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Non magnetic drill collars function and working principle

2014-01-06 16:04:30

Non magnetic drill collars are made of a kind of low carbon high chromium manganese alloyed steel. It passes through the ratio of chemical composition of strict after refining and achieve its mechanical properties after forging. Non magnetic drill collars have good low permeability, high strength and mechanical properties, excellent resistance to intergranular corrosion cracking resistance and excellent wear resistance.
Since all of the magnetic measuring instruments measuring the direction of the borehole, earth's magnetic field is induced in the wellbore, thereby measuring instrument must be a non-magnetic environment. However, during drilling, drill string often have magnetic field having influence of the magnetic measuring instruments can not be correctly measured trajectory information data using non magnetic drill collars may be implemented non-magnetic environment, and have the characteristics of drilling collar.
Non magnetic drill collars and down the magnetic field lines have no effect on interference measuring instrument parts. Therefore, non magnetic drill collars to create a magnetic measuring instruments, non-magnetic environment, to ensure that the magnetic measuring instruments measured data for the real earth magnetic field information.


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