How to choose the suitable head face of the DTH drill bit? Concave: Suitable for all kinds of formation, especially for deep well drilling, perpendicularity of the hole is wonderful. Convex: Suitable for the formation of moderate hardness stratum, drilling efficiency is good, borehole perpendicularity is moderate. Flat: Suitable for special hard formation stratum, especially for fracture, crack spacing and complex formation drilling effect is very good, has the good perpendicularity of the borehole.
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