Non-Magnetic Drill Collar(NMDC)

DeRun Energy non-magnetic drill collars are made from non-magnetic materials with low-magnetic permeability.(P530,P550 etc) API monogram, serial number, OD, ID, type and size of connections are stamped on recessed mill flats. 

Mechanical Properties of Non-magnetic Drill Collar

Magnetic Properties of Non-magnetic Drill Collar:

When MPS=1 ×105/4πA/m:
Relative magnetic permeability μ r ≤ 1.1010
Magnetic Field Gradient △ B ≤ 0.05 μT