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A method for measuring coal core average pore compressibility by nuclear magnetic resonance

A technology of pore compressibility and nuclear magnetic resonance, which is applied in the direction of analysis by nuclear magnetic resonance to achieve the effect of easy operation.

Active Publication Date: 2017-04-12
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for measuring coal core average pore compressibility by nuclear magnetic resonance, which overcomes the problem of how to finely measure coal core pore compressibility by using nuclear magnetic resonance

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  • A method for measuring coal core average pore compressibility by nuclear magnetic resonance
  • A method for measuring coal core average pore compressibility by nuclear magnetic resonance
  • A method for measuring coal core average pore compressibility by nuclear magnetic resonance

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Embodiment Construction

[0026] Below in conjunction with the accompanying drawings, specific embodiments of the present invention will be described in detail, so as to further understand the present invention.

[0027] The method of the invention mainly measures the coal core pore compressibility coefficient through low-field nuclear magnetic resonance technology. For saturated water samples, the low-field NMR technique detects the H nuclei of water in the sample. The instrument collects the CPMG (Carr-Purcell-Meiboom-Gill) spin echo train of the water NMR signal in the sample, and the initial signal amplitude obtained by multi-exponential inversion of the spin echo train is proportional to the water content in the sample, thus The volume of various types of pores in the sample can be obtained. By changing the confining pressure of the coal core, in which the pores are compressed and deformed, the amplitude of the nuclear magnetic signal under different confining pressures can be obtained, and then ...

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Abstract

The invention discloses a method for nuclear magnetic resonance measurement of a coal core average pore compression coefficient. The method comprises 1, carrying out low magnetic field nuclear magnetic resonance measurement on a saturated water coal core under different confining pressures to obtain transverse relaxation time T2 spectrums and spectrum peak areas of the saturated water coal core under the different confining pressures, and 2, calculating an average pore compression coefficient by the spectrum peak areas of the T2 spectrums according to a pore compression coefficient reduction formula. The method realizes fast, lossless and refined measurement of the coal core pore compression coefficient and can be operated simply.

Description

technical field [0001] The invention relates to the field of physical property measurement of coal reservoirs, in particular to a method for measuring the average pore compressibility coefficient of coal cores by nuclear magnetic resonance. Background technique [0002] The degree of change of coal pore volume with effective stress depends on the coal core pore compressibility coefficient, which is one of the important parameters to characterize the characteristics of coal reservoirs. It has important application value in the evaluation of coal reservoirs and the development of coalbed methane. Routine tests mainly include gaseous and liquid methods, but the tests are cumbersome and difficult to implement on-site exploration. The low-field NMR testing method has become a hot spot for experimental exploration due to its fast and non-destructive advantages. The portable low-field NMR instrument is expected to realize the application of on-site mud logging, so as to realize the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
Inventor 李松汤达祯许浩陶树刘彦飞
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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