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Three-dimensional nuclear magnetic resonance logging tool probe, logging tool and antenna excitation method

A technology of nuclear magnetic resonance and logging tools, which is applied in electron magnetic resonance/nuclear magnetic resonance detection, electrical/magnetic detection for well logging records, boreholes/well components, etc. Sensitive area signal detection ability and other issues, to achieve the effect of improving the circumferential resolution

Active Publication Date: 2018-04-10
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 present invention provides a three-dimensional nuclear magnetic resonance logging tool probe, a logging tool and an antenna excitation method 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 the axial depth dimension, and cannot Technical Issues of Signal Detection Capability with Circumferential Multi-Azimuth Sensitive Areas

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  • Three-dimensional nuclear magnetic resonance logging tool probe, logging tool and antenna excitation method
  • Three-dimensional nuclear magnetic resonance logging tool probe, logging tool and antenna excitation method
  • Three-dimensional nuclear magnetic resonance logging tool probe, logging tool and antenna excitation method

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Embodiment 1

[0048] Embodiment 1 of the present invention provides a three-dimensional nuclear magnetic resonance logging tool probe. figure 1 It is a schematic structural diagram of the probe of the 3D nuclear magnetic resonance logging tool provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the three-dimensional nuclear magnetic resonance logging tool probe in this embodiment may include: a probe frame 10, a magnet, and an antenna;

[0049] Four magnets are evenly distributed on the probe frame 10 circumferentially, and the magnets are magnetized along the radial direction of the probe frame 10, wherein the magnetization direction of the two opposite magnets is from outside to inside, and the magnetization direction of the other two opposite magnets is The direction is from inside to outside;

[0050] In the probe frame 10, an antenna for independent power feeding is respectively arranged corresponding to each magnet;

[0051] The antenna corresponding to th...

Embodiment 2

[0075] Embodiment 2 of the present invention provides a three-dimensional nuclear magnetic resonance logging tool probe. The three-dimensional nuclear magnetic resonance logging tool probe in this embodiment is based on the three-dimensional nuclear magnetic resonance logging tool probe provided in the first embodiment, and has been improved as follows:

[0076] Among the two adjacent magnets, the magnetization direction of the former magnet is perpendicular to the magnetization direction of the latter magnet; among the two antennas corresponding to the former magnet, the antenna closest to the latter magnet corresponds to the latter magnet Among the two antennas, the antenna closest to the previous magnet is connected by a switch.

[0077] Specifically, two adjacent magnets refer to two magnets whose magnetization directions are perpendicular, one of which is used as a previous magnet, and the other is used as a subsequent magnet. For example, adjacent east magnet 11 and sou...

Embodiment 3

[0097] Embodiment 3 of the present invention provides a logging tool, including the three-dimensional nuclear magnetic resonance logging tool probe described in any one of the above embodiments. In this embodiment, the structure and function of each part of the probe of the three-dimensional nuclear magnetic resonance logging tool are similar to those of the foregoing embodiments, and will not be repeated here.

[0098] In the logging tool provided in this embodiment, four magnets are evenly distributed in the circumferential direction of the probe frame 10, and two antennas are respectively independently fed on both sides of each magnet. By exciting different antennas, different magnets can be realized. The azimuth formation information detection improves the circumferential resolution capability of the nuclear magnetic resonance logging tool probe, and realizes the formation detection in the radial, axial and circumferential three-dimensional scales.

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Abstract

The invention provides a three-dimensional nuclear magnetic resonance logging tool probe, logging tool and antenna excitation method. The probe includes: a probe frame, a magnet, and an antenna; the probe frame has four magnets evenly distributed in the circumferential direction. The magnets are magnetized along the radial direction of the probe frame, where the magnetizing direction of the two opposite magnets is from outside to in, and the magnetizing direction of the other two opposite magnets is from inside to outside; in the probe frame In the middle, an independently fed antenna is provided corresponding to each magnet; the antenna corresponding to the magnet includes a left antenna arranged on one side of the magnet and a right antenna arranged on the other side of the magnet; The left antenna and the right antenna corresponding to each magnet are electrically connected. The three-dimensional nuclear magnetic resonance logging tool probe, logging tool and antenna excitation method provided by the invention improve the circumferential resolution ability of the nuclear magnetic resonance logging tool probe.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance logging, in particular to a probe of a three-dimensional nuclear magnetic resonance logging tool, a 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 performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/0228
CPCG01N24/081G01R33/3808G01R33/383G01V3/32
Inventor 肖立志李新廖广志罗嗣慧孙哲刘伟陈伟梁王杰廖坤铁
Owner CHINA UNIV OF PETROLEUM (BEIJING)