Dimatec Inc. - Wear Patterns (3 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.)

Excessive Diamond Exposure

Click on the illustration for photo (92kb)

In this wear pattern, the metal-bond matrix abrades away before the diamond crystals have become worn. As there is insufficient metal-bond matrix material to support the over-exposed diamond crystals on the bit face, the diamonds are released from the matrix material prematurely resulting in low bit life. Possible causes and solutions:

The penetration rate is too high for the rotational speed in use (overfeeding) - Reduce the penetration rate or increase the rotational speed.
The matrix type is too soft for the ground conditions - Change to a harder (lower number) Dimatec “D-Series” or “HR-Series” matrix type

Glazed Bit Face

Click on the illustration for photo (82kb)

In this condition, the diamond crystals on the bit face have become completely embedded in the metal-bond matrix. Sandblast the bit face in order to re-expose the diamond crystals. Try drilling with a slower rotational speed and/or a lower in-hole fluid circulation rate in an effort to cause the metal-bond matrix to abrade at a higher rate that will cause the diamond crystals to become exposed more readily. If the bit face glazes repeatedly, change to a softer (higher number) Dimatec “D-Series” or “HR-Series” matrix type.

Burnt Bit Crown

Click on the illustration for photo (88kb)

This condition is the result of a significant loss of fluid circulation across the bit face. Possible causes for this condition include:

The operational failure of the fluid circulation pump.
Excessive circulation fluid leaks in the drill rod string, water swivel or hoses.
Internal core barrel fluid restrictions resulting from the incorrect adjustment of the wireline inner tube assembly.
One or more waterway canals on the bit crown are blocked by pebbles or other debris.

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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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