三交地区煤层气井产量的拟合分析

以河东煤田三交区块煤层气井生产资料为基础,利用煤层气地质学和地下水动力学原理对煤层气井的生产曲线进行了拟合分析,并最终确定了两口煤层气井的水文地质参数。利用Ja-cob公式获得了既定水文地质条件下的产气量及产水量的理论曲线。对比分析结果表明,生产曲线和理论曲线拟合较好,用理论模型进行煤层气井的产能预报是可行的;理论产水量及产气量偏低的原因是由于煤层气开采过程中压裂的影响,开采初期压裂增强了煤层的渗流能力,使得实际值大于理论值。

Curve Fitting Analysis on the Production Capacity of Coalbed Gas Wells in Sanjiao Region of Hedong Coal Field

Taken production data of coalbed gas wells in Sanjiao region of Hedong coal field as base and utilized the principles of coalbed methane geology and groundwater dynamics,fitting analysis is made on production curve of coalbed gas wells.Based upon these hydro-geological parameters of two coalbed gas wells are obtained.By utilizing Jacob formula theoretical curves of water and gas production amounts under given hydro-geological conditions are calculated.Comparative analysis shows that theoretical curves are in good agreement with production and it is practicable utilizing theoretical model to predict the production capacity of coalbed gas wells.In view of the lower theoretical water and gas production amounts author points out that it is mainly influenced by compression fracture in production process.Compression fracture in initial production stage increases the permeability of coal reservoir,which causes the actual value larger than theoretical value.