深水井筒两相流温度分布计算方法研究

Research on Temperature Distribution Calculation Model for Two-Phase Flow in Deepwater Wellbore

气液两相流广泛存在于深水油气开采过程中,由于水下井口装置的结构限制,只能测得油管流体和生产环空流体的井口温度。本文考虑气液两相流体在生产过程的传热机理,基于质量,动量和能量守恒方程,通过拟稳态法建立深水井筒两相流温度分布计算模型。计算结果表明,油管流体及环空流体温度随着井深的降低而降低,最外层环空温度变化最大;油管井口温度随着管内气体的表观速度增加而降低,随着液体的表观速度增加而增加。气液流速比越低,油管流体井口温度越高,气液流速比越高,井口温度越低;环空温度随着气液流速比的增加而降低。

Gas-liquid two phase flow widely exists in deep-water oil and gas production process.As the structural limitation of subsea wellhead,only the wellhead temperature of tubing fluid and annular fluid can be measured.In this paper,considering the heat transfer mechanism of gas-liquid two phase flow in the production process,the temperature distribution model of deep-water wellbore two phase flow is established by semi-steady state method based on the mass,momentum and energy conservation equations.The results show that the temperature of the tubing fluid and the annular fluid decreases with decreasing of the depth for the well,and the outer annulus temperature changes,and the wellhead temperature of the tubing decreases with increasing of the apparent velocity of the gas in the tube and increases with increasing of the apparent velocity of the liquid.The lower ratio of the gas and liquid velocity,the higher wellhead temperature of the tubing fluid,and the higher ratio of the gas and liquid velocity,the lower the wellhead temperature of the tubing fluid.Annular temperature decreases with the increasing the velocity ratio of gas and liquid.