A kind of manufacturing method of relative magnetic permeability standard steel of non-magnetic drill collar

Abstract

The invention relates to a method for manufacturing non-magnetic drill collar relative permeability standard steel. The method for manufacturing the non-magnetic drill collar relative permeability standard steel comprises the following steps that firstly, a non-magnetic drill collar relative permeability value range (0-1.010) is determined, a sample is selected from steel for non-magnetic drill collar; the selected sample is smelted and cast by using induction heating and centrifugal casting equipment to manufacture a solid round rod blank, wherein the chemical composition of the round rod blank is basically the same as that of the nonmagnetic drill collar, and the composition is uniform; machining and fine grinding are carried out to obtain solid round rod standard steel with phi(10+ / -0.1)mmx(30+ / -5)mm, and Ra<=0.8; and relative permeability uniformity test and stability evaluation are carried out on the solid round rod standard steel, and the base value of the standard steel is determined. The non-magnetic drill collar relative permeability standard steel has uniform relative permeability setting value, good stability and can be stored for a long time. As the material is drawn from a steel body for the non-magnetic drill collar, the relative permeability data can better ensure the calibration of a testing instrument. The non-magnetic drill collar relative permeability standard steel ensures the calibration requirements of the testing instrument and improves the measurement accuracy of the non-magnetic drill collar relative permeability.

Description

Technical field [0001] The invention belongs to the technical field of magnetic performance testing of non-magnetic drill collars, and particularly relates to a method for manufacturing non-magnetic drill collars with relative permeability standard steel. Background technique [0002] Before using the non-magnetic drill collar relative permeability tester, the relative permeability standard sample is required to calibrate the instrument, and the standard sample equipped with the instrument is mostly made of copper, and the standard sample value is only a single-point value (such as relative magnetic The fixed value of conductivity standard sample is 1.020), "SY / T 5144-2007 People's Republic of China Petroleum and Natural Gas Industry Standard-Drill Collar Standard" 6.4. Clause stipulates: non-magnetic drill collar overall relative permeability <1.010; relative permeability After single-point calibration using such relative permeability standard samples, the measurement accurac...

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Problems solved by technology

[0002] Before using the non-magnetic drill collar relative permeability testing instrument, it is necessary to calibrate the instrument with a relative permeability standard sample, and the standard sample equipped with the instrument is mostly made of copper, and the standard sample value is only a single point value (such as relative magnetic permeability The fixed value of conductivity standard sample is: 1.020), "SY / T 5144-2007 People's Republic of China Petroleum and Natural Gas Industry Standards - Drill Collar Standard" 6.4. Clause stipulates: the overall relative magnetic permeability of non-magnetic drill collars < 1.010; relative magnetic permeability The accuracy of the measurement cannot be guaranteed after the single-point calibration of the relative permeability test instrument is carried out.

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