Geothermal - Wellhead temperature drop
Geothermal - Wellhead temperature drop
(OP)
Hi,
I need help for an economic evaluation of a geothermal problem. I'd like to know if, in your experience, the temperature of water at wellhead point could be considered close to the bottom temperature of the well (or with difference < 1 °C). The well is 1500-2000 m, the bottom temperature is about 80-90°C, pressure 3-4 bar.
Thanks
I need help for an economic evaluation of a geothermal problem. I'd like to know if, in your experience, the temperature of water at wellhead point could be considered close to the bottom temperature of the well (or with difference < 1 °C). The well is 1500-2000 m, the bottom temperature is about 80-90°C, pressure 3-4 bar.
Thanks





RE: Geothermal - Wellhead temperature drop
After a few hours of flow, the water temp at bottom will have heated the pipe, heated the rock around the pipe, and heated the insulation and grout topside, right? So, there will be very little added loss to that "static" loss of heat energy of the entering water through the pipe to the surrounding rock.
But 2000 meters of pipe closely surrounded by rock with no insulation between pipe and rock will reduce water temperature at top of pipe measureably. The cold rock will approach a near-infinite heat sink, so you will always lose some heat.
RE: Geothermal - Wellhead temperature drop
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P.E. Metallurgy, Plymouth Tube
RE: Geothermal - Wellhead temperature drop
The production pipe is inside a concentric casing system. I need only simply model for MS Excel to do a rough approximation of the temperature drop between bottom-well and wellhead and I thought to use a multilayer cylinder-conduction model.
RE: Geothermal - Wellhead temperature drop
From steam tables. A 2000m and 80c the h = 350.82 kJ/kg, At 3 bar that h gives a temperature closer to 85c.