Reservoir Engineering in Coal Seams: Part 1-The Physical Process of Gas Storage and Movement in Coal Seams

摘要: This is the first of two papers concerning movement gas in coal seams. It deals directly with physical behavior seam as a reservoir. Coal seams show considerable differences from normal porous reservoirs both mode storage and permeability characteristics. Most by sorption into structure, while cleat-(fracture-) or joint-controlled may vary over wide range during production. fluctuation not solely phase relative effect, but rather result opposing effects effective stress increase fluid pressure reduction shrinkage coal. Reducing tends to close cleats, reducing permeability, open them.