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
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