NQ wireline coring is the global industry standard for core sampling in mineral exploration, geotechnical engineering and geological survey projects. It uses a specialized double-tube drill string that allows operators to retrieve core samples without lifting the entire drill pipe from the borehole. This method reduces tripping time by up to 70%, improves core recovery rates to over 95%, and minimizes the risk of borehole collapse. An NQ core sample drill rig is purpose-built to maximize the efficiency and accuracy of this coring method, delivering consistent performance even in complex geological formations. Traditional core drilling rigs often struggle with unstable torque control and slow tripping speeds, leading to broken core samples and costly project delays.
YG manufactures a full line of high-performance rigs designed for NQ coring. Our YGX series includes four models: YGX-400, YGX-600, YGX-800 and YGX-1000, covering drilling depths from 180m to 1100m.
NQ Core Sample Drill Rig Parameter:
| Model | YGX-400 | YGX-600 | YGX-800 | YGX-1000 |
| Drilling Depth(M) | 180-400-500 | 200-600-650 | 400-800-1000 | 500-1000-1100 |
| Rated pressure(MPA) | 21 | 21 | 25 | 28 |
| Rated Flow(L/min) | 168 | 192 | 260 | 300 |
| Heat Dissipation Mode | Air cooling+water cooling | |||
| Engine Brand | Yuchai | Yuchai | Yuchai | Cummins |
| Rated power/speed | 78kW/ 2400r/min | 92kW/ 2400r/min | 92kW/ 2400r/min | 154kW/2400r/min |
| Drilling Angle(°) | 0-90 | 45-90 | 45-90 | 45-90 |
| Lifting Force(T) | 12 | 16 | 24 | 30 |
| Feed Force(T) | 6 | 8 | 12 | 15 |
| Hydraulic Mud pump flow | 30-90（L/min） | 30-90（L/min） | 90-180（L/min） | 90-180（L/min） |
| Hydraulic Mud pump power | 4-7(MPA) | 4-7(MPA) | 4-7(MPA) | 4-7(MPA) |
| Dimension | 4000*1900*1800mm | 4000*2000*1800mm | 5500*2100*2000mm | 6000*2200*2400mm |
| Weight | 4.3T | 4.5/5.5T | 6.5T | 7.5T |
Common Wireline Coring Tool Specifications
| Specification | Drill Bit Outer Diameter（mm） | Core Diameter（mm) | Reamer Outer Diameter | Drill Pipe Outer Diameter |
| BTW | 60 | 42 | 60 | 56.3 |
| NTW | 75 | 56 | 75.8 | 75.3 |
| HTW | 95 | 71 | 96 | 91.5 |
| BQ | 59 | 36.4 | 60 | 55.6 |
| NQ | 75.7 | 47.6 | 75.8 | 69.9 |
| HQ | 96 | 63.6 | 96 | 88.9 |
If you would like to learn more about drilling and coring methods, please click here: Core Drilling Rig: Drilling and Coring Methods Guide
Why Does NQ Wireline Coring Outperform Traditional Drilling Methods?
For decades, exploration teams relied on conventional core drilling that required lifting the entire drill string every time a core sample was needed. This process was slow, labor-intensive and often resulted in damaged or incomplete core samples that compromised geological analysis.
An NQ core sample drill rig is purpose-built to take full advantage of this efficient coring method. The wireline system uses a winch to retrieve the inner core tube directly through the drill pipe, eliminating the need for repeated tripping operations. This delivers three transformative benefits:
- 30-50% faster project completion: Teams can drill more meters per day without sacrificing core quality
- Superior data accuracy: Intact core samples provide reliable information about mineral deposits and geological structures
- Lower operational costs: Fewer tripping cycles reduce wear on drill pipes and cut labor requirements by 40%
Core Recovery Optimization: Matching Rig Parameters To Coring Specifications
Achieving consistent 95%+ core recovery requires more than just high-quality drill rods and core barrels. You must also match your rig’s operating parameters to the specific coring size and formation type. Our hydraulic core drilling machines are engineered with the flexibility to adapt to all standard wireline coring specifications.
Our hydraulic core drilling machine features fully adjustable mud pump flow and pressure settings, allowing you to fine-tune performance for each coring size:
- For BQ coring: Use 30-60L/min mud flow and 18-21MPa pressure to prevent core washing
- For NQ coring: The optimal range is 60-120L/min flow and 21-25MPa pressure, which balances cuttings removal and core integrity
- For HQ coring: Increase flow to 90-180L/min and pressure to 23-28MPa to handle the larger borehole volume
How To Maximize Core Recovery Rates In Challenging Formations?
Even the best core drilling equipment will produce poor results without proper operation. These field-proven best practices will help you consistently achieve core recovery rates above 95% with your rig:
- Match parameters to formation type: Use lower pressure and higher speed for soft rock, and higher pressure and lower speed for hard, abrasive formations
- Maintain optimal flushing flow: The hydraulic mud pump on our rigs provides adjustable flow from 30-180L/min to remove cuttings effectively without washing out core samples
- Inspect core barrels daily: Replace worn components to ensure proper alignment and prevent core damage during retrieval
- Use high-quality NQ drill rods: Straight, undamaged drill rods minimize vibration and ensure smooth operation of the wireline system
- By following these guidelines, you can reduce core breakage and ensure that your geological data is accurate and reliable.
Core Drilling Machine Price- Factory Direct Price
An NQ core sample drill rig is an essential investment for any exploration or geotechnical company looking to improve efficiency and data quality. YG’s rigs are built with high-quality components to deliver reliable performance in the toughest field conditions.
If you are looking for durable, high-performance core drilling equipment that will meet your project requirements, contact us today. Our technical team will evaluate your needs and provide a transparent core drilling machine price with no hidden costs. Invest in a professional NQ core sample drill rig and take your exploration projects to the next level.
