煤矿井下分段水力压裂梳状定向长钻孔钻进技术研究

随钻测量梳状定向钻进技术目前主要应用于煤矿瓦斯防治、地质异常体探测和探放水等领域。但该技术还未与水力压裂增透强化抽采技术相结合应用于煤层瓦斯防治领域，由于水力压裂增透强化抽采技术对钻孔特殊要求，相应钻探装备、钻孔设计和钻进成孔工艺均需要进行研究突破。本次研究成果融合了井下梳状定向长钻孔瓦斯抽采技术及水力压裂增透强化抽采技术的优点，形成了一套适合分段水力压裂梳状定向钻孔施工设备及工艺流程，能够满足对松软煤层瓦斯远距离与区域增透技术的需求，解决松软煤层透气性差、瓦斯抽采孔成孔性差、抽采距离短、抽采区域小等难题。

Research on long hole hydraulic drilling with comb shaped directional drilling technology in coal mine

MWD comb directional drilling technology is mainly used in coal mine gas prevention and control, geological anomaly body detection and exploration & release of water and some other fields at present. However, this technology has not been combined with enhanced extraction technology by hydraulic fracturing permeability to apply in the field of coal seam gas prevention and control. Due to the special drilling requirement of enhanced extraction technology by hydraulic fracturing permeability, the breakthroughs should be made in drilling equipment, drilling design and hole completion. The results of this study combine the advantages of gas drainage technology by comb directional drilling and enhanced extraction technology by hydraulic fracturing permeability, a set of equipments and technological processes are formed, which is suitable to segmented hydraulic fracturing comb directional drilling construction, can meet the needs of long distance and regional permeability enhancing for the soft coal seam and solve the problems such as weak permeability of soft coal seam, poor gas extraction hole completion, short extraction distance and small extraction area.