煤矿井下定向钻孔套铣打捞实施关键技术研究

Research on Key Technology of Casing Milling and Fishing Implement in Coal Mine

通过分析多个定向钻孔套铣打捞应用案例的实施数据,对套铣打捞实施过程中的套铣钻头选择、套铣回转速度控制、套铣异常情况处理等关键技术进行了研究。研究结果表明:φ168 mm和φ153 mm这2种套铣钻头对套铣打捞的影响基本一样,从套铣孔径级配考虑,应优先使用φ168 mm套铣钻头;套铣回转转速在30 r/min时可以获得最佳的套铣打捞效果;对于异常情况的处理,要灵活运用冲洗液、短扫孔作业和扩孔技术,其中短扫孔作业间距控制在15~30 m。

Through the analysis of multiple directional drilling casing milling and fishing application case implementation data,research on the key technology of selection of casing milling bit,control of the casing milling speed and handle the abnormal situation of casing milling.The result of research shows that the casing milling bit size of φ168 mm and φ153 mm has the same effect on casing milling and fishing,consider from casing milling aperture grading,should be given to φ168 mm priority,the best fishing effect of casing milling can be obtained when the rotating speed is 30 r/min,in order to handling the abnormal situation,should use the technology of washing fluid and short hole cleaning and hole expanding flexibility,and the interval of short hole cleaning is 15 to 30 m.