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Method for measuring content of different state water in coal

A state, content technology, applied in the direction of analysis by nuclear magnetic resonance, etc., to achieve the effect of easy operation

Inactive Publication Date: 2013-02-27
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for measuring the moisture content of different states in coal, which solves the problem of how to measure the moisture content of different states in coal

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  • Method for measuring content of different state water in coal
  • Method for measuring content of different state water in coal
  • Method for measuring content of different state water in coal

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Embodiment Construction

[0016] The method of the invention mainly measures the moisture content in different states in the coal by low-field nuclear magnetic resonance technology. For saturated water samples, the low-field NMR technique detects the H nuclei of water in the sample, and its signal is proportional to the water content in the sample, and the water in pores of different sizes has different transverse relaxation times (T 2 ) feature, the longer the relaxation time, the larger the pore radius where the observed water exists. Such as figure 1 As shown, the low-field NMR T of the coal sample 2 The spectrum generally has the characteristics of "three peaks", and its peaks are respectively at 0.1-2.5ms, 5-50ms, and 100-300ms, which are called S 1 , S 2 , S 3 . However, the presence or absence of the three spectral peaks in each saturated coal sample is related to the pore characteristics of the sample, and the lowest point between the two peaks or the turning point of the spectral peaks is...

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Abstract

The invention discloses a method for measuring the content of different state water in coal. The method comprises the steps of performing low field nuclear magnetic resonance measurement on a saturated coal sample to obtain a transverse relaxation time T2 spectrum of the saturated coal sample, calculating integral areas of the T2 spectrum of each spectral unit volume saturated coal sample; and conversing the integral areas of the T2 spectrum of each spectral unit volume saturated coal sample to the volume percent of the different state water according to obtained conversion modes established by preset standard samples. The method solves the problem that how to measure the content of different state water in the coal.

Description

technical field [0001] The invention relates to the field of measuring the water content characteristics of coal reservoirs, in particular to a method for measuring the water content in different states in coal. Background technique [0002] Water in coal reservoirs has diverse storage and migration patterns, which have different meanings for coalbed methane exploitation. The water in coal not only affects the adsorption, desorption and production of methane in coal, but also affects the decision-making of engineering measures in the process of coalbed methane development. [0003] In conventional coal industry analysis, the moisture in coal is divided into extrinsic moisture and intrinsic moisture. Extrinsic moisture is the water that exists on the surface of coal particles, coal particle cracks and non-capillary cavities, and intrinsic moisture is the water that exists in the capillary pores of coal. However, in actual measurement, it is difficult to strictly separate the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
Inventor 姚艳斌刘俊刚刘大锰吴建国
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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