Wireline drill pipe
English Technical Summary
1. Product Definition
The Wireline Drill Pipe is a specialized coring pipe with a dual-tube design:
- •
Outer Tube: API-grade alloy steel (e.g., S135) transmits torque and withstands formation pressure.
- •
Inner Tube: Retrievable via wireline cable for core extraction without tripping
2. Key Specifications
- •
Models: BQ (≤1,000m), NQ (1,000–2,500m), HQ (2,500–3,500m), PQ (>3,500m).
- •
Material: Quenched & tempered steel (yield strength ≥655 MPa)
- •
Connections: API REG/IF threads for pressure sealing
3. Critical Applications
- •
Mineral Exploration:
- •
NQ/HQ models extract undisturbed cores in gold/copper mines (1,500–3,000m depth)
- •
- •
Oil & Gas:
- •
HQ/PQ cores in shale gas wells optimize fracturing design
- •
- •
Geothermal:
- •
HQ withstands 350°C for brine reservoir analysis (Indonesia projects)
- •
4. Operational Advantages
- •
Efficiency: 70% time savings vs. conventional drilling
- •
Core Integrity: >95% preservation rate with inner tube protection
