Research On Theory Of Gas Field And Application In Gas Extraction Of Coal Bed

To provide theoretical guidance for gas extraction, the gas field theory was established,delivery law of gas extraction was researched by establishing the gas potential equation and gasflow equation. Based on the gas field theory, drilling parameters optimization function wasestablished to provide drilling parameters optimization program. Considering the superpositioneffect, analysis and calculation the emission of gas from several drillings, the scheme for drainagedrilling parameters optimization is given. With the application condition, the equations to simulatethe compliance by COMSOL, the results prove the consistency. Fluid solid coupling model ofTunlan coal mine12503working face of the coal seam drilling drainage migration is studiedthrough coal seam gas and water two-phase flow. The analysis and simulation, combined with thetheory of gas migration in coal seam gas drainage technology, conformance with the coal seam gasfield drainage optimization function. The gas drainage working condition in Xishan mining areawas analysed, drainage holes were optimized in field with drilling parameters optimizationfunction and the result is consistency.