Method for nuclear magnetic resonance measurement of coal core average pore compression coefficient

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: 2015-10-28
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

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  • Method for nuclear magnetic resonance measurement of coal core average pore compression coefficient
  • Method for nuclear magnetic resonance measurement of coal core average pore compression coefficient
  • Method for nuclear magnetic resonance measurement of coal core average pore compression coefficient

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[0026] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to further understand the present invention.

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

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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 coal reservoir physical property measurement, in particular to a method for measuring the average pore compressibility of a coal core 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, which is one of the important parameters that characterize coal reservoirs. It has important application value in the evaluation of coal reservoirs and the development of coalbed methane. Conventional tests mainly include gaseous method and liquid method, but the test is cumbersome and difficult to realize the application on the exploration site. The low-field nuclear magnetic test method has become a hot spot of experimental exploration due to its fast and non-destructive advantages. The portable low-field nuclear magnetic resonance instrument is expected to realize the application of on-site logging, so as to realize t...

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Application Information

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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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