Determination of Formation Temperatures from Temperature Logs in Deep Boreholes: Comparison of Three Methods

Here we should note that even for a continuous mud circulation process the wellbore temperature is dependent on the current well depth and other factors. The term “effective fl uid temperature” is used to describe the temperature disturbance caused to formations while drilling. In their classical paper, Lachenbruch and Brewer (1959)

have shown that the wellbore shut-in temperature mainly depends on the amount of thermal energy transferred to (or from) formations.