the change of basin and climate leads to a decline in water level,methane stored in coal seams will reduce.In the initial phase of coalbed gas reservoirs,the coal cleat almost filled with water,it is necessary to drain continuously in order to produce,then the pressure of water will decline and the gas will be desorbed out.