Horner Formation Temperature from Bottom-Hole Temperature Formula
Horner Formation Temperature from Bottom-Hole Temperature calculates corrected static formation temperature for thermal gradients workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (T_log, C_H, t_c, delta_t) are known and the assumptions behind the cited thermal gradients relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, T_true equals 190.881361 degF.
180
-20
5
2
Inputs
T_log
degFMeasured Logging Temperature
C_H
degF/log-cycleHorner Plot Slope for Base-10 Log
t_c
hrMud Circulation Time Before Shut-In
delta_t
hrTime Since Circulation Stopped
Outputs
T_true
Corrected Static Formation Temperature
H_horner
Dimensionless Horner Time Ratio
T_log
Measured Logging Temperature
C_H
Horner Plot Slope for Base-10 Log
t_c
Mud Circulation Time Before Shut-In
delta_t
Time Since Circulation Stopped
Source and review
reviewedAPT International glossary. Borehole temperature model calibration, Horner-type corrections.
Source