Transient Heat Transfer Model for Deep HTHP Wellbore Under Multiple Heat Sources
In order to accurately analyze the effects of various heat source factors such as high-temperature and high-pressure(HTHP)physical property parameters of drilling fluid,drill string eccentricity,rotation,and rock breaking of bit on the annular temperature profile,a transient heat transfer model for deep HTHP wellbore was built based on the heat transfer mechanism and flow process in and around the wellbore.Then,the finite volume method was used to numerically solve the model,and the software Drillbench and the proposed model were com-pared and validated against the measured data.The results show that the model yields the results more fitted with the measured data.The consideration of multiple heat source factors makes the annular temperature closer to the true value of the wellbore,with a temperature difference of 8.43℃in the bottomhole annulus.When the changes in HTHP physical property parameters of drilling fluid are considered,the temperature of the lower annulus drops significantly with the well depth,and the temperature difference in the bottomhole annulus is 3.48℃.Compared to the drill string eccentricity,the rotation and the rock breaking of the bit have a more significant impact on the temperature in the annulus,with a temperature difference of 6.20℃and 6.56℃in the bottomhole annulus re-spectively.The research results provide theoretical guidance for the prediction and control of temperature in deep HTHP wellbores.
deep HTHP wellboresheat transfer in wellboredrill string eccentricityrotationrock break-ing of bit
万方数据
维普
