滑脱效应影响的低渗储层煤层气运移解析分析

Analytical solution of coal-bed methane migration with slippage effects in hypotonic reservoir

采用理论分析方法建立了滑脱效应影响的低渗透储层煤层气运移的数学模型,得到了有限长煤层气体稳态流动的采场压力分布解析式;无限长煤层和球向坐标煤层气体瞬态流动的采场压力分布解析式和相应的产量预测公式。通过具体矿区实例分析了抽采过程中低渗透储层滑脱效应影响的采场压力变化规律和气体产量预测规律。

Used theoretical analysis the single-phase gas seepage mathematical model influence by slippage effects was established,obtained the gas steady-flow analysis formula of pore pressure distribution in the finite coal bed; the gas transient flow analysis formula of pore pressure distribution in infinity and sphere coordinate coal bed and gas output prediction formula with gas slippage effects.Through the specific example analyzed the law of the stope pore pressure and gas output forecast changing in hypotonic reservoir with slippage effects in the mining process.