Abstract: The accurate prediction of circulating temperature is one of the important affecting factors of guaranteeing the
cementing operation safety and cementing quality. Especially for the deep well，the slurry is highly sensitive to temperature.
If the prediction difference of circulating temperature is negative 5 degrees lower，the pumpable time will sharply be reduced，
which will cause cementing trouble. If the prediction of circulating temperature is higher than actual temperature，the waiting
on cementing time will be prolonged，which will lead to abnormal retardation，that is to say the strength of the top of cement
column would not have developed until 10 days later，which delays the subsequent drilling operation. In order to guarantee
the cementing operation safety and cementing quality，a new two-dimension simulator has been proposed according to the
underground heat transfer construction process. The results show：Circulating drilling fluid several times and increasing the
pump rate will reduce circulating temperature，and the circulating maximal temperature in winter is lower than in summer，
especially for shallow well. So suitably reducing the design temperature in winter could not affect the pump safety. Temperature
coefficient in deep wells is higher than in shallow wells，and the circulating temperature is lower if the borehole size is bigger.

Key words: cementing, two-dimension model, circulating temperature, season, well profile