Abstract

One of the most useful log in cased hole logging is Temperature log. A temperature log is interpreted by looking for anomalies, or departures, from the Reference Gradient. This reference might be the geothermal gradient, or a Log recorded with the well under shut-in condition. Most anomalies are related to the entry of fluids into the borehole or fluid exit into the Formation. Since the temperature is affected by material outside the casing, this log is sensitive to not only the Borehole fluid but also the fluid movement behind casing. Temperature logs have many applications, with the most common being to identify zones producing or taking Fluid, to evaluate a cement or Hydraulic Fracture Treatment, and to locate lost circulation zones and casing leaks. Since temperature takes time to dissipate, a temperature log tends to reflect the behaviour of a well over a longer time period than other measurements