大口径瓦斯抽排井施工扩孔分级设计优选探讨

Discussion on Optimization of Reaming Grading Design of Large Diameter Gas Drainage Well Construction

受现有钻探设备能力限制,大口径瓦斯抽排井工程通常采用"先导钻进+分级扩孔"施工方法。通过扩孔所需回转扭矩的计算分析,对常用大口径瓦斯抽排井扩孔分级的设计进行了探讨。

Being confined to the capacity of existing drilling equipments,usually ＂pilot drilling ＋ hierarchical reaming＂construction method is used for gas drainage well. By the analysis and calculation of the rotary torque required by reaming,the discussion is made on reaming grading design of the common used large diameter gas drainage well.