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LaTeX Math Inline
bodyt

Astronomic time

LaTeX Math Inline
body\delta T_A

Annual average surface temperature variation based on weather reports

LaTeX Math Inline
bodyl

wellbore trajectory Measured Depth with reference to Earth's surface (

LaTeX Math Inline
bodyl=0
)

LaTeX Math Inline
bodyA_T

Period of annual temperature variation cycle:

LaTeX Math Inline
body--uriencoded--A_T = 1 \, %7B\rm year%7D

LaTeX Math Inline
bodyz(l)

Wellbore trajectory. True Vertical Depth Sub-Sea (TVDss)

LaTeX Math Inline
body\delta t_A

Time moment of annual highest temperature with respect to January 1

LaTeX Math Inline
bodyj_z

True vertical component of regional Earth's heat flux (usually 

LaTeX Math Inline
body--uriencoded--j_z = 25 \div 55 \ mW/m%5e2
)

LaTeX Math Inline
body\delta T_D

Daily average surface temperature variation based on weather reports

LaTeX Math Inline
bodyT_s

Annual average surface temperature based on weather reports

LaTeX Math Inline
bodyD_T

Period of daily temperature variation cycle:

LaTeX Math Inline
body--uriencoded--A_D = 1 \, %7B\rm day%7D

LaTeX Math Inline
bodya_e

Average Thermal diffusivity of the soil between Earth's surface and neutral layer

LaTeX Math Inline
body\delta t_D

Time moment of daily highest temperature with respect to Midnight 00:00

LaTeX Math Inline
body\lambda_r(l)

Rock Thermal Conductivity along-hole profile

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Neutral Layer


LaTeX Math Block
anchorz_N
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z_N = z_s + H_N



LaTeX Math Block
anchorH_N
alignmentleft
H_N = \sqrt{\frac{a_e \, \deltaA_T }{\pi}} \, \ln \frac{\delta T_A }{\delta T_{cut} }


Below Neutral Temperature LayerAbove Neutral Temperature Layer


LaTeX Math Block
anchorT_g
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T_g(l) = T_n + \int_{z_n}^z G_T(z) dz



LaTeX Math Block
anchorT_z
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T(t, z) = T_s + \frac{j_z}{\lambda_e} (z-z_s) + T_Y(t, z) + T_D(t, z)



LaTeX Math Block
anchorG_T
alignmentleft
G_T(z) =\frac{d T_g}{d z}= \frac{j_z}{\lambda_r}



LaTeX Math Block
anchorT_z
alignmentleft
T_A(t,z) = \delta T_A \, \exp \left[ \, {(z_s-z}) \sqrt{\frac{\pi}{a_e \, A_T}} \, \right] \, \cos \left[  \, 2 \pi \frac{t - \delta t_A}{A_T} + (z_s -z) \sqrt {\frac{\pi}{a_e \, A_T}} \, \right]




LaTeX Math Block
anchorT_z
alignmentleft
T_D(t,z) = \delta T_D \, \exp \left[ \, {(z_s-z}) \sqrt{\frac{\pi}{a_e \, AD_DT}} \, \right] \, \cos \left[  \, 2 \pi \frac{t - \delta t_D}{D_T} + (z_s -z) \sqrt {\frac{\pi}{a_e \, D_T}} \, \right]


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