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what are the normal problems of the water well drilling bit

 1. Drill bit wear

Cause:
High formation hardness and abrasiveness
Unreasonable setting of drilling parameters, such as too high drilling pressure and too high rotating speed
Poor performance of drilling fluid, lubrication and cooling effect is not good
Poor bit material or heat treatment process
Performance: Blunting, chipping, chipping angle, flattening, rounding, etc. of tooth edge
Impact: Decrease in drilling speed, increase in drilling cost, decrease in drilling quality.

2. Drill bit fracture
Cause:
Excessive impact load, such as encountering hard objects or sudden changes in the formation.
Excessive torque, exceeding the torque limit of the drill bit.
Defective material of drill bit
Loose tool joints
Manifestation: The drill bit breaks into several pieces and the drilling tool is stuck in the well.
Impact: Drilling operations are interrupted, making salvage more difficult and causing economic losses.

3. Drill bit sticking
Cause:
Poor performance of drilling fluid, high viscosity or excessive solid content.
The formation is viscous and easily adsorbs the drill bit.
Excessive drilling pressure, resulting in excessive friction between the drill bit and the well wall.
Manifestation: Difficulty in lifting the drilling tool and rotating it.
Impact: Drilling operations are interrupted, making it more difficult to unjam the drill bit.

4. Drill bit jamming
Cause:
Ground collapse, clogged with drill cuttings.
Drill bit falls into crack or hole
Kinking or jamming of drilling tools
Manifestation: The drill tool cannot move up and down or rotate.

Impact: Drilling operations are interrupted, making it more difficult to unjam the drill tool, or even leading to tool scrap.


5. Drill Bit Grinding
Cause:
The centerline of the drilling tool does not coincide with the centerline of the borehole.
Poor performance of drilling fluid and poor flushing effect.
Uneven stratigraphy and large difference in hardness
Manifestation: Drilling is skewed and the hole diameter is not round.
Impact: Affect the quality of the borehole and increase the amount of casing work.

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