| At the same time as human rapid development,the energy available for human use is gradually reduced,because the environmental problems caused by the use of a large number of traditional fossil energy also hinder human progress.Therefore,the search for new energy sources with cleanliness,high efficiency and large reserves has become a necessary condition for people to continue to develop.The discovery of natural gas hydrates in recent years has aroused great concern.It has the advantages of abundant reserves,low combustion pollution and small volume of energy storage.In this paper,the numerical simulation method is used to simulate the natural gas hydrate mining process,and the influencing factors in the mining process are analyzed.In this paper,the FLUENT software is used to simulate the natural gas hydrate steam injection method in two aspects: 1.In terms of initial conditions of natural gas hydrate reservoir,this paper simulates different initial permeability and hydrate saturation for mining.The impact of the process.In terms of steam injection parameter selection,this paper simulates the effects of different steam injection temperatures and speeds on the mining process.The pressure distribution and the variation of the three-phase distribution during the mining process are analyzed.In the process of simulation setup,based on the original energy and thermal equations,the hydrate kinetic equation is added,and the phase change,heat transfer and reaction in the hydrate reaction process are controlled by the user-defined function.A variety of problems,such as heat,make the decomposition process of the simulation more precise.According to the analysis after the simulation,when the hydrate saturation is high,it is suitable to select the combined mining method of reducing pressure and reheating first;when the hydrate permeability is large,it is suitable to use the steam injection method;the higher the steam injection temperature,the hydrate decomposition The faster the steam injection rate,the faster the hydrate decomposition rate. |
