大口径工程井井身结构和成孔方法探讨

Borehole structure and drilling method for the large diameter borehole

摘要:

近年来，国家对矿井安全、职工健康、环境保护等方面越来越高度重视，大口径工程井已广泛应用于矿山企业瓦斯抽排、注浆堵水、输氮灭火、送冰降温、排水通风、抢险救援等领域。大口径工程井直径一般在?500~1500 mm、深度1000 m以浅。科学选择和设计井身结构和成孔方法，能最大限度地降低施工成本，提高钻进效率和钻孔的安全程度。

Abstract:

In recent years， with the national emphasis on mine safety， vocational health， environmental protection and other aspects， large diameter boreholes have been widely used for gas drainage， water cut-off grouting， supply of nitrogen gas for extinguishing， supply of ice for cooling， drainage and ventilation， emergency rescue， etc. in mines. The large diameter boreholes range from ?500 mm to 1500 mm in diameter with depth less than 1000m. Proper selection and design of the borehole structure and the drilling method can minimize construction cost， and improve drilling efficiency and drilling safety.