Graduation apparatus of magnetic nuclear resonance logger

Abstract

The invention discloses a calibration device for a nuclear magnetic resonance well logger, which comprises a circulation system, a shielding dial drum and a lithologic medium placing board, wherein the circulation system consists of a mixing vessel, a vacuum valve and a Faraday dial drum; the Faraday dial drum is provided with an instrument outer cylinder which is used for placing a detecting instrument and a corresponding probe; the shielding dial drum is sleeved outside the instrument outer cylinder and used for circulating flow of a calibration solution; the lithologic medium placing board is arranged inside the shielding dial drum and used for placing solid lithologic media; a skylight for placing and taking the solid lithologic media is also arranged on the shielding dial drum; and a skylight cover is arranged on the skylight. The calibration device for the nuclear magnetic resonance well logger not only effectively reduces the volume of the calibration device and shields interference of an external electromagnetic field but also can conveniently and flexibly replace the lithologic media, accurately calibrate the investigation depth and the sensitivity on the lithologic media with various porosities, and provide accurate scale data for the nuclear magnetic resonance well logger.

Description

technical field [0001] The invention relates to a calibration device of a nuclear magnetic resonance logging instrument. Background technique [0002] The calibration of the NMR logging tool is carried out in a special device, which is an ingeniously designed solution circulation device. The basic requirement is to be able to simulate the formation with 100% porosity, to better shield the radiation of radio frequency magnetic fields, and to be non-magnetic and not polarized by magnetic media. [0003] The conventional nuclear magnetic calibration device can obtain the working frequency of the radio frequency antenna, the magnetic field strength B0 corresponding to the maximum amplitude A0 signal, and the relationship between A0 and porosity through frequency sweep, main scale, and statistical inspection of the water tank. However, due to the lack of solidified lithological medium, the inability to accurately locate the position of the lithological medium, and the self-eleva...

AI Technical Summary

Problems solved by technology

However, due to the lack of solidified lithology medium, the inability to accurately locate the position of lithology medium, and the self-elevating structure, it is impossible to conveniently replace lithology medium and accurately calibrate the detection depth, and it is bulky and does not have self-elevating properties.

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