地面抽采与井下抽采煤层气成本分析研究

Study on Cost Analysis of Coal Bed Methane from Surface Borehole Gas Drainage and Underground Mine Gas Drainage

为对比研究地面抽采煤层气成本与井下抽采瓦斯成本,以焦坪矿区下石节井田地面煤层气试验井储层测试参数和历史排采数据为基础,利用目前国际上较为先进的煤层气储层数值模拟软件CBM-SIM,对煤层气井的产能和抽采效果进行了预测分析,进而研究分析了在达到同样抽采效果的前提下,地面抽采与井下抽采煤层气的成本费用。结果显示:为了使瓦斯含量降至1m3/t以下,地面抽采需要12.5a,成本9.09元/t;井下抽采成本16元/t,地面抽采成本远远低于井下抽采。

In order to compare and study the cost of the coal bed methane from the surface borehole gas drainage and the underground mine gas drainage, based on the reservoir measured parameters of the surface coal bed methane test well and the historical gas drainage data of Xiashijie Minefield in Jiaoping Mining Area as a base, with the application of the international advanced coal bed methane reservoir numerical simulation software CBM - SIM, a prediction analysis was conducted on the production capacity and the gas drainage effect of the coal bed methane well. On the premise of same gas drainage effect reached, the cost of the surface borehole gas drainage and underground mine gas drainage were studied and analyzed. The results showed that in order to make the gas content reduced to below lm3/t, the surface gas drainage would need 12. 5 year, the cost would be 9. 09 RMB/t. The underground mine gas drainage cost would be 16 RMB/t and the surface gas drainage cost would be far less than the underground mine gas drainage cost.