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NMR logging instrument probe with double-layer magnet and antenna excitation method

A nuclear magnetic resonance and logging tool technology, which is applied in the directions of electronic magnetic resonance/nuclear magnetic resonance detection, electrical/magnetic detection and measurement for logging records, etc., and can solve the problem of signal detection in sensitive areas without circumferential multi-directional ability and other issues, to achieve the effect of increasing the circumferential resolution, saving costs, and improving the circumferential resolution.

Active Publication Date: 2018-03-09
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a nuclear magnetic resonance logging tool probe and an antenna excitation method, which are used to solve the problem that the nuclear magnetic resonance logging tool probe in the prior art can only detect signals in the radial depth dimension and axial depth dimension, and does not have circumferential multi-directional Technical issues of signal detection capability in sensitive areas

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  • NMR logging instrument probe with double-layer magnet and antenna excitation method
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  • NMR logging instrument probe with double-layer magnet and antenna excitation method

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Embodiment 1

[0043] Embodiment 1 of the present invention provides a nuclear magnetic resonance logging tool probe. The nuclear magnetic resonance logging tool probe in this embodiment may include: a probe frame and a shielding layer 1 arranged in the probe frame;

[0044] A plurality of main magnets are respectively arranged above and below the shielding layer 1;

[0045] The central axes of each main magnet are parallel to each other, and the distance between the central axis of each main magnet and the central axis of the probe frame is equal;

[0046] The distance between the central axes of any two main magnets is not less than a first preset value;

[0047] An antenna is arranged on the outer side of each main magnet, and multiple antennas are fed independently.

[0048] Specifically, the probe frame in this embodiment may be a columnar structure, and a housing cavity may be provided in the probe frame, and the shielding layer 1 and the main magnet may be fixed in the housing cavit...

Embodiment 2

[0077] Embodiment 2 of the present invention provides an antenna excitation method based on the NMR logging tool probe described in any one of the above embodiments. The antenna excitation method in this embodiment may include:

[0078] Excite one antenna to realize the detection of a single azimuth downhole;

[0079] Excite at least two antennas to realize downhole multi-azimuth detection;

[0080] Excite all antennas to realize all-round underground detection.

[0081] The principle of the antenna excitation method provided in this embodiment is similar to that in Embodiment 1, and will not be repeated here.

[0082] In the antenna excitation method provided in this embodiment, by exciting different antennas, formation information detection at different azimuth angles can be realized, the circumferential resolution capability of the nuclear magnetic resonance logging tool probe is improved, and radial, axial, and circumferential directions are realized. Formation detectio...

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Abstract

The present invention provides a nuclear magnetic resonance logging instrument probe with double-layered magnets and an antenna excitation method, the nuclear magnetic resonance logging instrument probe includes: a probe framework and a shielding layer arranged in the probe framework; a plurality of main magnets are provided above and below the shielding layer, respectively; central axes of the main magnets are parallel with each other, and distances between the central axes of each of the main magnets and a central axis of the probe framework are the same; a distance between central axes of any two main magnets is not smaller than a first preset value; and an antenna is provided at outer side of each main magnety. In the present invention, circumferential recognizing capability of the nuclear magnetic resonance logging instrument probe can be improved and three-dimensional (radial, axial and circumferential) stratum detection can be achieved.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance logging, in particular to a nuclear magnetic resonance logging tool probe and an antenna excitation method. Background technique [0002] The phenomenon of nuclear magnetic resonance (Nuclear Magnetic Resonance, NMR) was discovered in 1946, and it was soon applied in the fields of physics, chemistry, material science, life science and medicine. In the 1950s, NMR began to be applied in the oil and gas industry, initially in the field of reservoir rock physics. The nuclear magnetic resonance logging tool can use the principle of nuclear magnetic resonance to detect the formation information around the borehole, and has unique qualitative identification and quantitative evaluation capabilities of reservoir fluid. [0003] The probe is one of the important parts of the NMR logging tool. The structure of the probe determines the key performances such as the measurement mode of the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/022
CPCG01V3/32G01R33/341G01R33/3808
Inventor 肖立志廖广志杜群杰李新罗嗣慧
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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