Product Description:
Surface set core bits, as the name suggests, are set with a single layer of natural diamonds on the working surfaces of the bit crown, arranged in a specific pattern.
Unlike impregnated diamond bits where controlled erosion of the matrix crown is required to expose new diamonds, the matrix bond used in surface set bits is extremely tough and wear resistant. The only function of the matrix on a surface set bit is to securely hold the diamonds in position throughout the operational life of the bit.
Surface set bits are used for drilling soft, abrasive, unconsolidated formations that are not effectively drilled by impregnated diamond bits. They can also be used for drilling harder formations with low powered drills, where the rotational speed or bit load produced is not sufficient to run impregnated bits.
Surface set bits provide higher rates of penetration than impregnated bits in soft formations due to the greater degree of exposure of the individual diamond stones. However, as they are set with only a single layer of diamonds, they generally yield a lower overall bit life.
Available with a range of diamond stone sizes and crown profiles to suit different rock formations.
| Diamond Size | Formation Drilled |
| 10/20 SPC* | Soft formation |
| 20/30 SPC | soft to medium formation |
| 30/40 SPC | medium formation |
| 40/60 SPC | Medium to hard formation |
| < 60/80 SPC | Very hard formation |
| *SPC is short for Stone per Carat. | |
Advantages:
Can be cost-effective for coring soft formations;Can be used with low powered drills
How to select a shape?
SEMI-ROUND: Standard profile, ideal for most ground conditions.
ROUND: Preferred profile for harder, abrasive ground conditions with rocks.
STEP: A profile that provides a faster rate of penetration, but is a bit more fragile especially in fractured ground. Generally used with wireline core barrel systems.
PILOT: A profile that provides good stability, and a good rate of penetration and recovery. Ideal for soft to medium ground.
ANGLED PILOT: A very durable profile that provides good stability. Ideal for ground that is very fractured.
FACE DISCHARGE: A profile that helps in the recovery of core samples in very fragile ground.
These bits are often custom made depending on the rock formation, you can specify:
✔ Diamond size and grade
✔ Number of waterways
✔ Number of steps (Multistep Profile)
✔ Junk slots (Multi-Step Profile)
✔ Heavy duty gauge protection
How to select BQ, NQ, HQ, PQ?
The BQ, NQ, HQ, and PQ sizes of Surface Set Diamond Core Bits are specifically designed to meet the needs of different drilling applications.
The BQ size is commonly used for shallow drilling in soft to medium-hard rock formations, while the NQ and HQ sizes are suitable for deeper drilling in harder rock formations.
The PQ size is designed for ultra-deep drilling in the most challenging geological conditions, providing maximum performance and durability.
Our advantage:
1. Enterprise group combines manufacture and international trade;
2. Strict quality controll system with perfect equipment;
3. High technology enterprise with advanced production equipments;
4. Prompt delivery and all-around after-sales service;
FAQ
A: Are you trading company or manufacturer ?
Q: We are manufacturer.
A: Do you provide samples ?
Q: Yes, of course. We welcome sample order to test and check quality.
A: Can you accept small orders?
Q: We enjoy to cooperate with all clients whatever big or small order.
A: Could you accept OEM & ODM?
Q: Of course, as a manufacturer, OEM & ODM is available, our professional R&D center can help you on the project.
A: How long is your delivery time?
Q: Usually it's about 20 days,depends on your actual quantity.
Any question, pls feel free to contact . Thanks!