模拟煤层气储层条件下煤岩渗透性实验研究

Experiment Study of Coal Permeability under Simulating in-situ Coalbed Methane Reservoir

储层煤岩特有的割理结构使其渗透性与常规砂岩储层不尽相同。以山西沁水盆地3#煤作为实验煤心,实验研究了围压、孔隙压力对煤岩渗透率的综合影响规律,并得到3#煤岩的裂缝体积压缩系数范围。研究表明,流体介质不同,储层煤岩渗透率在压降过程中变化趋势不同;储层煤岩裂缝体积压缩系数在整个煤层气开采过程中并非一恒定值。

Unique coal cleat system make the permeability of the coalbed methane reservoir different with the conventional sandstone reservoirs,using #3 coal of Qinshui as an experimental core,experimental study coal permeability under the confining pressure and pore pressure,obtain the range of fracture system pore volume compressibility.The results show that the variation tendency of coal permeability is different with the pore pressure reduced if the experimental fluid medium is different;fracture system pore volume compressibility of coalbed methane reservoir is not a constant value in the whole production process.