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盐类矿床水溶开采管柱内流体的输运过程是一个吸热放热、流体运移和溶质扩散的复杂的热-流-传质(THC)耦合作用过程,在复杂的耦合作用下,管柱内流体的各组分易发生物理、化学变化,形成结晶。为了研究盐类矿床水溶开采管柱内流体结晶的机理,以多场耦合理论为基础,采用FLUENT数值模拟软件,对管柱内流体进行THC耦合作用的研究,得到管柱内流体的温度场、速度场以及不同浓度条件下的浓度场。结果表明,当井底流体入口速度为0.7 m/s、温度55℃,地面流体温度30℃的条件下,对于盐类矿床水溶开采管柱内流体,存在一个井底浓度临界值,当井底浓度大于该值时,流体在上移的过程中就会形成结晶,同时对管柱内流体的最大浓度值进行了拟合。模拟结果对工程实践具有一定的引领作用和应用价值。
The transport process of the fluid in the water column of the salt deposit is a complicated thermo-fluid-mass transfer (THC) coupling process of endothermic heat release, fluid transport and solute diffusion. Under complicated coupling action, The various components of the fluid in the column are prone to physical and chemical changes to form crystals. In order to study the mechanism of fluid crystallization in the water column of the salt deposit, based on the theory of multi-field coupling, the FLUENT numerical simulation software was used to study the THC coupling effect of the fluid in the column. The temperature field, Velocity field and concentration field under different concentration conditions. The results show that there is a critical value of bottom hole concentration for the fluid within the pipeline when the bottom hole fluid inlet velocity is 0.7 m / s, the temperature is 55 ℃ and the surface fluid temperature is 30 ℃. When the well bottom When the concentration is higher than this value, the fluid will form crystals during the upward movement and at the same time, the maximum concentration of the fluid in the column is fitted. The simulation results have certain leading role and application value to engineering practice.