Motivation
Outputs
T_e(t, l) | along-hole geothermal temperature profile |
Inputs
t | Astronomic time | T_A | Annual average surface temperature variation based on weather reports |
l | wellbore trajectory Measured Depth with reference to Earth's surface ( l=0) | A_T | Period of annual temperature variation cycle: A_T = 1 \, {\rm year} |
z(l) | Wellbore trajectory. True Vertical Depth Sub-Sea (TVDss) | \delta t_A | Time moment of annual highest temperature with respect to January 1 |
j_z | True vertical component of regional Earth's heat flux (usually j_z = 25 \div 55 \ mW/m^2) | T_D | Daily average surface temperature variation based on weather reports |
T_s | Annual average surface temperature based on weather reports | D_T | Period of daily temperature variation cycle: A_D = 1 \, {\rm day} |
a_e | Average Thermal diffusivity of the soil between Earth's surface and neutral layer | \delta t_D | Time moment of daily highest temperature with respect to Midnight 00:00 |
\lambda_r(l) | Rock Thermal Conductivity along-hole profile |
Assumptions
Equations
Neutral Layer | |||||
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Below Neutral Temperature Layer | Above Neutral Temperature Layer | ||||
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where
z_s = z(l=0) |
See Also
Geology / Geothermal Temperature Profile
Geothermal Temperature Field @model
References
Kasuda, T., and Archenbach, P.R. "Earth Temperature and Thermal Diffusivity at Selected Stations in the United States", ASHRAE Transactions, Vol. 71, Part 1, 1965.