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BQ Diamond Reaming Shell OD 59.8mm for Wireline core drilling
BQ Reaming Shell (or BQ reamer) is the most commonly used small-diameter diamond reaming tool in geological wireline coring drilling, and it is one of the Q series standard drilling tools. It is installed between the outer tube of the core tube and the diamond drill bit, reducing the wear of the outer tube and sharing the radial wear with the drill bit.
Compatible products: BQ drill pipe, BQ drill bit
Material: Diamond
Outer diameter: 59.8mm
Inner diameter: 36.4mm
MOQ:1PCS
Description
BQ Reaming Shell tool is the most commonly used fine-diameter diamond reaming tool in downhole coring drilling in geological wells. It is also a small-diameter standard diamond reaming tool of the Q series for rope-lift core drilling. It is installed between the BQ drill bit and the outer core tube, and its main functions are to maintain the diameter, align the core, and protect the pipe. It is specifically designed for shallow-to-medium deep holes (≤1200m), soft-to-medium hard strata, and small-diameter core extraction scenarios. It is a basic supporting tool for geological exploration, mineral exploration, and hydrological and water well surveys.
Compatible products: BQ drill pipe, BQ drill bit, BQ core barrel
Material: Diamond
Outer diameter: 59.8mm
MOQ:1PCS
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 Matrix: High-quality alloy steel forged (such as 30CrMnSiA), resistant to torsion, vibration, and deformation.
2. High-maintenance Tire: Carbon tungsten hard alloy formula, with a temperature resistance of 1100°C, suitable for soft - medium-hard and slightly abrasive formations.
3. Diamond Working Layer (Optional):
* Surface-set natural diamond: Soft - medium-hard rocks, fast advancement, smooth chip removal, low cost.
* Inset diamond: Medium-hard rocks, fractured formations, long wear life, good stability.
* PCD/TC Composite Retaining: Enhances retaining ability, suitable for easily constricted formations.
* Spiral Water Channel Design: 3–4 spiral edges + guiding slope, smooth water flow, fast chip removal, reduces drilling resistance by 25%+.
Core Advantages
1. Small-diameter Precise Retaining: Stably maintains a φ60mm bore diameter, prevents constrictions and stuck drill bits, with sufficient gap for drill bit replacement.
2. Strong Stabilization and Anti-Slip: Reduces drill rig vibration and oscillation, suitable for shallow to medium-deep holes with easily deviated formations.
3. Efficient Core Extraction: φ36mm standard core, high complete formation core extraction rate, low core-blocking risk.
4. Long Service Life and Low Cost: Single unit advance 2000–2500 meters, stable performance in soft - medium-hard formations, high cost-effectiveness.
5. Protecting Drill Rig: Shares radial wear, extends the lifespan of the outer pipe and drill bit, reduces overall drilling costs.
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