Dimatec Inc. - Wear Patterns (2 of 3)

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Click on any of the illustrations below to view actual photos of the corresponding wear pattern. (Image size ranges from 88kb to 115kb.)

Inside Diameter Gauge Loss

Click on the illustration for photo (87kb)

Possible causes and solutions:

Overfeeding the bit - Reduce the penetration rate.
Damage from drilling into highly unconsolidated material - Cement the drill hole or change to a harder (lower number) Dimatec “D-Series” or “HR-Series” matrix type.
Drilling over lost core - Examine the core tube contents.
Lack of fluid circulation - Check the inner tube length adjustment to ensure that there are no fluid restrictions within the core barrel assembly. Also check the in-hole circulation pump rate and the drill rod string for leaks

Cracked Waterways

Click on the illustration for photo (115kb)

Possible causes:

An excessive bit load was applied.
The bit, core barrel and drill rod string were accidentally dropped in the drill hole.
The wireline inner tube assembly was accidentally allowed to free fall through the drill rod string in a dry hole.
The bit was accidentally crushed by the rod holder or foot clamp

Concave Face Wear

Click on the illustration for photo (91kb)

This wear pattern frequently results from the use of a penetration rate that is too high for the rotational speed being used (overfeeding). This wear pattern is also caused by “grinding core”.

Convex Face Wear

Click on the illustration for photo (96kb)

Possible causes and solutions:

Insufficient fluid circulation across the bit face - Check the circulation pump and drill rod string for leaks; increase the pump rate.
Repeated in-hole “dry-stripping” in hard, non-abrasive formations - Change to a softer (higher number) Dimatec “D-Series” or “HR-Series” matrix type

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	New Condition

	Ideal Wear Pattern

	Normal Retirement

	OD Gauge Loss

	ID Gauge Loss

	Cracked Waterways

	Concave Face Wear

	Convex Face Wear

	Excessive Diamond Exposure

	Glazed Bit Face

	Burnt Bit Crown



	Matrix Selection Chart

	Impregnation Depth

	Waterway Configurations

	Gauge Setting Options

	Bit Crown Profiles

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