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NQ Reaming Shell Outer Diameter 75.5mm Core Reamer
NQ Reaming Sheel is a standard diamond reaming tool of the Q series used in geological rope core drilling. It is installed between the NQ diamond drill bit and the core outer pipe, and is used for reaming and maintaining the diameter, centering the drill tools, and protecting the outer pipe. It is a core supporting tool for medium and deep-hole geological exploration (≤1500m), mineral core extraction, and hydrological and water well drilling.
Compatible products: NQ drill pipe, NQ drill bit, NQ rope core dual pipe
English Name: NQ Reaming Shell/ NQ Diamond Reamer
Material: Diamond
Outer diameter: 75.7 millimeters
Minimum order quantity: 1 piece
Description
NQ Reaming Sheel is a standard diamond reaming tool of the Q series used in geological rope core drilling. It is installed between the NQ diamond drill bit and the core outer pipe, and is used for reaming and maintaining the diameter, centering the drill tools, and protecting the outer pipe. It is a core supporting tool for medium and deep-hole geological exploration (≤1500m), mineral core extraction, and hydrological and water well drilling.
Compatible products: NQ drill pipe, NQ drill bit, NQ rope core dual pipe
English Name: NQ Reaming Shell/ NQ Diamond Reamer
Material: Diamond
Outer diameter: 75.7 millimeters
Minimum order quantity: 1 piece
Specifications
| Size | Bit O.D.Hole Diameter（mm） | Bit I.D.Core Diameter (mm) | Reaming Shell O.D. (mm) |
| BQ | 58.9 | 36.4 | 59.95 |
| BQ3 | 58.9 | 33.53 | 59.95 |
| NQ | 75.3 | 47.6 | 75.7 |
| NQ3/NQTT | 75.3 | 45.1 | 75.7 |
| HQ | 95.6 | 63.5 | 96.09 |
| HQ3/HQTT | 95.6 | 61.1 | 96.09 |
| PQ | 122 | 85 | 122.65 |
| PQ3 | 122 | 83 | 122.65 |
Structure and Materials
1.Base: High-quality alloy steel forged, with high strength and resistance to deformation.
2.Felt body: High-maintenance tungsten carbide formula, with a temperature resistance of 1100℃, suitable for complex strata.
3.Diamond layer (optional):
* Surface Set with natural diamonds: Large-grain natural diamonds, fast drilling speed, suitable for soft - medium-hard rocks.
* Impregnated with diamonds: Fine-grained diamonds evenly distributed, long wear life, suitable for medium-hard - hard rocks.
* PCD/TC composite sealing: Polycrystalline diamond / tungsten carbide reinforced, resistant to abrasion, anti-diameter reduction.
* Water channel design: Spiral edges + guiding slopes, smooth water flow and good chip removal, reducing drilling resistance by 30%+.
Core Advantage
1. Precise wellbore stability: Maintains a stable φ75.3mm bore diameter, prevents shrinkage and sticking, ensuring sufficient gap for changing drill bits.
2. Strong steering: Reduces drill rig vibration, prevents hole deviation, and is suitable for unevenly inclined formations.
3. High wear resistance and long service life: Single section advance 3000 meters +, pure drilling time 250 hours +, stable performance in fractured formations.
4. Broad adaptability: Can be used efficiently in soft rock, moderately hard rock, hard rock, fractured formations, and soft-hard alternating layers.
5. Protecting drill tools: Shares radial wear, extends the service life of the outer pipe and drill bit, and reduces overall costs.
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