Calculation of wellbore temperature in offshore drilling

The wellbore temperature must be calculated accurately in order to solve many problems in offshore drilling. According to principle of conversation of energy, the temperature control equations are established including annulus, drill pipe and formation temperature equations and definite conditions of these equations were given. The results showed that wellbore temperature could be affected by drilling fluid density and circulation volume, and wellbore temperature was getting close to ambient temperature when drilling fluid density became heavier or circulation volume became lower.