Surface Set Diamond Bits

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Description

Core Drilling Diamond Bits 

Diamond core drilling involves the use of a diamond-impregnated drill bit to extract cylindrical samples of the subsurface. The drill bit consists of a steel tube with industrial-grade diamonds embedded in the cutting surface. As the bit rotates, these diamonds grind away the rock, creating a core sample that remains inside the tube.

 

Varieties of diamond Bits are used in Geological core drilling application. However, the most popular types are Impregnated diamond Bits, surface set diamond bits, PDC bits, reaming shell and casing shoes.

 

Selection of Bits type are basically determined by ground conditions of drilling task. The good matching of bits selected to the right rock formation of drilling will guarantee the faster penetration rates across different ground condition.

 

The most popular reference referred to for Diamond Bit selection are Mohs Scale of mineral hardness which is very helpful.

For Matrix Selection of the bit for adaptation to ground condition and geological formation of the minerals core rigs explores.

 

Mohs Scale of Mineral Hardness

In 1812 the Mohs scale of mineral hardness was devised by the German mineralogist Frederich Mohs (1773-1839), who selected the ten minerals because they were common or readily available. The scale is not a linear scale, but somewhat arbitrary.

 

Hardness

Mineral

Associations and Uses

1

Talc

Talcum powder.

2

Gypsum

Plaster of Paris. Gypsum is formed when seawater evaporates from the Earth’s surface.

3

Calcite

Limestone and most shells contain calcite.

4

Fluorite

Fluorine in fluorite prevents tooth decay.

5

Apatite

When you are hungry you have a big "appetite".

6

Orthoclase

Orthoclase is a feldspar, and in German, "feld" means "field".

7

Quartz

Watches, mood stones

8

Topaz

The November birthstone. Emerald and aquamarine are varieties of beryl with a hardness of   8.

9

Corundum

Sapphire and ruby are varieties of corundum. Twice as hard as topaz.

10

Diamond

Used in jewelry and cutting tools. Four times as hard as corundum.

 

ROCK GROUP FORMATION DESCRIPTION ROCK TYPE
1-4 Soft To Medium Hard
Extremely To Slightly Abrasive
Extremely To Slightly Broken
Shale,Sandstone,
Limestone
Medium Hard
Abrasive
Moderately To Slightly Broken
Limestone,Dolomite
Weathered Granite
WeatheredGneiss.Serpentinite
Metaperidotite
Medium Hard
Moderately Abrasive
Moderately ToSlightlyBroken
Diorite,Gabbro,Peridotite
Gneiss,Basalt Andesite
Medium Hard-Hard
Moderately Abrasive
Slightly Broken To Competent
Metabasalt,Amphibolite
Metamorphosed Diorite
Metamorphosed Gabbro,
Diabase
HardSughtly/Abrasive Competent Quartz-Rich  Skam,
Granite,Pegmatite
Very Hard
Suighty Abrasive Or Non-Abrasive
Very Competent
Metamorphosed Granitic Rock.
Quartz-Rich Gneiss
10  Extremely Hard
Non-Abrasive
Fine Grained To Amolphous
Very Competen
Chert Jasperite,Quartzite
HighlyMetamorphosed Volcanics

We preset this note with sincere gratitude to Di-Corp for quoting this Chart from their web It will be removed upon any notice for disagreement over posting this chart on our website.

 

2.5 Fingernail

2.5–3 Gold, Silver

3 Copper penny 4-4.5 Platinum

4-5 Iron

5.5 Knife blade

6-7 Glass

6.5 Iron pyrite

7+ Hardened steel file

Surface Set Diamond Bits

Core Drilling Surface Set Diamond Bits 

Surface Set Bits are produced by a single layer of diamonds set in a specific pattern on the working face of the bit crown with a hard matrix.

This type of bits can be selected for ground formation range from soft to hard status.

It is important to prepare a careful analysis of geological formation, diamond size needed, the right grade and profile to match the bits selected to secure better penetration rate of drilling with less wear to be more economic and productive.