Haute-Sorne, Switzerland

DESTRESS stopped its research activities in Haute-Sorne in 2018.

The demonstration site in Bedretto, Switzerland, serves as a substitute.

The Haute-Sorne Project planned to drill in 2017 (GVL-1) the first of a 2-well geothermal doublet connected through an EGS. Water was intended to be circulated between the two wells, in a closed-loop system used for power generation. GVL-1 wanted to prove the feasibility of the Geo Energie Suisse downhole heat exchanger concept.

GVL-1 was planned to be drilled to a final vertical depth of 5 000 m. The final bottom hole static temperature (BHST) must be a minimum of 170°C. The well should have been drilled vertically until the top of the granite basement would have been reached and steered to intersect a maximum number of natural fissures and deviated to 55° from vertical.

The injection/production drain was not planned to be cased. The open hole drained should have been sectioned with a completion string using water swelling elastomer and slickline operated mechanical sleeves. The intended completion design would have called for 30 individual sections spread over a 1 500 m long drain. Each section should have been stimulated independently by injecting defined volumes of fresh water, according to a pumping sequence. An extensive seismic monitoring programme was planned, that would have taken place before, during and after the drilling, completion and stimulation operations.

The tense in above text has been adapted to reflect the originally intended procedure. None of the activities described have been carried out yet.

Operator operator-logo

Geo Energie Suisse

Work Package No



Haute-Sorne, France

Construction Year

Start drilling in 2017

Foreseen Stimulation Techniques stimulation-logo

Multi-stage shear stimulation

Type of Use

Provision of electricity

Soil Condition


Production Horizon

not known yet

Upper Depth (m)


Thickness (m)


T (°C)


Salinity (g/l)

no data available

Dr. Peter Meier (CEO)
Geo-Energie Suisse AG
Reitergasse 11
8004 Zürich
Phone: +41 (0)79 248 48 65
E-mail: p.meier@geo-energie.ch