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

Active Publication Date: 2015-12-02
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nuclear magnetic resonance logging instrument probe with multiple layers of magnets and antenna excitation method
  • Nuclear magnetic resonance logging instrument probe with multiple layers of magnets and antenna excitation method
  • Nuclear magnetic resonance logging instrument probe with multiple layers of magnets and antenna excitation method

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a nuclear magnetic resonance logging instrument probe with multiple layers of magnets and an antenna excitation method. The nuclear magnetic resonance logging instrument probe comprises a probe skeleton, a plurality of magnet assemblies and a plurality of antennas. The probe skeleton is in a cylindrical shape. The multiple magnet assemblies are evenly distributed in the peripheral direction of the probe skeleton. Each magnet assembly comprises at least two layers of magnets sequentially arranged from top to bottom, wherein the magnetizing direction of the magnets is the radial direction, and the magnetizing directions of every two adjacent layers of magnets in each magnet assembly are opposite; the outer side of each magnet assembly is provided with one antenna, and the multiple antennas achieve feeding independently. According to the nuclear magnetic resonance logging instrument probe and the antenna excitation method, stratum information detection of different azimuth angles can be achieved by exciting the different antennas, the peripheral distinguishing capacity of the nuclear magnetic resonance logging instrument probe is improved, and stratum detection under the radial, axial and peripheral three-dimension scales 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 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): E21B49/00E21B47/022
CPCG01V3/32G01N24/081G01R33/3415G01R33/3808G01R33/383
Inventor 肖立志廖广志杜群杰罗嗣慧
Owner CHINA UNIV OF PETROLEUM (BEIJING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap