Eaposys – Technology

Local, tailorable and fair energy, anywhere

Safe and Independent Geothermal Baseload Heat and Electricity

Geothermal tremendous untapped reserves

Our planet has a sun inside

+99% of Earth’s mass is at temperature above 1’000°C
Just a 3 km layer at surface is below 100°C

There is permanently enough energy right under our feet!

Advanced Geothermal Systems (AGS)

Unlike conventional hydrothermal or enhanced geothermal systems (EGS), AGS do not rely on producing geothermal brines from natural or engineered subsurface reservoirs. Instead, AGS circulate a clean working fluid through sealed boreholes, slowly recovering the ambient heat for the decades to come.

HOW IT WORKS

1. Drill deep

Down to 3-5 km where ambient temperature exceeds 100°C

2. Connect wells

Create closed underground loops from the service well

3. Self-circulation (thermosiphon)

Cold water flows down, heats up, and circulate naturally, without pumping

4. Collect heat at surface

Heated water rises at the well head supplying industrial heat

Predictable: Closed-loop geothermal systems are largely independent of geology and do not rely on difficult to manage reservoir properties. AGS are dimensioned to precisely match local energy needs.

NO PUMPING is REQUIRED, thanks to naturally occurring THERMOSIPHON effect. Once the installation is started, the working fluid circulates by itself in the loop with no additional power needed for operations.

No fracking or reservoir stimulation and associated risk of induced seismicity, better social acceptance and urban deployment possibility for short-travel higher-efficiency energy supply.

No corrosive brines, minimal water use and treatment, reliable, long-term energy infrastructures with lower maintenance requirements, using working fluids with well maintenance properties.

Our AGS Patented Design

EAPOSYS AGS is a modular closed-loop geothermal system designed for staged deployment. Built on over eight years of research and patented innovations, it has been developed alongside world-class well engineers and leading oil and gas service companies, and is grounded in proven drilling and completion technologies.

At the core of the EAPOSYS technology is a patented service well enabling incremental, butterfly-shaped deployment geometries.

Key Benefits

Cost Optimization

✔ Single-rig drilling

✔ Early revenues

Engineering Advantage

✔ Incremental drilling

✔ Simplified hydraulics

Energy Efficiency

✔ Butterfly-shaped heat collection

✔ No risk of thermal shortcut

EAPOSYS Patented Service Well USP

Incremental deployment

Shorter time to revenue: the system can start operation as soon as a first heat collection loop connecting the injection and production wells is completed
Reduced drilling risk: shorter lateral length with side-track possibilities
Easier maintenance: Heat collection loops can be re-accessed individually from the service well
The full installation can be drilled with a single rig, minimizing expensive non-productive time of the second rig

Butterfly-shaped geometry

Many possible geometries for optimal deployment in various geological context
Horizontal deployment of the heat collection loops maximizing recovery of natural Earth heat flow
Lower sensitivity to connectivity issues with vertical stacking of heat collection loops

Minimal

Incremental

Optimized

EAPOSIM: Our AGS Simulation Software

EAPOSIM consists of an initial software kernel enabling rapid calculation of AGS installations energy output.

This initial analytical calculation module allows the treatment of multiple wellbore sections along any pre-defined polygonal line geometries and parameters in a vertically linear geothermal gradient field. The module is developed by Prof Pierre Perrochet at the Center of Hydrogeology and Geothermics (CHYN) of the University of Neuchâtel.

Energy output results over time as a function of applied flow rate and injection temperature are available at the click, allowing for the rapid development of various usage scenarios and their associated configurations.

EAPOSIM module is built on:

Physics based 3D modeling tools: A platform consisting of parallelized FORTRAN90 software in a computing environment with a set of parallel multiprocessor nodes. The model implements sets of polygonal lines with mutual thermal influences, along which a 3D source term approach is coupled to a 1D advective transport process in the conduit network. Hence, the effects of proximity between different wellbore sections, such as the effect of the distance between the two branches of a V-shaped loop on the outlet temperature, or the proximity of the injection (cold) and extraction (hot) can be taken into account.
Maple tool: Analytical resolution of 1D transport equations coupled to 2D-radial thermal exchanges, accounting for mutual influence of parallel conduits and loops.
Excel model: User friendly tool replicating (1) and (2) instantaneously, with an accuracy of a few tenths of degrees (for configurations with no thermal influences), compared with the Physics based 3D modelling approach mentioned above.

EAPOSIM: E.AGS simulation for 1, 2 or 3 V levels, 1 V level cumulating 2×2 km multilateral, 4 km depth, geothermal gradient 30 or 45°C/km, standard rock and fluid parameters.