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Apparatus and methods for J-edit nuclear magnetic resonance measurement

A nuclear magnetic resonance and measured value technology, which is applied in magnetic resonance measurement, measurement using NMR imaging system, and electronic magnetic resonance/nuclear magnetic resonance detection, etc. unevenness etc.

Inactive Publication Date: 2005-05-04
SCHLUMBERGER OVERSEAS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method described is less sensitive to magnetic field homogeneity, it is still somewhat affected by magnetic field homogeneity
uneven field B 0 (static) make valid B 1 (RF) field inhomogeneity
As a result, the π pulse may not remain correct throughout the area being investigated
Incorrect π pulses may make the J modulation signal smaller

Method used

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  • Apparatus and methods for J-edit nuclear magnetic resonance measurement
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Embodiment Construction

[0029] Embodiments of the invention relate to methods for J-based coupling (eg, 1 H- 13 C) Apparatus and method for NMR logging. Embodiments of the present invention are based on J-coupling (e.g., 1 H- 13 C) Based on measurements of spin echo amplitude effects. The method according to the invention is less sensitive to magnetic field homogeneity. Modulation of the effect of J coupling on spin echo amplitude is also referred to as "J editing" in this specification. J editing can be used to determine the detailed composition of oil samples, for example, the abundance of different carbon groups. These carbon groups can include tetravalent C, aromatic CH, aliphatic CH, CH 2 , CH 3 and CH 4 .

[0030] The method of the invention can be carried out with NMR apparatus similar to those known in the prior art. NMR instruments can be in the laboratory or as part of a wireline logging tool, logging while drilling (NWD) tool, or logging while drilling (LWD) tool. Additionally, ...

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Abstract

A method for obtaining nuclear magnetic resonance measurements includes inducing a static magnetic field in a formation fluid sample; applying an oscillating magnetic field to the fluid sample according to a preparation pulse sequence that comprises a J-edit pulse sequence for developing J modulation; and acquiring the nuclear magnetic resonance measurements using a detection sequence, wherein the detection sequence comprises at least one 180-degree pulse. The method may further include acquiring the nuclear magnetic resonance measurements a plurality of times each with a different value in a variable delay in the J-edit pulse sequence; and analyzing amplitudes of the plurality of nuclear magnetic resonance measurements as a function of the variable delay to provide J coupling information.

Description

technical field [0001] The present invention generally relates to well logging using nuclear magnetic resonance (NMR) tools. More specifically, the present invention relates to apparatus and methods for nuclear magnetic resonance logging based on J-coupling of carbon-hydrogen nuclei. Background technique [0002] Oil and gas exploration and production is a very costly operation. Knowledge about formations is invaluable in drilling to help reduce unnecessary waste of resources. Accordingly, the oil and gas industry has developed various tools capable of determining and predicting the formation properties of formations. Among the different types of tools, nuclear magnetic resonance (NMR) instruments have proven to be very useful. NMR tools can be used to determine formation properties such as the proportional volume of pores and the proportional volume of flowing fluid-filled pores. US Patent No. 6,140,817 describes the general background of NMR logging. [0003] NMR is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/44G01V3/32
CPCG01N24/081G01V3/32Y02A90/30G01R33/54
Inventor K·加内桑Y·-Q·宋L·安
Owner SCHLUMBERGER OVERSEAS SA
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