Table 6 Reference case input data

Reservoir

Surface thermal water system

    Depth

M

1200–1400

    Flowline length

m

200

    Temperature

°C

75

    Flowline inner diameter

m

0.23

    Static reservoir pressure

MPa

15.4

    Wall thickness

m

0.004

    Water salinity

g l⁻¹

200

    Insulation thickness

m

0.037

    Gas content

Sm³/m³

0.25

    Heat exchanger heat flux density

W m⁻² K⁻¹

900

    Methane content

Sm³/Sm³

0.88

    Pinch point

K

4

    Gas dissolution pressure

MPa

1.5

    Material

CS, SS

    Effective reservoir thickness

M

40

    Injection pump motor efficiency

–

0.90

    Permeability

m²

0.18 10^–12

    Injection pump isentropic efficiency

–

0.90

    Injection system efficiency

–

0.96

Wells: doublet with vertical production and deviated injection well

Total system: coupling with peak-load and redundancy-boiler

    Well depth

M

1400

    Surface system operating pressure

MPa

1.5

    Casing outside diameters

in

13 3/8, 9 5/8, 7

    Correction factors output to design

–

1.1 to 1.2

    Thermal conductivity casing

W m⁻¹ K⁻¹

50

    System availability

–

0.92

    Thermal conductivities cement/rock

W m⁻¹ K⁻¹

1.6/3

Completion

Base case cost and revenue estimates

    Production pump

in

10.25

    Thermal water mass flow rate

kg s⁻¹

42.5

    Pump motor efficiency

–

0.85

    Return temperature distribution grid

°C

35

    Pump isentropic efficiency

–

0.78

    Full load hours geothermal

h

6000

    Production system efficiency (converter, transformer, power transm.)

–

0.9126

    Power split geoth: peak load supplier

MW:MW

35:65

    Pump minimum submergence

MPa

1.5

    Work split Geoth: peak load supplier

GWh:GWh

80:20

    Thermal conductivity tubing

W m⁻¹ K⁻¹

50

    Heat price at distribution grid

cents/kWh

8

    Thermal conductivity annulus (gas)

W m⁻¹ K⁻¹

0.035

    Electricity purchase price

€/kWh

0.16

    Gas purchase price

€/kWh

0.04

    Lifetime

a

30