高含水采出液T形管分离器的流场数值模拟

传统的油田集输工艺损耗能量大,运行成本高.鉴于此,基于Fluent数值模拟软件,采用RNG k-ε湍流模型和欧拉多相流模型对T形管分离器的流场特性以及油水分离过程展开研究.研究结果表明:油水两相速度分布规律基本相同,在主管中沿流动方向速度逐渐降低,分支管中速度最大,水相在主管顶部区域速度较小,在汇管中上述分布趋势更加明...

Numerical Simulation of Flow Field in T-junction Separator of Produced Liquid with High Water Content

T-junction separator has the characteristics of simple structure,no moving parts,easy design and installation,less maintenance,low operating cost,low energy consumption and small footprint.It has a wide range of application prospects in the filed of oil-water pre-separation.Based on the Fluent numerical simulation software,the RNG k-εturbulence model and the Euler multiphase flow model are used to study the flow field characteristics of the T-junction separator and the oil-water separation process.The research results show that:the oil-water two-phase velocity distribution is basically the same.The velocity gradually decreases along the flow direction in the main pipe.The velocity is the highest in the branch pipe.The water phase velocity is smaller in the top area of the main pipe and even smaller in the manifold.The turbulence is violent at the junction of the branch pipe and the main pipe,the junction of the branch pipe and the manifold,and the upstream of the manifold,where oil and water are strongly mixed.The inlet flow rate has a greater impact on the oil-water separation process.Higher flow rate results in shorter residence time of the fluid,and make it more difficult to recover to stratified flow after split flow disturbance.In addition,greater flow rate leads to enhanced oil-water shearing effect,and the oil droplets are more uniformly dispersed,resulting in more oil phase carried in the mixed layer.So the optimal flow rate needs to be determined during operation.As the oil volume fraction increases,the thickness of the mixed layer increases.The separation efficiency depends on the relative value of the water phase flow ratio and the oil phase flow ratio in the manifold.The final separation efficiency shows a slow increase at first and then a gradual decrease.When the split ratio is low,the manifold mainly flows out of the bottom water,and the separation efficiency is low.As the split ratio increases,the flow of the manifold increases,and the disturbance between oil and water increases.The fluid flowing through the manifold carries part of the mixed layer fluid and separation effect is significantly improved.However,when the split ratio continues to increase,all the mixed layer may flow into the manifold,and the oil layer may begin to flow into the manifold.In this scenario,the separation efficiency decreases linearly with the increase of the split ratio.Based on the research results,the optimal operating parameters are:the inlet flow velocity is 0.10~0.30 m/s,the inlet oil volume fraction is 5%~9%,and the split ratio is 0.5~0.7.The study provides new ideas for oil-water separation.