During cementing operation it is important to have a good control of the setting time. The setting time is strongly affected by the wellbore temperature. So circulating temperature is one of the most important parameters for the design of cementing operations.

In order to better control this parameter, measurements were performed on a deep well in cased hole.

Temperature were measured at different depths on a deep vertical well with a 7" tie back casing in hole before and during mud circulation, in order to accurately estimate the temperature profile in the well. Very few data have been published in the literature with casing in hole.

The circulating measured temperatures are compared with calculated temperatures by means two computer programs, developed by two different Companies.

It is shown the good agreement for each depth between the field measurements and the calculated results. This field case can be used as a base for the validation of the other temperature computer programs.

A description of the analytical model of the computer programs is presented in the paper.

The computer program calculates the temperature profile of the fluid in the casing, in the annulus and in the formation for each measured depth of well during circulation.

The heat exchange between the casing, the annulus and the formation is described by means of integration of the equations of conservation of energy, applied to a control volume inside the casing, the annulus and the formation.

Some justified assumptions are made to obtain the desired partial differential equations...,

Some correct boundary and initial conditions are defined for the solution of the differential equations of energy.

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