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Working principle of non-magnetic drill collars

release time：2023-12-15

source： network

① Geomagnetic field lines; ② Magnetic measuring instrument; ③ Steel drill collars;

④ Interference with magnetic field lines; ⑤ Drill bit joint; ⑥ Non-magnetic drill collar

The interference magnetic field lines above and below the non-magnetic drill collar have no effect on the measuring instrument, so the non-magnetic drill collar creates a non-magnetic environment for the magnetic measuring instrument, ensuring that the data measured by the magnetic measuring instrument is true geomagnetic field information.

At present, non-magnetic drill collars are often used in the drilling process of oil, natural gas, and coalbed methane. This material has extremely low magnetic permeability, good mechanical properties, and corrosion resistance. Its purpose is to provide a measurement environment for logging instruments that is not affected by the magnetic field of the drill string.

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