Dynamic Characteristics of Thermal Field Coupled with Gas-Water Two Phase Flow in High-Pressure Tight Gas Wellbores
Dynamic temperature distributions of gas-water two phase flow in wellbores are essential for the continuous,stable and safe mining and intelligent metering output of tight gas wells.The thermodynamics of enthalpy,Joule-Thomson coefficient,temperature gradient and heat transfer rate and dynamics of two-phase flow were unified under coupling heat transfer between wellbore fluid,oil tubing,annulus,casing,cement sheath and rock layer.A methodology on predicting temperature field distribution was proposed for gas-water two phase flow in tight gas wellbores.The dynamic variations of wellbore temperature with production,tubing diameter,layer tem-perature,thermal conductivity were analyzed more comprehensively and accurately by numerical simulation and well site testing.The re-sults show that the amount of heat carried per unit mass of fluid in wellbores increases with the enhanced flow rates and layer tempera-tures and the reduced tubing inner diameters and geothermal gradients.And it is beneficial for wellbore insulation and effectively inhibits hydrate formation,and bottomhole temperature plays an important role in deep wells.The thermal conductivities of cement sheath,tub-ing,annulus and casing can affect the total thermal resistance,relaxation distance,dimensionless time and temperature distribution of the wellbore heat transfer system.Heat transfer coefficient has less effect on wellbore temperature compared to production and layer tempera-ture.
intelligent metering outputtight gas wellgas-water two phase flowthermal field couplingtemperature field distri-bution
NETL
NSTL
万方数据
