Non-Magnetic Drill Collars & subs
Non-Magnetic Drill Collar
Slick Non-Mag Drill Collar
Slick Non-Mag Drill Collar provide the required weight on bit, and will not interfere with the directional drilling ability.
Spiral Non-Mag Drill Collar
Spiral Non-Mag Drill Collar is designed to allow greater flow area for drilling fluids, while providing the benefits of non-mag steel for complex drilling programs.
Flex Non-Mag Drill Collar
Flex Non-Mag Drill Collar is thinner and more flexible than standard drill collar. Their ability to make short radius turns, bend for high build angles, and pass through severe doglegs makes them ideal for use in directional and horizontal applications. Manufactured with non-mag steel, this drill collar is well suited for housing MWD equipment.
Product Specification
| Connections | OD mm |
ID mm |
Length mm |
| NC23-31 | 79.4 | 31.8 | 9150 |
| NC26-35 | 88.9 | 38.1 | 9150 |
| NC31-41 | 104.8 | 50.8 | 9150 or 9450 |
| NC35-47 | 120.7 | 50.8 | 915 or 9450 |
| NC38-50 | 127.0 | 57.2 | 9150 or 9450 |
| NC44-60 | 152.4 | 57.2 | 9150 or 9450 |
| NC44-60 | 152.4 | 71.4 | 9150 or 9450 |
| NC44-62 | 158.8 | 57.2 | 9150 or 9450 |
| NC46-62 | 158.8 | 71.4 | 9150 or 9450 |
| NC46-65 | 165.1 | 57.2 | 9150 or 9450 |
| NC46-65 | 165.1 | 71.4 | 9150 or 9450 |
| NC46-67 | 171.4 | 57.2 | 9150 or 9450 |
| NC50-67 | 171.4 | 71.4 | 9150 or 9450 |
| NC50-70 | 177.8 | 57.2 | 9150 or 9450 |
| NC50-70 | 177.8 | 71.4 | 9150 or 9450 |
| NC50-72 | 184.2 | 71.4 | 9150 or 9450 |
| NC56-77 | 196.8 | 71.4 | 9150 or 9450 |
| NC56-80 | 203.2 | 71.4 | 9150 or 9450 |
| 6 5/8REG | 209.6 | 71.4 | 9150 or 9450 |
| NC61-90 | 228.6 | 71.4 | 9150 or 9450 |
| 7 5/8REG | 241.3 | 76.2 | 9150 or 9450 |
| NC70-97 | 247.6 | 76.2 | 9150 or 9450 |
| NC70-100 | 254.0 | 76.2 | 9150 or 9450 |
| 8 5/8REG | 279.4 | 76.2 | 9150 or 9450 |
Non Magnetic Stabilizer
Integral non magnetic stabilizer is made from one solid forging of non magnetic steel. The material is high purity Chromium Manganese Austenitic stainless steel.
Ultrasonic inspection and MPI inspections are performed on each forging over its full length and section, after rough machining according to API Spec 71. Mill test certificates including mechanical properties, chemical analysis, magnetic properties and inspections are supplied with all stabilizers.
We have the capacity to produce Non Magnetic Stabilizer up to Crown OD 26”
Product Specification
| Tensile Strength | Yield Strength | Hardness | Magnetic Permeability | |
| min. | min. | min. | MAX | Average |
| 120KSI | 100KSI | 285HB | 1.01 | 1005 |
Non Magnetic MWD Sub
Non Magnetic MWD Sub is made from Chromium Manganese Austenitic stainless steel, compressive stress resistance pipe is made from non materials for installing MWD impulser inside and amongst others. Non Magnetic MWD Sub have been widely used by domestic and international directional drilling companies.
All connections are machined according to API Spec.7-2 and thread roots are cold worked and coated with API thread compound and equipped with protectors.
Product Specification
| Diameter (mm) |
Internal Diameter (mm) |
Internal bore length (mm) |
Lower-end aperture (mm) |
Total leagth (mm) |
| 121 | 88.2 | 1590 | 65 | 2500 |
| 172 | 111.5 | 1316 | 83 | 2073 |
| 175 | 127.4 | 1280 | 76 | 1690 |
| 203 | 127 | 1406 | 83 | 2048 |
Non Magnetic Materials standard
Non Magnetic Properties:
Relative Permeability: Max 1.005
Hot Spot / Field Gradient: MAX ±0.05μT
Special Treatment on ID: Roller Burnishing
After roller burnishing, a compressive layer come into being, the advantages as follows:
Increase the corrosion resistance properties, Increase the surface hardness of bore up to HB400, Increase surface finish of bore to Ra≤3.2 μm, Test and Inspection carried out on each bar during production of NMDC, Stabilizer and MWD parts.
Chemical Composition, Tensile Test, Impact Test, Hardness Test, Metallographic Test (Grain Size), Corrosion Test (According to ASTM A 262 Practice E), Ultrasonic Test over the whole length of the bar (According to ASTM A 388), Relative maganetic permeability Test, Hot spot Test, Dimensional Inspection, etc.
Special surface treatments options: Hammer peening, roller burnishing, shot peening.
