Study on Pressure Drop Transmission Law of Coal Bed Methane Drainage Reservoir Stratum
Abstract：Based on the seepage mechanism in seam, a mathematical model of the seam pressure distribution was established, the pres- sure distribution conditions of the seam during the gas drainage process were calculated and the pressure drop transmission law of the seam was revealed. The Matlah7.11 was applied to simulate the coal bed methane reservoir stratum pressure drop transmission conditions of a mining block in Jincheng Mining Area and analyze the factors affected to the pressure drop speed, the pressure drop size and the pressure drop transmission distance. The study showed the seam permeability, porosity and compression coefficient as well as the water drainage time would have high influences to the pressure drop speed at each point in the seam. The pressure drop would he positively related to the water drainage value, effective thickness of the seam, permeable rate of the seam, porosity, gas drainage time and water content of seam. The seam permeable rate, porosity and gas drainage time would be positively related to the pressure drop transmission distance in seam.
Keywords：coal bed methanepressure drop corncritical desorption pressurepressure drop speedpressure drop transmission law
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 65-68 )