Geothermal Doublet Lab: Thermal Breakthrough, Streamtubes…

What is a Geothermal Doublet?

A geothermal doublet consists of two wells: an injection well and a production well. These wells are used to extract heat from the Earth’s subsurface by circulating a working fluid through the system.

The process involves injecting cold water into one well, which absorbs heat from the hot underground reservoir before being pumped back up through the second well as warm water.

Thermal Breakthrough and Streamtubes

Thermal breakthrough occurs when the injected fluid first encounters heated rock in the subsurface. This marks the beginning of heat transfer from the reservoir to the working fluid.

Streamtubes are visual representations of fluid flow paths within the geothermal system, tracing the movement of the cold-water front as it interacts with the hot underground environment.

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Organic Rankine Cycle (ORC) Power Generation

The Organic Rankine Cycle (ORC) is a thermodynamic cycle used to convert thermal energy into mechanical work, which can then be converted into electrical power. In the context of geothermal systems, ORC cycles are particularly useful for utilizing lower-temperature heat sources.

In this simulation, you can observe how the temperature and pressure changes in the working fluid affect the efficiency of the ORC cycle, leading to variations in generated electric power.

Pump Cost Analysis

The cost of pumping is a critical factor in geothermal doublet operations. In this simulation, you can explore how different well spacings and fluid flow rates impact the energy required for pumping cold water into the injection well.

By analyzing pump costs, you gain insights into the economic viability of geothermal projects based on their operational parameters.

Frequently asked questions

What is thermal breakthrough in a geothermal doublet?

Thermal breakthrough refers to the moment when cold water injected into an underground reservoir first encounters heated rock, initiating the heat transfer process that makes the system functional.

How does the ORC cycle work in geothermal systems?

In a geothermal ORC cycle, the working fluid (such as propane or isobutane) absorbs heat from the hot water and vaporizes. The resulting steam drives a turbine, which generates electricity before condensing back into a liquid to be recycled.

Why are streamtubes important in geothermal simulations?

Streamtubes help visualize fluid flow paths within the geothermal system, providing insights into how heat is transferred and how fluids move through the reservoir, which is crucial for optimizing well placement and operation.

How does pump cost affect the economic viability of a geothermal project?

High pumping costs can significantly reduce the profitability of a geothermal project. By analyzing these costs in simulations, engineers can identify more efficient designs that minimize energy consumption and maximize output.

Try it live

Everything above runs in your browser — open Geothermal Doublet Lab: Thermal Breakthrough, Streamtubes, ORC Power and Pump Cost and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Geothermal Doublet Lab: Thermal Breakthrough, Streamtubes, ORC Power and Pump Cost simulation