Rock Drilling Tools
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- Pipe diameter: 3"-7"
- Length: 1-12m
- Joint material: 42CrMo alloy steel
- Pipe body material: R780 steel
- Welding method: Friction welding
- Thread types: API-standard drill pipe threads available; custom thread designs upon request
Typical Applications
Open-pit mining
Well drilling
Slope stabilization and support
Technical Specifications
| D | h | C | C1 | d | k | L |
| Outer diameter | Wall thickness | Thread connection | Inner bore | Wrench flat | Length | |
| 73mm(3'') | 6.5mm | API 2 3/8'' REG | 32mm | 157mm | 45mm | 1000mm-9000mm |
| 8.5mm | API 2 3/8'' REG | 32mm | 157mm | 45mm | 1000mm-9000mm | |
| 89mm(3 1/2'') | 6.5mm | API 2 3/8'' REG | 32mm | 70mm | 45mm | 1000mm-9000mm |
| 8.5mm | API 2 3/8'' REG | 32mm | 57mm | 45mm | 1000mm-9000mm | |
| 6.5mm | NC26 | 40mm | 70mm | 45mm | 1000mm-9000mm | |
| 8.5mm | NC26 | 40mm | 70mm | 45mm | 1000mm-9000mm | |
| 102mm(4'') | 6.5mm | API 3 1/2'' REG | 45mm | 83mm | 51mm | 1000mm-9000mm |
| 8.5mm | API 3 1/2'' REG | 45mm | 83mm | 51mm | 1000mm-9000mm | |
| 6.5mm | NC31 | 45mm | 83mm | 51mm | 1000mm-9000mm | |
| 8.5mm | NC31 | 45mm | 83mm | 51mm | 1000mm-9000mm | |
| 114mm(4 1/2'') | 6.5mm | API 3 1/2'' REG | 45mm | 95mm | 51mm | 1000mm-9000mm |
| 8.5mm | API 3 1/2'' REG | 45mm | 95mm | 51mm | 1000mm-9000mm | |
| 6.5mm | NC38 | 60mm | 95mm | 51mm | 1000mm-9000mm | |
| 8.5mm | NC38 | 60mm | 95mm | 51mm | 1000mm-9000mm | |
| 127mm(5'') | 8.5mm | API 3 1/2'' REG | 45mm | 108mm | 51mm | 1000mm-9000mm |
| 8.5mm | NC38 | 60mm | 108mm | 51mm | 1000mm-9000mm | |
| 133mm(5 1/4'') | 10mm | API 3 1/2'' REG | 45mm | 114mm | 51mm | 1000mm-9000mm |
| 146mm(5 3/4'') | 10mm | API 4 1/2'' REG | 60mm | 127mm | 55mm | 1000mm-9000mm |
| 168mm(6 5/8'') | 10mm | NC50 | 60mm | 149mm | 55mm | 1000mm-9000mm |
| 178mm(7'') | 10mm | API 4 1/2'' REG | 60mm | 159mm | 55mm | 1000mm-9000mm |
Performance and Configuration
- Pipe body: The pipe body is manufactured from high-quality R780 seamless steel, designed for drilling operations in complex and demanding geological conditions. It provides a balanced combination of strength, fatigue resistance, and stability during drilling.
- Tool joints: The tool joints are made from 42CrMo high-strength alloy steel, offering excellent strength, toughness, and hardenability. This material is widely used in demanding applications such as drilling tool joints, fishing tools, and heavy-duty forming dies, and is suitable for deep drilling applications up to 2000m.
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What materials are used for the DTH drill pipes?
The standard material configuration for our DTH drill pipes is as follows:
- Tool joints: 42CrMo alloy steel
- Pipe body: R780 steel
Other material combinations can be customized based on specific application requirements.
How should drill pipe length be selected?
Drill pipe length is typically selected according to the drilling rig specifications and operating conditions. Common standard lengths include 1.5m, 3m, and 6m. Custom lengths can also be manufactured upon request.
How should DTH drill pipes be maintained?
To extend service life and maintain reliable performance, we recommend the following maintenance practices:
- Apply an appropriate amount of thread grease to the joints before each use
- Clean the drill pipes after operation to remove mud and debris
- Inspect drill pipes regularly and promptly repair or replace damaged or deformed components
- Store drill pipes away from heavy loads and high-humidity environments to prevent deformation and corrosion