Influence of High-rank Coal Reservoir Sensitivity on Coalbed Methane Wells Production
BAI Jian-ping
Abstract：In order to realize the efficient exploitation of coalbed methane in high-rank coal reservoir,the velocity sensitivity and stress sensitivity of Sihe No.3 coal seam were experimented and analyzed.Based on the engineering,the influence of high-rank coal reservoir sen-sitivity on coalbed methane wells production was analyzed.The experimental results showed that,high-rank coal reservoir had the feature of velocity sensitivity,the permeability could reduce to 50% of initial value to the maximum extent,directional flooding would also reduce per-meability,the minimum reduce to 62.1% of initial value,the higher the clay content of the reservoir was,the lower the permeability decrea-sing amplitude would be.The high-rank coal reservoir had a strong stress sensitivity and existed apparent irreversibility;when the net confi-ning pressure increased from 2 MPa to 5 MPa,the permeability decreased as 20%~50% of the initial permeability,after the buck boost, the permeability could not resume to the initial level,the maximum of irreversible damage rate was more than 50%,the lower the reservoir permeability was,the stronger the stress sensitivity would be.The coalbed methane wells production process should follow continuous,slow and stable principle,especially in initial stage.
Keywords：high-rank coalcoal reservoircoalbed methane wellsvelocity sensitivitystress sensitivity
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 54-57 )