老石旦煤矿缓坡斜井大口径通风立眼钻孔关键技术

Raise Boring of Large Diameter Ventilation Holes in Slow Inclined Shafts in Laoshidan Coal Mine

通过老石旦煤矿缓坡斜井通风立眼的施工,叙述了钻遇采空区的几项施工关键技术。针对大口径通风井过采空区、井较深、井径较大的特点,采用大孔径反井成孔工艺;导向孔采用无线随钻定向技术,后改用无磁单点测斜潜孔锤定向技术;采用技术套管隔离的方法进行了管底特殊处理,保证技术套管顺利起拔;悬空固井技术,大直径套管人工柔性井底的制作等;对大孔径反井施工工艺技术进行了系统全面介绍,并对反井施工过程中发现的问题及取得成果进行的总结,为类似工程的施工具有示范效应。

The key technologies for drilling in goaf were elaborated in the construction of ventilation holes by raise boring in the slow inclined shaft in Laoshidan coal mine.In view of the characteristics of large diameter ventilation holes passing through the goaf,deep wells and large diameters of the shaft,the large diameter raise boring process was adopted;the pilot holes were drilled with wireless directional drilling technology,and then the orientation technology of non-magnetic single point inclinometer DTH hammer was followed;the special treatment of the pipe bottom was carried out by the technical casing isolation method to ensure the smooth lifting of the technical casing;cementation of free casing and the large diameter casing artificial flexible bottom were also employed,etc.The large diameter raise boring technology is comprehensively introduced,with the problem and achievements in the raise boring process summarized.It has a demonstration effect for similar construction.