EN
NQ3 Reaming Shell Outer Diameter 75.5mm Core Reamer
NQ3 reaming tool is a small inner-diameter diamond reaming tool specifically designed for N specification wireline core drilling. It is commonly known as "narrow-core NQ". The outer diameter is exactly the same as that of the standard NQ, but the inner diameter is smaller and the core is finer. It is specially designed for fractured, loose, deep-hole and easily clogged core formations. When used in conjunction with the NQ3 dedicated inner tube and drill bit, it significantly improves the core retrieval success rate and drilling stability.
Compatible products: NQ3 rope core dual pipe, NQ drill pipe, NQ3 drill bit
English Name: NQ3 Reaming Shell / NQ3 Diamond Reamer / NWL3 Reamer
Material: Diamond
Outer diameter: 75.7 millimeters
Minimum order quantity: 1 piece
Description
NQ3 reaming tool is a small inner-diameter diamond reaming tool specifically designed for N specification wireline core drilling. It is commonly known as "narrow-core NQ". The outer diameter is exactly the same as that of the standard NQ, but the inner diameter is smaller and the core is finer. It is specially designed for fractured, loose, deep-hole and easily clogged core formations. When used in conjunction with the NQ3 dedicated inner tube and drill bit, it significantly improves the core retrieval success rate and drilling stability.
Compatible products: NQ3 rope core dual pipe, NQ drill pipe, NQ3 drill bit
English Name: NQ3 Reaming Shell / NQ3 Diamond Reamer / NWL3 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. High-strength Base: Made of high-quality alloy steel, it is resistant to torsion, vibration, and does not deform easily.
2. High-maintenance Tire Body: Carbon tungsten hard alloy formula, with a temperature resistance of 1100℃, suitable for strong grinding strata.
3. Diamond Working Layer (Optional):
* Surface-set natural diamond: Soft - medium-hard rock, fast advancement, smooth chip removal.
* Inset diamond: Medium-hard - hard rock, suitable for fractured strata, long lifespan, good stability.
* PCD Composite Sheet: Deep holes, strong grinding strata, resistant to impact, extremely wear-resistant.
* Three support blocks + Spiral Water Channel: 3 main support blocks + spiral chip removal channel, smooth water flow, reduces resistance by 30%+, reduces the risk of core blockage and core jamming.
Core Advantages
1. Less Likely to Get Stuck: The 41mm fine core is less prone to blockage. The core extraction rate in fractured/loose formations can be increased by 20% - 40%.
2. More Stable Deep Wells: The inner pipe is lighter and more rigid, resulting in less vibration and less deviation in deep wells with a depth of ≤ 2000m.
3. Precise Core Diameter Maintenance: The core diameter is stably maintained at 75.3mm, preventing core shrinkage and sticking, and providing sufficient space for changing drill bits.
4. Strong Centering and Anti-Slip: The three pad block design reduces the swinging of the drill string and is suitable for easily deviating formations.
5. Long Service Life and Low Cost: Each unit can achieve a drilling depth of 2500 - 3000 meters. It performs better than the standard NQ in fractured formations.
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