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Publisher: InTech
Languages: English
Types: Part of book or chapter of book
Subjects:
1 2 3 The flowing of hot water or hot brine injected in the vessel can be regarded as the moving of a piston from the inlet to the outlet. The hydrate dissociation process is divided into three stages: free gas production, hydrate dissociation and residual gas production. The process of the hydrate dissociation is a process of the temperature decrease in the presence of the brine solution. The duration of the hydrate dissociation is shortened and the degree of the depth of the temperature drop increases with the increase of the brine concentration. The rate of instantaneous hydrate dissociation increases with the increase of brine concentration with the injection of hot brine solution. However, when the brine concentration is higher than the certain degree, the rate of instantaneous hydrate dissociation no longer continues to increases. During the hydrate dissociation, the rate of the liquid production is slightly higher than the rate of the solution injection, due to the water produced from the hydrate dissociation. Thermal efficiency and energy ratio for the hydrate production can be enhanced by injecting hot brine solution, and the enhance effectiveness is apparent with the injection of high brine concentration at the relative low temperature. After the EG injection, the hydrate dissociation in the vessel can be divided into four sections, that is the free gas producing section, EG diluting section, the hydrate dissociating section and the remnant gas producing section. The gas and water production rate were both unsteady during hydrate dissociation rate decrease continuously with time under the EG stimulation, while the EG injection rate kept nearly constant for the whole production process.
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