Research on hydraulic direction technology for horizontal drilling of coal bed methane

This paper puts forward a new-type hydraulic direction technology for the horizontal drilling of coal bed methane(CBM) based on the deficiencies of the original direction methods such as the inconvenient operation,the jamming of the drilling tool,or the expensive price etc..It firstly analyzes the style of hydraulic rock fragmentation,deduces the computing expressions for the hydraulic injecting nozzle and the relationship between ejecting pressure and pump output.Further,it obtains two groups of data for correction distance and pump output,attacking times,and ejecting time,which shows the compatibility between theory and practice.The feasibility using in practical production of the hydraulic direction technology,one of the increasing production technologies of CBM,is proved through by theory and practice research.It will greatly reduce the cost on rectifying the deviation of the drilling and ensure the drilling quality.