垂直管不同黏度下油气水三相流压降规律研究

为研究垂直管不同粘度油气水三相流压降变化规律以及建立新的三相流压降预测计算方法,依托于中石油气举试验基地多相流试验室,对垂直上升管道中不同粘度油相下的油气水三相流动进行模拟。在固定油水比条件下,通过调整不同油相粘度、气液比、气液流量等参数进行油气水三相流试验,研究油相粘度对油气水三相管流压降变化影响规律。利用CFD软件参考试验工况模拟油气水三相流动,确定在不同粘度条件下气液两相分布情况,通过CFD软件模拟确定油水两相在充分混合后可视为单一非牛顿流体混合相。基于CFD模型结果,将三相流看作油水混合相与气相的两相流动,考虑粘度对摩阻系数的影响,根据非牛顿流体剪切特性建立了新的摩阻系数计算方法,基于M-B模型重新建立了新的压力计算方法。对比试验数据与计算结果,发现压降计算模型误差范围在15%内,满足工程实际需求,说明压降模型具有实用性。

Study on pressure drop law of oil gas water three-phase flow under different viscosity in vertical pipe

In order to study the variation law of pressure drop of oil, gas and water three-phase flow with different viscosity in vertical pipe and establish a new prediction and calculation method of pressure drop of three-phase flow, based on the multiphase flow Laboratory of PetroChina gas lift test base, the oil, gas and water three-phase flow in vertical rising pipe with different viscosity oil phase is simulated. Under the condition of fixed oil-water ratio, the oil-gas-water three-phase flow test is carried out by adjusting different parameters such as oil phase viscosity, gas-liquid ratio and gas-liquid flow to study the effect of oil phase viscosity on the pressure drop of oil-gas-water three-phase pipe flow. The oil-gas-water three-phase flow is simulated by CFD software with reference to the test conditions to determine the gas-liquid two-phase distribution under different viscosity conditions. It is determined by CFD software that the oil-water two-phase can be regarded as a single non-Newtonian fluid mixed phase after full mixing. Based on the results of CFD model, the three-phase flow is regarded as the two-phase flow of oil-water mixed phase and gas phase. Considering the influence of viscosity on friction coefficient, a new calculation method of friction coefficient is established according to the shear characteristics of non-Newtonian fluid, and a new pressure calculation method is re established based on M-B