Study On The Technology Of Gas Drainage Pvc Sieve Pipe Hole In Complex Coal Mine In Two Huai Mining Area

Gas drainage drilling is the most effective means of gas extraction,but with the enlargement of production scale and the increase of mining depth,the geological condition of mine becomes more complex.Especially the drilling geological anomaly zone,fracture zone,soft broken coal seam faults,the stability of hole wall and drilling difficult,caused by drilling,buried drill hole accident,seriously restrict the gas drainage borehole depth.It is one of the main research contents that how to adopt effective drilling method to solve the difficult formation of complicated coal seams.Through consulting a large number of domestic and foreign literature,history and current situation of summarizing the coal seam gas drainage drilling technology,research and development prospects of hole wall stability,horizontal drilling and coal seam drilling technology and screen protecting hole craft research history and current situation.Studied and studied the theory and method of stability analysis of horizontal borehole wall of coal seam by predecessors,and put forward the viewpoint of coal seam horizontal drilling construction technology and stability analysis of borehole wall.Based on the full use of the existing data collection,analysis and research of the two Huai coal mine coal properties,the two Huai coal mine coal rock fissure and the physical characteristics,so as to analyze the two Huai coal mine gas drainage drilling hole causes low efficiency,hole depth,hole protection difficult.At the same time,through to the domestic and foreign existing coal seam gas drainage in horizontal drilling of drilling technology,and use advanced technology of oil drilling,geological drilling,thus forming a suitable two Huai coal mine complex coal seam gas drainage drilling technology.Mining level borehole hole protection technology based on the analysis of the domestic and foreign existing coal seam gas drainage;and from oil drilling,geological drilling and other advanced technology;aiming at protecting hole drilling in seam gas drainage in two Huai coal mine problems,in-depth study in the aspects of selection,selection and improvement of drilling rig,PVC screen,forming a for two Huai coal mine complex coal seam gas drainage technology and equipment for drilling hole protection.The optimized application of indoor hole technology and equipment in two Huai coal mine gas control engineering,explore the new technology and equipment for the site,and through the field test in two Huai coal mine more than mine,wide applicability of new technology and equipment;thus,an effective solution to two Huai coal mine gas drainage drilling hole,low efficiency of hole depth,hole protection to the end hole technology and equipment.