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Method for measuring porosity of coal core

A technology of porosity and coal core, applied in measuring devices, suspension and porous material analysis, scientific instruments, etc., to achieve the effect of high detection accuracy and short time consumption

Active Publication Date: 2013-04-03
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for measuring coal core porosity, which solves the problem of how to accurately measure coal core porosity by means of low-field nuclear magnetic resonance

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  • Method for measuring porosity of coal core
  • Method for measuring porosity of coal core
  • Method for measuring porosity of coal core

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Embodiment Construction

[0016] The method of the invention mainly measures the porosity of the coal core by means of low-field nuclear magnetic resonance. For saturated water samples, the low-field NMR technology detects the H nuclei of water in the sample, and the instrument collects the CPMG spin echo train of the water NMR signal in the sample. The initial signal amplitude obtained by multi-exponential inversion of the spin echo train is proportional to the water content in the sample, so that the absolute pore volume of the sample can be obtained. After measuring the sample volume, the porosity value of the sample can be obtained.

[0017] The method of the present invention specifically comprises the steps:

[0018] 1) Make a standard sample: prepare a certain concentration of MnCl with distilled water 2 solution, its transverse relaxation time T 2 Keep between 10-100ms, take the above solution at equal intervals to make standard samples with different porosities (≤10%);

[0019] 2) Establis...

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Abstract

The invention discloses a method for measuring the porosity of a coal core. The method comprises the following steps of setting echo of measuring parameters of a low-field nuclear magnetic resonance instrument to be 0.10 microseconds; carrying out low-field nuclear magnetic resonance measurement on the saturated coal core after surface moisture is removed so as to obtain a spectrum T2 of transverse relaxation time of the saturated coal core; calculating an integral area of the spectrum T2of the saturated coal core in unit volume; and calculating to obtain a porosity value of the coal core through the integral area of the spectrum T2of the saturated coal core in the unit volume according to conversion relation established by an obtained preset standard sample. With the adoption of the method provided by the invention, the porosity of a core hole is reflected by a signal generated by moisture in a sample hole in a low-field nuclear magnetic resonance manner, so that the detection precision is high, and the consumed time is short.

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 porosity of coal cores. Background technique [0002] Coal core porosity is one of the important parameters in the study of coal reservoir physical properties. Most conventional tests use helium porosimeters. However, some coals are brittle and easily deformed or even broken under pressure. At the same time, the test of this method is cumbersome, and it is difficult to realize the application in the exploration field. Low-field NMR technology has become a hot spot for experimental exploration due to its fast and non-destructive advantages. Portable low-field NMR instruments are expected to realize the application of on-site mud logging, so as to realize timely on-site acquisition of reservoir physical parameters. [0003] The reasonable setting of the parameters of the low-field NMR instrument is the necessary prerequisit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 姚艳斌刘俊刚刘大锰吴建国李俊乾
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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