Tools and technologies developed in the E&P industry are all in place to drill and complete Eavor-Loops in a safe and efficient way. The shale gas development in North America has proven that large horizontal drilling campaigns can reduce drilling costs by 70 to 80% when scaled up. This makes Eavor-Loops a highly economic baseload source of Energy.
In 2019 Eavor build the Eavor-Lite demonstration facility, proving all aspects of the technology. The wells were multilateral drilled and intersected, the Rock-Pipe fluid has sealed permeable zones in the subsurface and the fluid is in circulation without pump support since 2019.
Eavor-Loops are placed in highly stable formation, by deeply evaluating geophysical subsurface data by an expert team of geoscientists. Since the laterals are sealed and no drilling is planned into structural faulted or fractured zones, there is no flow into the formation that causes an instability. By the way, that also eliminates the risk of induced seismicity.
The output of an Eavor-Loop highly depends on the temperature gradient, depth and thermal conductivity in the ground. The geoscientific team makes sure we have good data. The average output per Eavor-Loop can be between 15 and 20 MW thermal or 2 MW power. Since the Loops operate 24/7, independent from season or weather, the profitability is given and highly predictable.
Eavor-Loops are the only source of energy that fulfills all aspects of an energy source. It is scalable and can be implemented almost everywhere in the world, it can provide heat and power, it is highly predictable and provides baseload energy independent from weather or seasons. On top of that; it is renewable and 100% GHG-free.
The vertical part of a loop is protected from the surrounding formation and groundwaters with installed metal casing and concrete in the annulus, like in every conventional geothermal well. For the laterals we use our own patented Rock-Pipe fluid, sealing the well from the formation with an environmentally neutral chemical process.
The collection of the heat from the surface is highly predictable with subsurface data and thermodynamic modelling. With the control of the flow rate in the Loops, we can control the heat offtake from the subsurface. So operating the loops within our design parameters gives the Loops a lifetime of 100 years. We did prove this in our Eavor-Lite demonstration project that is running since 2019, where the output matches the original thermodynamic model.
Water is heated in the earth, collecting the heat during the flow of the horizontal loops. The hot fluid has a lower density and rises up to the surface. At the same time, colder and heavier water flows into the loop on the cold end. This creates a natural flow cycle.