Research And Production Capacity Simulation Of Gas Well Drainage System In Low Permeability Coal Seam

In CBM development process,formulating a reasonable mining system can reduce the damage of coal reservoir during drainage process of the coalbed methane and increase production capacity,improve recovery of the important safeguards.Based on studies of domestic and foreign literatures,coal-bed gas geology and percolation mechanics theory,using COMET3 coalbed gas reservoir engineering simulation software,and in the way of the actual field data analysis,theoretical research and reservoir simulation,it studies the gas reservoir characteristics occurrence,migration and production mechanism of low permeability coalbed.Based on the production of vertical coalbed methane well and drainage characteristics,it has carried on the row of division of the production phase,drainage and mining process of the coal reservoir permeability of main influence factors are analyzed.Analysis and research of the mathematical model and rules of permeability changes in the process of coalbed methane production in low permeability,simulation is used to study the effect of permeability of coalbed gas well productivity.According to the four characteristics and four basic principles of CBM well drainage,the main influencing factors and the control parameters and their influences to the production capacity of the vertical well drainage are analyzed.According to the previous research and the permeability change control factors and the change rule,the reasonable drainage system in different discharge stages is proposed,which provides a favorable reference for the coal bed methane drainage.Finally,combined with the FK01 well storage layer geological parameters and production data,and the characteristics of production and drainage system of the principles of the established mathematical model,capacity numerical simulation,drainage system formulation and optimization and application analysis is done by using comet3,so as to enhance understanding on coal seam gas discharge production system,improve capacity to provide certain reference and basis.for CBM vertical wells drainage system optimization.