Abstract
During the drilling process, the variations of the thermophysical properties of drilling fluid have an important effect on the wellbore temperature distribution. As the wellbore temperature changes, the thermophysical properties of drilling fluid change. In this work, the effect of the variations of density, thermal conductivity, specific heat capacity, and viscosity of drilling fluid with temperature on wellbore temperature calcilation during drilling was studied using water as drilling fluid, and the extent to which each thermophysical property affected the calculation of the wellbore temperature distribution was compared. The calculation results show that the variations of density and thermal conductivity of drilling fluid with temperature have a little effect on wellbore temperature calcilation, and the variation of specific heat capacity of drilling fluid with temperature has negligible effect on wellbore temperature calcilation, while the variation of viscosity of drilling fluid with temperature has significant effect on wellbore temperature calcilation. Therefore, whether to consider the variations of thermophysical properties of drilling fluid with temperature can have a certain effect on the calculation of wellbore temperature distribution during drilling. The thermophysical property of the drilling fluid that is very sensitive to temperature variation should be fully considered during the wellbore temperature distribution calculation.
Published Version
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