煤层气井初期排水速率模型及其应用分析

Analysis of Model of Drainage and Its Application in Initial Stage of CBM Wells

为了确定在煤层气井排采初期的排水速率对产气阶段的影响,根据渗流理论以及地下水动力学,建立产水阶段的排水模型,通过对比理论模型与实测资料,得出樊庄区块的排采速率在0.89~6.28 m^3/d。提出产能评价指标,分析得出,制定一个合理的排水速率对于提高产能是十分必要的。

In order to determine the impact of drainage rate in initial stage of CBM wells on gas production stage, according to seepage theory and Groundwater Dynamics,the draignage model of drainage stage which was established. Through comparion for the rate which was calculated by theoretical model and the production data. The results show that,the rate on Fanzhuang block was between 0.89-6.28 m3/d. Evaluation criteria was put forward,a conclusion is drawn that a reasonable drainage rate which was setted out for promoting production was necessary.