Non-Magnetic Drill Collar: Guaranteeing Precision in Wellbore Surveying
The Critical Challenge of Magnetic Interference
In directional drilling, standard steel components distort essential survey data, leading to:
-Inaccurate Azimuth Readings: Deviations exceeding 3° in high-latitude wells.
-Increased Collision Risks: Unreliable data raises the potential for wellbore collisions.
-Costly Corrective Actions: Requires additional runs and trajectory corrections, resulting in non-productive time.
Our Non-Magnetic Drill Collar delivers:
✅ Ultra-Low Magnetic Permeability (<1.005 μ) for survey-grade accuracy.
✅ Unmatched Trajectory Control, enabling precise well placement.
✅ Full Compliance with API and SY/T5144 standards.
Engineered for Uncompromising Accuracy
Advanced Material Science
| Property | Conventional NM Collar | Our Innovation |
| Magnetic Permeability | 1.05 – 1.10 μ | ≤ 1.005 μ |
| Core Material | Standard Austenitic Stainless Steel | Proprietary Low-Carbon Stainless Steel |
| Corrosion Resistance | Moderate (PREN 28-32) | High (PREN 38-42) |
→ Proprietary Low-Carbon Stainless Steel eliminates magnetic hotspots.
→ Controlled Forging & Heat Treatment ensures uniform non-magnetic properties throughout the collar.
Technical Specifications
| Parameter | Specification |
| Size Range | 3-1/2″ to 9-1/2″ OD |
| Standard Length | 9.1m / 30ft (Custom lengths available) |
| Thread Connections | API NC31 to NC77, 4-1/2″ FH to 7-5/8″ FH |
| Special Threads | Double-Shoulder, VAM, TMK, and other premium connections |
| Pressure Rating | 15,000 psi Internal / 10,000 psi External |
| Compliance | API Spec 7-1, SY/T5144, ISO 10407-2 |
Manufacturing Excellence & Durability
✅ Cold Rolled Thread
40% Longer Fatigue Life compared to cut threads.
Automated Thread Inspection on every collar ensures perfect geometry.
✅ Double-Shoulder Connection Option
200% Higher Torsional Strength than API connections.
Superior Gas-Tight Seal for high-pressure applications.
✅ Robust Construction
Full-Body Hardbanding (Optional) reduces casing wear by up to 70%.
H₂S Service options available with NACE MR0175 compliant materials.
Field-Proven Performance & Applications
Deepwater & HPHT Wells: Maintains integrity and accuracy at 175°C+.
Sour Gas Fields: NACE MR0175 compliant materials resist sulfide stress cracking.
Arctic Drilling: Reliable performance in extreme low-temperature environments.
Complex Wellpaths: Essential for ERD, horizontal, and multi-lateral wells requiring precise geomagnetic referencing.
