临汾地区煤层气井产层组合方式对产能的影响研究

Impact of Producing Layers Combination on Capacity of Coalbed Methane Well in Linfen Block

分析了临汾地区5#、8#、9#煤层在不同组合方式下的气井排采效果,得出了合采5#+8#或5#+9#煤层组合的气井产能优于单采5#煤层及合采5#+8#+9#或5#+砂岩层+9#煤层组合的气井产能,并依据现场测试数据及理论计算,深入研究了产层间地质条件差异对煤层气井产气效果的影响,结果表明:层间水文地质条件、压力系统及渗透性、含气性及胶结程度、总资源量的差异是引起煤层气井产能好坏的主要原因。

Analysis is made about the drainage performance of gas wells under different combination of coal seams （5#, 8#. 9#） in Linfen block. It illustrates that the productivity under multi -layer production of 5# ＋ 8# or 5# ＋ 9# is better than that under single -layer production of 5# and multi -layer production of 5# ＋ 8# ＋ 9# or 5# ＋ sandstone ＋ 9#. Based on the test data and theoretical calculation, the impact of interlayer geological condition differences on CBM well capacity are studied intensively. The result shows： the main reasons affecting the capacity are the interlayer differences of hydrogeological conditions, pressure and permeability, gas content and cementation, and total resource.