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Table 4 Geometric parameters and material properties used in the simulation of the counterflow heat exchange model

From: Temperature log simulations in high-enthalpy boreholes

Property

Unit

Value

Formation temperature at the surface

°C

7

The geothermal gradient

°C/m

0.1

Casing thermal conductivity

W/(m  °C)

50

Cement thermal conductivity

W/(m  °C)

1.2

Formation rock density

kg/m3

3000

Formation thermal conductivity

W/(m  °C)

1.5

Formation specific heat capacity

J/(kg  °C)

840

Well depth

m

4600

Inside radius of the drill pipe

m

0.0352

The outside radius of the drill pipe

m

0.0445

Inside radius of the casing

m

0.0797

The outside radius of the casing

m

0.089

The radius of the wellbore/formation interface

m

0.1

Water production rate

kg/s

15

Water specific heat capacity

J/(kg  °C)

4194

Water density

kg/m3

1000

Water viscosity

Pa∙s

1e−3

Water thermal conductivity

W/(m  °C)

0.6