Bottom Hole Temperature (BHT)
Definition - What does Bottom Hole Temperature (BHT) mean?
Bottom Hole Temperature (BHT), also known as downhole temperature is the temperature of a wellbore calculated or measured at a point of interest in the extraction process. During log interpretation, bottom hole temperature is usually recorded as the maximum temperature during a logging run. At other times it is preferably conducted during the last of series of runs in the extraction process.
Petropedia explains Bottom Hole Temperature (BHT)
Bottom hole temperature is mainly used in the interpretation of logs. When measuring the bottom hole temperature of a wellbore, the correct temperature is usually calculated by assuming a certain temperature gradient. The BHT lies between the bottom hole circulating temperature (BHCT) and the bottom hole static temperature (BHST).
In order to calculate the borehole temperature the following formula has to be used:
GD = (BHT-ST)/TD
GD represents geothermal gradient
BHT represents bottom hole temperature
ST represents surface temperatureTD represents the Total Depth of the borehole.