Experimental study of shock pressure and erosion characteristics of high‐pressure gas–liquid two‐phase jet: Exploration for improving coalbed methane extraction efficiency

Coalbed methane extraction promotes energy exploitation and alleviates the greenhouse effect. This study aimed to analyze technical potential of a high-pressure gas–liquid two-phase jet in increasing coalbed permeability promoting extraction. A well-designed experimental setup was used investigate erosion characteristics jet. Through shock pressure monitoring tests jet, effects pump pressure, mixer structure, nozzle structure on rock-breaking performance were studied, mechanism examined. The results showed that nonuniformity mixing expansibility gas continually alters jets between single multiple streams, which makes show obvious pulse considerably improves performance. Furthermore, reasonable air water settings significantly increase area, whereas maximum only decreases slightly. Although with its efficiency first increases then pressure. To improve is crucial, but optimal differs for different pressures. Additionally, greater angle liquid inlets, loss fluid during mixing. Finally, single-cone nozzle.