Nuclear magnetic resonance logging instrument probe with multiple layers of magnets and antenna excitation method
A technology of nuclear magnetic resonance and logging tools, which is applied in the fields of electron magnetic resonance/nuclear magnetic resonance detection, electric/magnetic detection for well logging records, material analysis through resonance, etc. Issues such as signal detection ability in sensitive areas, to achieve the effect of improving circumferential resolution, performance, and uniform magnetic field strength
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Embodiment 1
[0036] An embodiment of the present invention is a nuclear magnetic resonance logging tool probe. The nuclear magnetic resonance logging tool probe in this embodiment may include: a probe frame, a plurality of magnet assemblies and a plurality of antennas; the probe frame is cylindrical, and the plurality of magnet assemblies are evenly distributed in the circumferential direction of the probe frame.
[0037] figure 1 Embodiment 1 of the present invention provides a schematic structural diagram of multiple magnet assemblies in a probe of an NMR logging tool. Such as figure 1 As shown, the probe includes eight magnet assemblies, each magnet assembly includes at least two layers of magnets arranged in sequence from top to bottom, the magnetization direction of the magnet is radial, and the magnetization direction of two adjacent layers of magnets in the magnet assembly On the contrary; an antenna is provided on the outside of each magnet assembly, and multiple antennas are ind...
Embodiment 2
[0062] 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:
[0063] Excite one antenna to realize the detection of a single azimuth downhole;
[0064] Excite at least two antennas to realize downhole multi-azimuth detection;
[0065] Excite all antennas to realize all-round underground detection.
[0066] The principle of the antenna excitation method provided in this embodiment is similar to that in Embodiment 1, and will not be repeated here.
[0067] 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
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