Diamond Bits
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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 |
| 5 | Medium Hard Abrasive Moderately To Slightly Broken |
Limestone,Dolomite Weathered Granite WeatheredGneiss.Serpentinite Metaperidotite |
| 6 | Medium Hard Moderately Abrasive Moderately ToSlightlyBroken |
Diorite,Gabbro,Peridotite Gneiss,Basalt Andesite |
| 7 | Medium Hard-Hard Moderately Abrasive Slightly Broken To Competent |
Metabasalt,Amphibolite Metamorphosed Diorite Metamorphosed Gabbro, Diabase |
| 8 | HardSughtly/Abrasive Competent | Quartz-Rich Skam, Granite,Pegmatite |
| 9 | 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
