Impregnated Bit Wear Pattern Guide

Impregnated Bit Wear Pattern Guide

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Impregnated Bit Wear Pattern Guide


 Impregnated Bit Wear Pattern Face Glazed
Face Glazed

Causes: Bit series is to low.
Recommendation: Change to a higher series bit.

 Impregnated Bit Wear Pattern Excessive Diamond Exposure
Excessive Diamond Exposure

Causes: Overfeeding.
Recommendation: Increase RPI (RPC); Change to a lower series bit.

 Impregnated Bit Wear Pattern Cracked Waterways
Cracked Waterways

Causes: Excessive WOB; Dropped rods; Inner tube free fall in a dry hole.
Recommendation: Replace bit.

 Impregnated Bit Wear Pattern Burnt
Burnt

Causes: Lack of water/fluid; Excessive WOB
Recommendation: Check for pump and rod string leaks;  Increase pump output;
Reduce WOB.

 Impregnated Bit Wear Pattern Concave Face Wear
Concave Face Wear

Causes: RPI (RPC) too low; Over drilling.
Recommendation: Reduce RPM or ROP.

 Impregnated Bit Wear Pattern Convex Face Wear
Convex Face Wear

Causes: Lack of water/fluids.
Recommendation: Check for pump and rod string leaks; Increase pump output.

 Impregnated Bit Wear Pattern I.D. Gauge Loss
I.D. Gauge Loss

Causes: Lack of water/fluids; Overfeeding.
Recommendation: Increase RPI (RPC); Check for pump and rod string leaks;
Increase pump output.

 Impregnated Bit Wear Pattern O.D. Gauge Loss
O.D. Gauge Loss

Causes: Lack of circulation; Bit vibration.
Recommendation: Check for pump and rod string leaks; Increase pump output;
Adjust RPM.

RPM - Revolutions Per Minute
WOB - Weight On Bit
ROP - Rate Of Penetration 

RPI - Rotations Per Inch
RPC - Rotations Per Centimeter 

 

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