Well depth

1000 m

Pore water heat conductivity coefficient

0.5 W/(m∙K)

Geothermal gradient

3˚C/100 m

Slurry density

1300 kg/m3

Rock density

2700 kg/m3

Specific heat capacity of slurry

2800 J/(kg∙K)

Specific heat capacity of rock

1400 J/(kg∙K)

Surface heat transfer coefficient

200 W/(m3∙K)

Rock heat conductivity coefficient

10 W/(m∙K)

Slurry heat conductivity coefficient

1 W/(m∙K)

Porosity

0.1

Drill pipe heat conductivity coefficient

17 W/(m∙K)

Permeability

1e-14(D)

Drill pipe density

7800 kg/m3

Internal friction angle

30˚

Drill pipe atmospheric heat capacity

460 J/(kg∙K)

Poisson’s ratio

0.3

Drill bit density

3200 kg/m3

Biot coefficient

1

Drill bit heat conductivity coefficient

1500 W/(m∙K)

Pore water density

1000 kg/m3

Drill bit atmospheric heat capacity

400 J/(kg∙K)

Pore water specific heat capacity

4200 J/(kg∙K)

Heat transfer coefficient

200 W/(m2∙K)