Portable nuclear magnetic resonance analysis sensor and portable magnetic resonance analyzer

Abstract

The invention provides a portable nuclear magnetic resonance analysis sensor. The sensor comprises an outer magnetic ring, an inner magnetic ring and an adjusting magnet assembly, wherein the outer magnetic ring comprises a first magic ring formed by multiple first magnets, and the magnetizing direction of the multiple first magnets changes gradually in the first circumferential direction; the inner magnetic ring is located on the inner side of the outer magnetic ring and comprises a second magic ring defined by multiple second magnets, the magnetizing direction of the multiple second magnetschanges gradually in the first circumferential direction, and the axial height of each second magnet is smaller than that of each first magnet; the adjusting magnet assembly is distributed on the inner side of the outer magnetic ring or the inner magnetic ring and comprises a third magic ring formed by at least two third magnets, and the magnetizing direction of the at least two third magnets changes gradually in the second circumferential direction. The invention also provides a portable nuclear magnetic resonance analyzer. The size of a sensitive area of detection is increased and the signal-to-noise ratio of the instrument is increased on the basis that the weight of magnets is remarkably reduced; adjustment of the static magnetic field is convenient, free and very high in accuracy.

Description

technical field [0001] The invention relates to a portable sensor and instrument for analyzing rock physical properties of porous media such as core cuttings by using nuclear magnetic resonance, in particular to a portable nuclear magnetic resonance analysis sensor and a portable magnetic resonance analyzer. Background technique [0002] The nuclear magnetic resonance analysis instrument uses the principle of nuclear magnetic resonance to detect the fluid signal existing in the formation rock pores, obtains the hydrogen nucleus density, relaxation and diffusion characteristics in the formation fluid, and converts the nuclear magnetic resonance signal directly or indirectly into the key information of pores and fluids. Including: porosity, pore size distribution, fluid type and content, fluid mobility, etc. These information are of great significance for the evaluation of oil and gas reserves and the decision-making of development plans. With its fast, accurate, non-destructi...

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Problems solved by technology

[0009] In order to overcome the design of the NMR sensor in the prior art, the signal-to-noise ratio of the instrument is poor because of its bulky magnet structure, or the poor uniformity of its magnetic field due to difficulty in adjustment, or because it is limited by the position of the sample. Or the size cannot be flexibly measured; and while reducing the volume of the magnet to obtain mobility, it is difficult to control the uniformity of the magnetic field in a larger working area. The invention provides a portable nuclear magnetic resonance analysis sensor, which is characterized in that, It includes: an outer magnetic ring, including a first magic ring composed of a plurality of first magnets, and the magnetization direction of the plurality of first magnets changes one by one along the first circumferential direction; an inner magnetic ring, located at the outer magnetic ring The inner side includes a second magic ring surrounded by a plurality of second magnets, the magnetization directions of the plurality of second magnets change one by one along the second circumferential direction, and the axial height of the second magnets is smaller than that of the first magnets. The axial height of a magnet; adjust the magnet group, distributed in the inner side of the outer magnetic ring, including a third magic ring composed of at least two third magnets, the magnetization direction of the at least two third magnets is along the first The direction of the two circles changes one by one

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