Research and application of coal seam pulse hydraulic fracturing technology
Abstract：In order to improve the gas drainage efficiency of high gas and low permeability coal seams,the pulse hydraulic fracturing technology was proposed,hydraulic fracturing experiments and mechanical analysis were taken under different pressures and frequencies,and fatigue damage characteristics of coal and the mechanism of high pressure pulse hydraulic fracturing were analyzed too.The results show that alternating stress is formed at the end of coal fracture under the action of the intense pulse water,and fatigue damage failure can be formed in the coal due to repeated action of compression-expansion-compression.The extension of fracture and weak plane in the coal is transformed into interlaced transfixion fracture network.Compared with general methods of hydraulic fracturing,the results of industrial experiments show that pulse hydraulic fracturing generates a better effect of pressure relieving and permeability improving,meanwhile,the concentration and flow of drilling gas extraction are remarkably improved.
Keywords：pulse hydraulic fracturingpressure relief permeability improvementfatigue damagegas drainage
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)