Natural gas hydrate multifunctional testing system and method

Abstract

The invention provides a multifunctional testing system and method for natural gas hydrate. According to the invention, the multifunctional testing system and method can highly efficiently determine the generation mass, structure type, thermodynamic conditions and generation rate of the natural gas hydrate by utilizing the variable quantities of reactants participating in a reaction and environmental conditions, determine the advantages and disadvantages of a natural gas hydrate inhibitor and the like while producing the natural gas hydrate; and the testing method is a comprehensive testing and analyzing means, provides a simple and feasible manner for further research on the structural characteristics and changing rules of the natural gas hydrate and is of important significance to understanding of the formation mechanism, microscopic dynamics, phase transition and the like of the natural gas hydrate. In particular, an artificial neural network model is established on the basis of a training database formed by known data, so accurate determination of the structure types of the natural gas hydrate is realized, and a research direction is provided for rapid determination of the structure types of the natural gas hydrate.

Description

technical field [0001] The invention belongs to the technical field of testing, and relates to a natural gas hydrate multifunctional testing system and method, in particular to a natural gas hydrate multifunctional testing system and method capable of simultaneously measuring multiple properties such as the quality of natural gas hydrate formation and structure type. Background technique [0002] Gas hydrate is a kind of gas molecules (including hydrocarbons and CO 2 、H 2 The clathrate hydrate formed by S and other non-hydrocarbon gases) and water molecules in a high-pressure and low-temperature environment mainly includes three types of crystals: type I (cubic crystal structure), type II (rhombic crystal structure) and type H (hexagonal crystal structure) structure. [0003] Structure Type I hydrate single crystal is a body-centered cubic structure, containing 46 water molecules, composed of 2 small voids and 6 large voids. The small gap is a pentagonal dodecahedron (5 ...

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Problems solved by technology

"Research Progress in Methane Hydrate Raman Spectroscopy" published in "Spectroscopy and Spectral Analysis" (No. 9, pp. 2457-2461, 2009) uses the Raman spectrum of methane hydrate to be tested. It brings to judge the different structure types of hydrates. Its advantage is that the temperature and pressure range of the experiment is wide, and the hydrates can be observed in situ under the conditions of low temperature and high pressure; but it only judges the structure types of methane hydrates. Single, and the standard Raman spectrum library in the field of hydrates has not been established, resulting in some experimental spectra without comparison standards and unable to obtain relevant information

Published in "Journal of Spectroscopy" (No. 3, pp. 465-474, 2012), in "Application of Solid State NMR Technique in the Study of Gas Hydrates", using the method of guest molecules filled in different cages of hydrates 13 The C NMR spectrum has a corresponding chemical shift, which is observed in the experiment and the known structure of the sample 13 C-spectrum chemical shift comparison to identify the structure of hydrates, this technology can be applied to the research on the monitoring of hydrate formation / decomposition kinetics; but it has great limitations on experimental conditions, such as the NMR probe has a high Requirements, the probe must adapt to very low temperature and need to have a wide temperature operating range; this technology also has high requirements for the particularity of the experimental sample, it needs to use 13 C-enriched samples, for some complex molecules, require special order

"Application of X-ray Method in the Study of Natural Gas Hydrate" published in "Rock and Mineral Testing" (No. 4, pp. 468-479, 2014) produced when X-rays were used to irradiate crystals (or certain amorphous substances). Diffraction to study the internal structure of the crystal (that is, the internal atomic arrangement) analysis technology to obtain the structure type of hydrate; this technology is only a theoretical basis, and a high-pressure reaction device suitable for in-situ observation of XRD technology has not been developed, and only through It is difficult to accurately determine the structure type of hydrate by XRD technology, and it needs to be combined with other testing techniques to accurately obtain the structure information of hydrate

[0011] So far, there are no experimental and industrialized device reports on "judging the structure type of natural gas hydrate" in the public literature at home and abroad

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