How to choose the right drill bit
Choosing the right drill bit is critical to the success of water well drilling.
The type, size and material of the bit directly affects drilling speed, hole quality and overall rig performance. Here are some key considerations:
Lithology: Different lithologies require different drill bits. Soft rock can be drilled with an auger bit, while hard rock requires a diamond or PDC bit.
Stratigraphy: If there are hard interbedded or fractured zones in the formation, a bit with good abrasion resistance is required.
Depth: The depth of the hole determines the length and strength of the bit.
Diameter: The diameter of the hole influences the size and type of bit.
Rig power: The power of the rig determines the load the bit can carry.
Flushing method: Different flushing methods, such as air flushing, mud flushing or foam flushing, have different requirements for the drill bit.
Drilling speed: Excessive drilling speed can lead to overheating or damage to the drill bit.
Carbide: Good abrasion resistance, suitable for hard rock.
Diamond: Highest hardness, suitable for ultra-hard rock.
Polycrystalline diamond (PDC): Good abrasion resistance, suitable for various formations.
Drill shapes: core drills, multi-wing drills, etc.
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