NMLC Surface Set Diamond Drilling Bits
The surface set diamond bit is produced from a single layer of natural diamond setting on the surface of bit crown with hard matrix.
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Surface set diamond bit is mainly recommended for drilling soft to hard formations. Generally speaking, surface set diamond bit can provide satisfying penetration rate.
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To choose a right surface set for the formations drilled, we need at least consider the following aspects: diamond size, diamond grade, profile design.
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Principle of choosing diamond size--the harder the rocks, the smaller the diamond size should be.
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Diamond Size
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Formation Drilled
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10/20 SPC*
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Soft formation
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20/30 SPC
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soft to medium formation
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30/40 SPC
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medium formation
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40/60 SPC
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Medium to hard formation
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< 60/80 SPC
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Very hard formation
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*SPC is short for Stone per Carat
**40/60 is Forsun standard diamond size for natural diamond core bit
***Other sizes are available as per request
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