Research On The Separation Mechanism And Working Performance Of Gas-water Spiral Separator

This paper presents application of downhole gas-liquid separation technology can be output of water directly into the same well water recharge in gas well production.gas-liquid spiral separator applied underground reinjection technology can be used to solve the screw pump problem of low efficiency in the high concentration gas well ,achieved downhole gas-liquid separation,produced water reinjection and gas production ,had good economic benefits and environmental protection.The article combines with the downhole condition of Shenyan Oil Production Plant,designs the gas-water spiral separator used for downhole reinjection technology,analyzes the working principle of the gas-liquid spiral separator and detailed studies the impact of the separation mechanism of the structural parameters and operating parameters.Numerical simulation was carried out by using CFD software FLUENT with Euler-Euler method. The simulation of interior flow field of the gas-liquid spiral separator is performed by means of RNG k-εturbulent model, control volume method and SIMPLE arithmetic method. The rules of velocity, pressure distribution and gas-liquid of two-phase flow distribution inside fluid are gained.Numerical simulation was carried out the gas-liquid spiral separator of different structural parameters,detailed studies the impact : the changes of structural parameters of the gas-liquid spiral separator of pressure drop and separation efficiency. The optimum structure of screw - type gas - liquid separator is pitch 25mm, number of spiral 5 by integrating the factors of energy consumption and separation efficiency ,the separation efficiency can reach to 95.28%. Then we find the distribution of flow field in separator by studying cross - section velocity of different displacement and gas-liquid ratio through the structure. Compareing the experimental result with the numerical simulation, there is slight difference, but the trend is the same. We verify that the establishment of the mathematical model and Numerical Simulation Method for the correctness and feasibility.