Non-magnetic Drill Collar

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Non-magnetic Drill collars are made from Non-magnetic drill collar materials with low- strength (SWNM20-14) by combining a proprietary chemical analysis and a rotary hammer forging process with low magnetic permeability excellent machine ability. The material is resistant to stress corrosion cracking, with high machine ability and no tendency to galling. Each drill collar is fully inspected by internal inspection dept. Strict to control of chemical composition and special forging process guarantee the excellent mechanical properties of SENWELL’S non-magnetic tools.

Non magnetic Properties:

Relative Permeability: Max1.005

Hot spot/Field Gradient△ B: Max ± 0.05μT

When MPS=1 ×105/4πA/m:

Special Treatment on ID: Roller Burnishing (After roller burnishing, a compressive layer come into being)

Advantage:

3. μm

Inspection& test items for each Non-magnetic drill collar, non-magnetic stabilizer etc.

Chemical composition, Tensile Test, Impact Test, Hardness Test, Metallographic Test (Grain Size), Corrosion Test (according to ASTM A262 Practice E), Ultrasonic Test over the whole length of the bar (according to ASTM A388), Relative Magnetic Permeability Test, Hot Spot Test, Dimension Test etc.

Drill collars are available in lengths from 10 to 31 feet and outside diameter from 3 1/8” to 11".

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