An experimental method and experimental system for the synthesis and decomposition of natural gas hydrate

Abstract

The invention provides an experimental method for synthesizing and decomposing natural gas hydrate and an experiment system. An inlet standard volume chamber and an outlet standard volume chamber are included and can optimize synthesis and decomposition of the natural gas hydrate, the inlet standard volume chamber can be used for supplying natural gas to a porous medium in a high-pressure reaction kettle in stages and accurately calculating the consumption of the natural gas in the synthesizing process of the natural gas hydrate, and the outlet standard volume chamber is used for enabling the natural gas hydrate to be decomposed in stages, solving the problem that a pipeline is frozen and blocked as temperature drops abruptly when the natural gas hydrate is decomposed in a common decomposition method and metering the amount of natural gas released in the decomposing process of the natural gas hydrate.

Description

technical field [0001] The invention belongs to the field of natural gas hydrate experiments, in particular to an experimental method and an experimental system for the synthesis and decomposition of natural gas hydrates. Background technique [0002] As a new potential energy source with clean, efficient and abundant reserves, natural gas hydrate has been highly concerned and researched by many countries. Since the 1990s, with the increase of natural gas hydrate deposits discovered in various countries and the further deepening of people's understanding of natural gas hydrate, the research on natural gas hydrate has expanded rapidly worldwide. Its research focus has also shifted to the stage of practical development. At this stage, the research on gas hydrate has made a big step forward both in terms of method and depth. In the past 20 years, great progress has been made in the basic research of natural gas hydrate, involving the physical and chemical characteristics of na...

AI Technical Summary

Problems solved by technology

In the published technical patents for the synthesis and decomposition of natural gas hydrates, the methods for detecting and calculating the saturation of natural gas hydrates in sediments include electrical methods, ultrasonic detection methods, and time-domain reflectometry, but the design of these test methods is complicated. , the cost is high, and the gas hydrate saturation cannot be accurately calculated

Among them, the resistance method is based on the change of the ion content in the solution, which causes the change of the conductivity, and methane is difficult to ionize in the aqueous solution, and the ion changes too little, so it is difficult to measure

Ultrasonic detection methods and time domain reflectometry must be based on accurate known calculation models in order to calculate gas hydrate saturation. Currently, there are some models for the relationship between hydrate saturation, sound velocity and dielectric constant. One type is a simple empirical formula, which lacks rigorous theoretical basis; the other type is theories and equations based on complex physical models. These models have rigorous theoretical derivation, but involve many calculation parameters and are difficult to determine The value of each parameter in the actual situation

In addition, according to the existing experiments, the results of hydrate saturation calculated by different models in the same area are very different.

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