【摘要】 分析论述了粘土质裂隙地层空气泡沫钻进的有关工艺；裂隙发育硬岩地层空气泡沫潜孔锤钻进的有关工艺；在空气泡沫钻进过程中应注意的有关操作事项；钻具级配对钻进效果的影响程度。更多还原

【Abstract】 This paper analyses and expounds :thetechniques relating to foam drilling in Clayey Crackformation and by down hole hammer in cracky hardrock formation;Somee methods of operation in theprocess of drilling;the degree of holding up drillingby pipe grade。更多还原