Temperqture logging began around 1846 when William Thomson (Lord Kelvin) made measurements of temperature in water wells in England. His first technical paper on the subject was "Age of the Earth and its Limitations as Determined by the Distribution and Measurement of Heat within It". Kelvin's calculated age was 20 - 40 million years. Since radioactivity had not been discovered yet, Kelvin was unaware of the heat generated internally from this source, so he can be excused for a 100-fold error in his estimate of the Earth's age. Controversy, debate, and a slew of additional papers ensued for another 50 years.
The first wireline temperature log was run in 1933. Many modern logging tools have a temperature sensor built-in, so a separate device is no longer needed.
Temperature logs are used to establish local and regional formation temperature, temperature gradients in oil, gas, and geothermal wells, and gas inflow in open and cased hole, Other applications are (or were) location of cement top after setting casing, assessment of perforation efficiency in production and injection wells, as well as detection of crossflows and gas flows behind casing.
The temperature log is an integral part of all production logging operations as it is essential in assessing multi-phase flow rates, especially in deviated and horizontal wells..
Temperature logs have been widely used to asseaa completions in producing and injection wells. Here are two examples.
The "forgotten" log, the temperature survey in open hole, might be useful if some gas has evolved into the wellbore prior to logging. There is a temperature sensor on most modern logging tool strings - just ask for it to be displayed.
Temperature lofs in geothernal wells are essential for both exploration and development.
the “good old days” before the invention of sonic
logs, there was no genuine cement integrity log. However, the
location of the cement top was often required, either to satisfy
regulations or for general knowledge. Since cement gives off heat
as it cures, the temperature log was used to provide evidence
that the well was actually cemented to a level that met expectations.
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