The company "Scholler-Blackmann Darron Russia" takes a leading position in Europe and Asia in the market of sales of non-magnetic drill collars (NMDC) with high non-magnetic and mechanical properties that provide resistance to various types of corrosion. We supply non-magnetic steels and pipes produced by our sister company Schoeller-Bleckmann Oilfield Technology, which is part of our international holding company Schoeller-Bleckmann Oilfield Equipment.
List of supplied steel grades, classified by pitting resistance level, strength characteristics and application in drilling.
We also manufacture high-strength non-magnetic steel downhole drilling equipment using both our own raw materials and those of the customer:
- NMDC , pony Collars
- Non-magnetic subs, positioning subs, circulation subs, body elements of MWD / LWD systems
- Non-magnetic calibrators
Relative magnetic permeability:
steel Р530 ≤ 1.001,
steel Р550 ≤ 1.005
Magnetic field gradient (corrosive area) ≤ 0.5 micro Tesla (μT)
One of the important advantages of our NMDC is the hardening treatment of the inner diameter "Hammer Peening", which makes the inner surface more resistant to stress corrosion cracking inside the grains. Due to the processing, an inner layer appears with a level of compressive stresses along the circumference and axis, which allows for a longer time to resist stress corrosion cracking.