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\frac{1}{ r_{ti} \, U} = \frac{1}{r_{ci} \, U_{ci}} + \frac{1}{r_{ci} \, U_c} + \frac{1}{r_c \, U_{cem}} |
where
| outer radius of the casing | ||||
| inner radius of the casing | ||||
| casing wall thickness | ||||
| wellbore radius by drilling bit | ||||
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| Casing Wall Conductive Heat Transfer Coefficient | ||||
| Cement Conductive Heat Transfer Coefficient | ||||
| thermal conductivity of fluid moving through the tubing | ||||
| thermal conductivity of casing material | ||||
| thermal conductivity of cement |
The equation
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\frac{1}{ r_{ti} \, U} = \frac{2}{\lambda \, {\rm Nu}_{ci}} + \frac{1}{\lambda_c} \ln \frac{r_c}{r_{ci}} + \frac{1}{\lambda_{cem}} \ln \frac{r_w}{r_c} |
See also
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Physics / Thermodynamics / Heat Transfer / Heat Transfer Coefficient (HTC) / Heat Transfer Coefficient (HTC) @model
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