Abstract One of the most important parameters to obtain for the appropiate cement slurry is the bottom-hole temperature which will determine the type and amount of additives needed in the slurry to achieve the required properties. At present, a new technique has been developed to determine the bottom hole circulating temperature based on data gathered with electronical tools. Field application has produced very reliable data that one can use to calculate the required BHCT that a cement slurry will encounter. With the application of this technology the slurry designs have been improved, and the costs have been reduced to about 27% for the production liners and 38% for the production casings.