Abstract
Summary Cement slurries must be designed for the downhole conditions at the time of the cement job. Of all the factors that influence cement slurry design, bottomhole circulating temperature (BHCT) is potentially the most important element. Measurement of BHCT, the temperature within the wellbore that accounts for the cooling effects of fluid circulation, is not a standard field procedure for several reasons. A recently developed tool, however, simplifies temperature measurement under true circulating conditions. The new temperature recorder allows BHCT to be measured under normal operating conditions. The electronic memory recorder is dropped down the drillstring or lowered by wireline/slickline. When the tool is retrieved, the recorded data are transferred to a personal-computer disk. With this temperature information, the cement slurry can be designed with a high degree of confidence. This paper describes the temperature-recording memory gauge, its features, and its operation. Examples of data collected under field conditions illustrate its application.
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