An Improved Horner Method for Determination of Formation Temperature
- Key words
- formation temperature, Horner method, adjusted circulation time
- Conference
- World Geothermal Congress
- Year
- 2005
- Session
- 11. Reservoir Engineering
- Language
- English
- Paper number
- 1196
Full text
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Abstract
A new technique has been developed for determination of the formation temperature from bottom-hole temperature logs. The adjusted circulation time concept and a semi-analytical equation for the dimensionless temperature at the wall of an infinite long cylindrical source with a constant heat flow rate is used to obtain the working formula. It is shown that the transient shut-in temperature is a function of the mud circulation and shut-in time, formation temperature, thermal diffusivity of formations, and well radius. The sensitivity of the predicted values of formation temperature to the thermal diffusivity is shown. Two examples of calculations are presented.
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