Non-Magnetic Heavy Weight Drill Pipe: Precision Weighting with Survey-Grade Accuracy
The Magnetic Interference Challenge in Directional Drilling
Standard drill pipes create magnetic distortion that causes:
-Azimuth errors up to 3° in high-latitude wells
-Well collision risks from inaccurate trajectory data
-Costly correction runs requiring additional rig days
Our non-magnetic HWDP delivers:
✅ Ultra-low magnetic permeability (≤1.005 μ)
✅ Seamless MWD/LWD integration for precise well placement
✅ API + SY/T5144 dual certification
Advanced Material Engineering
Proprietary Alloy Technology
| Property | Standard HWDP | Our NM-HWDP |
| Magnetic Permeability | 1.05-1.10 μ | ≤1.005 μ |
| Yield Strength | 120-135 ksi | 155 ksi minimum |
| Corrosion Resistance | PREN 28-32 | PREN 38-42 |
→ Low-carbon stainless steel forged in controlled atmosphere
→ Full-length heat treatment for uniform magnetic properties
Technical Specifications
| Parameter | Specification |
| Size Range | 3-1/2″ to 6-5/8″ OD |
| Joint Length | 9.5m/31ft (custom 8-12m available) |
| Tool Joint | API NC31-NC50, 4-1/2″ FH-6-5/8″ FH |
| Premium Threads | Double-shoulder, VAM, TMK |
| Pressure Rating | 15,000 psi internal / 10,000 psi external |
| Compliance | API Spec 7-1, SY/T5144, ISO 10407-2 |
Manufacturing Excellence
✅ Cold Rolled Threads
40% longer fatigue life vs. cut threads
Automated thread inspection on every joint
✅ Double-Shoulder Connection Option
200% higher torsional strength
Leak-proof seal to 15,000 psi
✅ Enhanced Durability
Full-body hardbanding (tungsten carbide matrix)
Casing wear reduction ≥70%
Operational Benefits
-For MWD/LWD Systems
Guarantee <0.5° azimuth error in 3D well paths
Enable 1.5m collision avoidance separation
Support magnetic ranging for SAGD well pairs
-For Drilling Engineers
Eliminate dedicated NMDC strings – use NM-HWDP for weighting and surveying
Reduce survey uncertainty by 4x
Achieve GPS-level accuracy at 10,000ft TVD
Field Performance Data
North Sea HPHT Wells: Zero magnetic interference at 185°C
Arctic Drilling: Azimuth accuracy ±0.1° at 85° inclination
Ultra-Deepwater: 12,000+ hours without degradation
Sour Gas Applications: NACE MR0175 compliant for H₂S service
