Non-magnetic drill collars

Are intended to create a thrust load on bore bit, increase rigidity and stability of the drill string bottom while drilling the directional and horizontal wells and exclude ferromagnetism impact during the use of telemetry tools.

While working in oil and gas fields, special attention is paid to non-magnetic steels. The stable austenite microstructure of these steels is provided by a high content of chrome, manganese and nitrogen, as well as a small amount of nickel.

These steels are produced only as heat-treated, and they are resistant to both pitting corrosion and to stress corrosion cracking.

Relative permeability does not exceed 1.01 μT. Magnetic field gradient is max. 0.05 μT.

Design types:

• bare without grooves;
• with elevator grooves;
• with elevator grooves and power slips;
• bare with riffling (flats);
• with elevator grooves and riffling (flats);
• with elevator and power slips grooves; with riffling (flats).

Non-magnetic drill collars sizes