Abstract: By quoting cement slurry’s hydration heat data to establish a mathematical model, dividing wellbore’s annular formation with certain thickness into axial symmetric trigonal ring ele-ments and applying the finite element theory and time differen-tial method to the heat conduction problem, a software has been
programmed to calculate and predict the temperature during hy-dration and solidification of cement slurry. Some conclusions have been obtained by analyzing the results of calculation. The changing of temperature can be divided into three phases during the setting of the slurry. And the primary factors of affecting temperature are the thermal characteristics of formation rock,formation temperature, initial temperature of the slurry and the
amount of cement slurry per unit volume. This method can be applied to estimate the temperature during solidification of ce-ment slurry and observe the effect of temperature changing on the property of casing during and after the slurry setting.

Key words: primary cementing, cement, temperature, fi-nite element method, hydration heat