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Nuclear Magnetic Resonance Logging Tool with Multiple Detection Depths and Its Probe and Antenna Excitation Method

A nuclear magnetic resonance and logging tool technology, which is applied in the measurement of magnetic variables, material analysis and measurement through resonance, can solve the problems of lack of signal detection capabilities in circumferential multi-directional sensitive areas, and achieve improved circumferential resolution, The effect of improving the detection ability

Active Publication Date: 2018-04-17
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a nuclear magnetic resonance logging tool probe, a nuclear magnetic resonance logging tool 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 perform signal detection in the radial depth dimension and axial depth dimension, Technical issues without signal detection capabilities for circumferential multi-directional sensitive areas

Method used

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  • Nuclear Magnetic Resonance Logging Tool with Multiple Detection Depths and Its Probe and Antenna Excitation Method
  • Nuclear Magnetic Resonance Logging Tool with Multiple Detection Depths and Its Probe and Antenna Excitation Method
  • Nuclear Magnetic Resonance Logging Tool with Multiple Detection Depths and Its Probe and Antenna Excitation Method

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Embodiment 1

[0036] Embodiment 1 of the present invention provides a nuclear magnetic resonance logging tool probe. figure 1 It is a schematic structural diagram of the NMR logging tool probe provided in Embodiment 1 of the present invention. like figure 1 As shown, the nuclear magnetic resonance logging tool probe in this embodiment may include: a housing (not shown in the figure), a magnet 1, and an antenna array device 2;

[0037] The magnet 1 is fixedly arranged in the casing;

[0038] The antenna array device 2 includes at least two groups of antenna arrays distributed along the circumference of the magnet 1, and each group of antenna arrays includes N layers of independently fed antennas;

[0039] The kth layer antenna is arranged between the magnet 1 and the k+1th layer antenna, wherein, N is a natural number ≥ 2, k=1, 2, ... N-1;

[0040] The antenna is fixed on the bracket, and the bracket is fixedly connected with the casing.

[0041] Specifically, the magnet 1 can be cylindr...

Embodiment 2

[0054] Embodiment 2 of the present invention provides a nuclear magnetic resonance logging tool probe, which is used in a centered nuclear magnetic resonance logging tool. In the nuclear magnetic resonance logging instrument probe provided in this embodiment, the magnet is a cylindrical magnet, and the magnetization direction of the cylindrical magnet is radial, and the antenna array device includes four sets of antenna arrays, and the four sets of antenna arrays are evenly distributed along the circumference of the magnet; Each group of antenna arrays includes at least two layers of independently fed antennas, and the first layer of antennas is arranged between the magnet and the second layer of antennas.

[0055] The nuclear magnetic resonance logging tool probe provided in this embodiment has four groups of antenna arrays evenly distributed around the magnet. By exciting different antenna arrays, formation information detection at four different azimuth angles can be realize...

Embodiment 3

[0057] Embodiment 3 of the present invention provides a nuclear magnetic resonance logging tool probe, which is used in a borehole wall-attached nuclear magnetic resonance logging tool. In the nuclear magnetic resonance logging tool probe provided by this embodiment, the magnet can include a main magnet and a shielding magnet, the main magnet and the shielding magnet are cuboids, and the thickness of the main magnet is greater than the thickness of the shielding magnet; at least two groups of antenna arrays are arranged on the main magnet On one side; each group of antenna arrays includes at least two layers of independently fed antennas; the first layer of antennas is arranged between the main magnet and the second layer of antennas.

[0058] Among them, the magnetization directions of the main magnet and the shielding magnet are perpendicular to their axial directions, and the shielding magnet can make the magnetic force lines of the magnetic field in the far region more conc...

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Abstract

The present invention provides a multi-detecting depth nuclear magnetic resonance logging tool and probe, and an antenna excitation method, the probe of nuclear magnetic resonance logging tool includes: a housing, a magnet and an antenna array apparatus; the magnet is fixedly arranged in the housing; the antenna array apparatus includes at least two groups of antenna arrays distributed along circumference of the magnet, and each group of antenna arrays include N layers of independently fed antennas; k-th layer antenna is arranged between the magnet and (k+1)-th layer antenna, k=1, 2, . . . N−1; the antenna is fixed on a support, and the support is fixedly connected to the housing. In the present invention, stratum information detection at different azimuth angles is achieved by exciting different antenna arrays, so that circumferential recognizing capability of nuclear magnetic resonance logging tool probe is improved and three-dimensional (radial, axial and circumferential) stratum detection is 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, a nuclear magnetic resonance logging tool 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 perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/12E21B47/08
CPCG01R33/3415G01N24/081
Inventor 肖立志孙哲廖广志罗嗣慧李新杜群杰刘伟陈伟梁王杰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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