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Non magnetic drill collar action
release time：2023-12-08
source： network
Non magnetic drill collars are made of a low-carbon, high chromium manganese alloy steel. They are refined through strict chemical composition ratios and forged to achieve their mechanical properties. They have good low magnetic permeability, high strength mechanical properties, excellent intergranular corrosion cracking resistance, and excellent wear resistance. When the magnetic field strength is 1 × 105/4 Π At A/m, the relative magnetic permeability of the non-magnetic drill collar µ r ≤ 1.010.
The magnetic field intensity gradient of the non-magnetic drill collar along the inner hole at any distance of 100mm is ≤ 0.05 µ T.
Due to the fact that all magnetic measuring instruments induce the geomagnetic field of the wellbore when measuring its direction, the measuring instrument must be in a non-magnetic environment. However, during the drilling process, drilling tools often have magnetism, which affects magnetic measurement instruments and cannot obtain accurate wellbore trajectory measurement information data. Non magnetic drill collars can be used to implement a non-magnetic environment and have the characteristics of drill collars during drilling. A considerable number of non-magnetic drill collar products have been included in the APL standard abroad since 1990.
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