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A new method of drilling long boreholes in low permeability coal by improving its permeability

Geotechnical EngineeringEngineeringCivil EngineeringFormation EvaluationMining EngineeringNew MethodLow Permeability CoalDrilling Long BoreholesCoal BasinPetroleum EngineeringDrillingCoal Bed MethaneDrilling Engineering