页岩岩心活性水浸泡前后渗透率变化规律实验研究

运用非稳态脉冲超低渗透率测量仪对页岩储层渗透率进行测量,得到页岩渗透率随孔压、轴压和围压的变化规律并且确定了页岩的应力敏感性和各向异性,为页岩储层渗流特性研究提供了理论基础。通过页岩在特定的工作液中污染不同的时间前后的渗透率变化,来反映工作液对页岩储层的伤害程度。研究成果可为页岩气井钻完井、增产改造和开采过程中储层保护提供基础参数。

Experiment Research on Shale Core Permeability Variation Before and After Active Water Immersion

The non-steady state impulse ultra-low permeability survey instrument was used to measure shale core permeability,change of the shale permeability with the pore pressure,axial pressure and confining pressure was obtained,and the stress sensitivity and anisotropy of the shale were determined,which could provide a theoretical basis for study on shale reservoir seepage characteristics.The change of permeability of the shale polluted by specific working liquid for different time reflected the damage degree of working liquid to shale reservoir.The research results can provide basic parameters for reservoir protection in the process of shale gas well drilling and completion,production and exploitation.