A method for inhibiting hydrate decomposition and hydrate storage and transportation method
A technology for inhibiting hydrates and hydrates, applied in the direction of gas fuels, petroleum industry, fuels, etc., can solve the problems that cannot be applied to the storage and transportation of gas hydrates above the freezing point, so as to prevent the hydrate decomposition process, inhibit the decomposition process, and inhibit The effect of hydrate decomposition
Active Publication Date: 2020-10-16
XIANGNAN UNIV
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Problems solved by technology
In addition, the temperature of the above method only works below 273K (the freezing point of water), and there is no self-protection effect above 273K, that is, it will not inhibit the decomposition of hydrate
Therefore, the patent application document CN10461435A only provides a self-protection effect for gas storage using the decomposition of hydrates below the freezing point, which is only applicable to the storage and transportation of gas hydrates below the freezing point, and cannot be applied to the storage and transportation of gas hydrates above the freezing point. process
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[0024] In order to describe the technical content, achieved goals and effects of the present invention in detail, the following descriptions will be made in conjunction with the embodiments and accompanying drawings.
[0025] Embodiment 1 of the present invention is: a method for inhibiting the decomposition of hydrates, and the hydrates utilize such as figure 1 The reaction setup shown produces methane hydrates at 266.0 K in a 500 ppm SDS solution. After the formation, the methane gas in the gas phase was discharged. After the gas was discharged, several groups of experiments were carried out without cover, THF cover and cyclohexane cover. After covering (injection by mechanical pump), the pressure generated by methane gas after hydrate decomposition is collected online. After 12 hours, the temperature was raised to 293.2K to completely decompose the hydrate. The percentage of hydrate dissociation at different times can be calculated from the data. figure 2 It is the time...
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The invention discloses a method for inhibiting hydrate decomposition and a hydrate storage and transportation method. The method comprises the following step: after a hydrate is formed, covering thesurface of the hydrate by a hydrate accelerant, wherein the hydrate accelerant comprises at least one of tetrahydrofuran and cyclohexane. When being injected into the hydrate, the hydrate accelerant disclosed by the scheme of the invention has an inhibition function on decomposition of the hydrate at not only 273.2K or less, but also 273.2K or greater. The hydrate accelerant disclosed by the scheme of the invention is added in an injection covering mode, so that the pressure in a hydrate method gas storage process can be reduced, and furthermore, the security of the gas storage process can beimproved.
Description
technical field [0001] The invention relates to the technical field of hydrates, in particular to a method for inhibiting the decomposition of hydrates and a storage and transportation method for hydrates. Background technique [0002] Gas hydrate refers to an ice-like non-stoichiometric cage compound formed by small molecule gas and water under low temperature and high pressure. In gas hydrates, water molecules form cages, and gas molecules fill the cages by virtue of the van der Waals force between them and water molecules. There is no fixed stoichiometric relationship between gas molecules and water molecules. Early studies on hydrates mainly focused on how to inhibit hydrate formation and the development of hydrate inhibitors during oil and gas transportation. In recent years, people have paid more and more attention to gas hydrate technology. The reasons mainly involve three aspects: There are two aspects: first, the huge amount of natural gas hydrate resources can be ...
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IPC IPC(8): C10L3/10
CPCC10L3/108
Inventor 陈俊曾耀松王涛喻星宇闫柯乐蒋建宏李家元邓斌曾凡花
Owner XIANGNAN UNIV