Research on diffusion law of CO gas consistency in high-energy gas fracturing

At present,high-energy gas fracturing is widely applied in the low permeable oil-gas field,which is available to remove pollution and clogging caused by drilling and perforating.As a result,the objectives of increasing the output of oil and gas wells and the injection rate of injection wells are realized.But recently,CO poisoning events have occurred frequently,causing huge damage to some low permeable oil-gas field and the staffs.To solve this problem,a CO gas well-bore flow and atmospheric diffusion model is established based on the comprehensive research on CO gas flow and diffusion through utilizing field data,physical and mathematical simulation methods.In addition,the main factors of well-bore pressure,gas-oil ratio,wind speed,leakage speed,atmospheric stabilization,etc.that influence CO gas diffusion are investigated.Field application shows that the model has high accuracy.The research provides a technical basis to establish the supervising system and is very important for reasonably and effectively developing oil and gas fields as well as or coal bed methane.