Hot-Pressed Double Tube Core Bit

The Hot-Pressed Double Tube Core Bit is engineered for high-precision core drilling in complex and abrasive formations. By combining hot-press diamond technology with a double tube structure, this bit ensures excellent core recovery, reduced disturbance, and stable drilling performance. It is widely used in mineral exploration, geotechnical investigation, and deep-hole drilling where core quality is critical.

The Hot-Pressed Double Tube Core Bit is designed for drilling environments where conventional single-tube or surface-set bits struggle to maintain core integrity.
By utilizing a double tube system, the inner tube remains isolated from flushing fluids while the outer tube performs cutting and rotation. Combined with a hot-pressed diamond matrix, this design significantly improves core recovery, reduces sample disturbance, and enhances bit lifespan in difficult formations.
This type of core bit is especially suitable for:
Broken or fractured rock
Abrasive formations
Unstable strata
Deep exploration drilling

Double Tube Structure
Inner tube protects the core from erosion
Outer tube handles cutting and torque
Greatly improves core recovery rate
 

Hot-Pressed Diamond Matrix
Strong diamond bonding
Uniform wear during drilling
Longer service life compared with surface-set bits
 

High Stability in Difficult Formations
Reduces core loss in fractured zones
Minimizes vibration and hole deviation
Maintains smooth drilling operation
 

Wide Compatibility
Suitable for BQ / NQ / HQ / PQ wireline systems
Can be matched with different matrix hardness levels

Suitable formations:
Fractured rock zones
Gravel and conglomerate layers
Karst limestone
Hard and abrasive formations
Backfill and mixed strata

 

Typical applications:
Mineral exploration drilling
Geological core sampling
Hydropower and dam foundation investigation
Engineering geology projects
Deep wireline core drilling

Our Hot-Pressed Double Tube Core Bits are manufactured under strict quality standards:

High-grade synthetic diamond selection

Controlled hot-press sintering process

Precision CNC machining

Strict concentricity and balance inspection

Multiple-stage quality checks before delivery

Each bit is tested to ensure:

Stable cutting performance

Strong diamond retention

Consistent service life

Project: Gold Exploration Project – Northern Tanzania

Geological Conditions:
Highly fractured granite
Gravel interlayers
Strong abrasiveness

 

Problems Before:
Frequent core loss
Low recovery rate
High bit consumption
Unstable drilling speed

The client switched to our Hot-Pressed Double Tube Core Bit (HQ size).
Results:
Core recovery increased by 40%+
Drilling stability significantly improved
Bit service life extended by 30–35%
Reduced re-drilling and downtime

Select matrix hardness based on formation abrasiveness
Maintain stable WOB and rotation speed
Ensure sufficient flushing flow
Avoid dry drilling conditions
Regularly inspect inner tube condition
Proper operation significantly extends bit life and improves drilling results.