High-pressure experimental system for simulating leakage type natural gas hydrate formation/decomposition

Abstract

The invention discloses a high-pressure experimental system for simulating leakage type natural gas hydrate formation / decomposition, which comprises a visual large-volume high-pressure transparent reaction kettle, a gas supply system, a temperature control system, a power system and a data acquisition system, wherein the gas supply system is connected with the reaction kettle and can provide flowing gas at required pressure, temperature and humidity for the reaction kettle; the temperature control system is used for providing the required temperature and the humidity for the reaction kettle; the power system is connected with the reaction kettle and can provide a vacuum environment for the reaction kettle and ensure smooth circulation of the gas; and the data acquisition system is connected with the reaction kettle and used for acquiring data, such as the temperature, the pressure, electrical conductivity, flow rate and the like in real-time, recording and processing the data and performing observation experiments. The high-pressure experimental system can simulate the process that the gas forms hydrates in three sections of different phases while moving under different flow rates, thereby describing characteristics of heat transfer and mass transfer of the hydrates formed by the leaked gas in a leakage system and providing references and similar parameter data for researchingthe hydrates under actual sea bottom similar conditions. Simultaneously, the experimental system and a method can further develop the corresponding hydrate decomposition research.

Description

technical field [0001] The invention relates to the research field of natural gas hydrate formation / decomposition, in particular to a high-pressure complete experimental system for simulating seepage type natural gas hydrate formation / decomposition. Background technique [0002] Natural gas hydrate in seabed sediments is an important discovery in the field of new energy in the world in the past two decades. The seepage-type hydrate layer is regarded as a The storage with the most commercial value, the formation, distribution, accumulation and exploitation of this kind of hydrate are currently research hotspots in this field. [0003] The formation and accumulation of seepage-type hydrates in seabed sediments is the result of multiphase flow, and free gas plays an important role in this process. The composition of free gas in pore water and the degree of gas migration determine the hydrate Another important factor is the geological structure of the sedimentary strata. The pa...

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Problems solved by technology

At present, the research on the formation kinetics of hydrate in porous media is still very incomplete, mainly because the microscopic mechanism of its formation is complicated, and the accuracy of experimental testing is not enough, which leads to large deviations. Laboratory simulations of seabed hydrate kinetics research usually use ice ( water) and methane (carbon dioxide) to synthesize hydrates in the sand layer, or to use the bubbling reaction device to feed gas and stir to form hydrates, but these simulations cannot completely and accurately describe the gas (bubbles) in the flow process in the porous media the formation process

[0004] The collection and analysis of the literature (papers, reports and patents) published so far shows that there are very few experimental devices and systems dedicated to the study of seepage-type hydrate formation / dissociation, and generally do not have a large experimental space and are suitable for the seabed. The high pressure of the environment, and most importantly does not provide the range of gas fluxes that match the experimental space

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