Luhai non-magnetic drill collars are made from non-magnetic materials with low-magnetic permeability. API monogram, serial number, OD,ID, type and size of connections are stamped on recessed mill flats.

Magnetic Properties of Non-magnetic Drill Collar

When MPS=1×105/4πA/m

Relative magnetic permeabilityμr≤1.1010

Magnetic Field Gradient△B≤0.05μT