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Method and device for spin-echo correction of nuclear magnetic resonance while drilling

A spin echo and nuclear magnetic resonance technology, which is used in the detection of electronic magnetic resonance/nuclear magnetic resonance, and electrical/magnetic detection for logging records, etc., can solve problems such as distortion of formation spin echo trains, and achieve accurate physical Effects of Features

Active Publication Date: 2020-01-31
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] The present invention provides a method and device for correcting nuclear magnetic resonance spin echoes while drilling, which are used to solve the problem that the measured formation spin echo strings are distorted due to complex motion states in nuclear magnetic resonance logging while drilling

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  • Method and device for spin-echo correction of nuclear magnetic resonance while drilling
  • Method and device for spin-echo correction of nuclear magnetic resonance while drilling
  • Method and device for spin-echo correction of nuclear magnetic resonance while drilling

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0047] figure 1 A schematic flow diagram of a method for correcting spin-echo while drilling nuclear magnetic resonance provided by an embodiment of the present invention, as shown in figure 1 As shown, the method of this embodiment may include:

[0048] S101. During the process of logging the actual formation by the nuclear magnetic resonance logging tool while drilling, acquire the spin echo string output by the nuclear magnetic resonance logging tool while dril...

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Abstract

The invention provides a method and device for correcting spin echoes of while-drilling nuclear magnetic resonance. The method comprises the steps that in the process of logging an actual stratum through a while-drilling nuclear magnetic resonance logging instrument, a spin echo string output by the while-drilling nuclear magnetic resonance logging instrument and a movement state of the while-drilling nuclear magnetic resonance logging instrument are obtained; a spin echo string correcting curve is determined according to the movement state of the while-drilling nuclear magnetic resonance logging instrument and the corresponding relationship between the predetermined movement state and the spin echo string correcting curve; the spin echo string is corrected according to the spin echo string correcting curve; and the corrected spin echo string is subjected to inversion so as to obtain a T2 spectrum. Through the method, more precise stratum spin echo string signals can be obtained, and thus the T2 spectrum obtained by inversion can reflect the more realistic physical property of the stratum.

Description

technical field [0001] The invention mainly relates to nuclear magnetic resonance detection technology and nuclear magnetic resonance imaging technology, in particular to a method and device for correcting spin echo of nuclear magnetic resonance while drilling. Background technique [0002] NMR logging is logging through the response of the hydrogen nuclei in the formation to the external magnetic field. The specific process is: apply the frequency and the precession of the hydrogen nuclear magnetic moment to the nuclear spin system in the static magnetic field in the direction perpendicular to the static magnetic field. The alternating electromagnetic field with the same Larmor frequency makes the hydrogen nuclear magnetic moment transition to a high-energy state by absorbing the energy provided by the alternating electromagnetic field. When the alternating electromagnetic field is withdrawn, the hydrogen nucleus returns to a low-energy state due to the high-energy state in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/32
CPCG01V3/32
Inventor 肖立志胡琳廖广志侯学理汤天知陈涛余春昊李梦春
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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