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New article on harmonic pulse test published

New article on harmonic pulse testing published

A new article titeled "Harmonic Pulse Testing for Well Monitoring: Application to a Fractured Geothermal Reservoir" was published in Water Resources Research by DESTRESS WP 5. It discusses Harmonic Pulse Testing (HPT) that aims to determine well and formation parameters such as wellbore storage, skin, permeability, and boundaries within the investigated volume.  The advantage is that it does not require the interruption of well and reservoir injection/production before and/or during the test because it allows the extraction of an interpretable periodic signal from measured pressure potentially affected by interference. This makes it an ideal monitoring tool. Find out more about HPT in the article.

Pohang commission publishes lessons learned

Pohang commission publishes lessons learned

The international commission, which analyzed the magnitude 5.5 Pohang earthquake, comes to an unequivocal conclusion: the nearby geothermal project has caused the damaging event through stimulations at borehole PX2. After having delivered a detailed report at hand of the South Korean government, the commission published a comprehensive summary in Science including lessons learned.

Access the Science paper “Managing injection-induced seismic risks”

Access the commission report

Inauguration of Bedretto Lab

Inauguration of Bedretto Lab

The new rock laboratory "Bedretto Underground Laboratory for Geoenergies" (Bedretto Lab) was inaugurated on 18 May 2018 in Bedretto, Switzerland. More than 200 vistors seized the opportunity to visit the lab and learn more about geothermal research.
The DESTRESS project in Bedretto aims to demonstrate that the construction of a heat exchanger that is sustainable over several decades can be planned and controlled with the aid of hydraulic stimulation processes. The experiments will be carried out on scales of several hundreds of meters. The larger scale implicates longer boreholes, which allow more realistic experiments to be carried out, applying different stimulation concepts.

Similar to other projects, this project will perform in-situ stimulation concepts tests while monitoring hydro-seismo-mechanical key parameters at a high spatial resolution. The addressed questions are:
  1. Which stimulation concepts are appropriate for enhancing the permeability by orders of magnitudes while minimizing induced seismicity?
  2. What are the relationships between the hydro-mechanical response, the stimulation concept, permeability creation, effective porosity, and induced seismicity?
  3. How can micro-seismicity be minimized?
  4. What are the heat exchanger properties of the reservoir?
Find out more about the Bedretto Lab on their website and follow their Instagram account @BedrettoLab.
DESTRESS supporting the Pohang investigations

DESTRESS supporting the Pohang investigations

On 20 March 2019, the independent expert commission will release its report concerning the Pohang earthquake and its potential link to the nearby geothermal project. The event of magnitude 5.4 occurred on 15 November 2017, injuring about 80 people and causing damage to numerous buildings.

In August 2017, DESTRESS conducted a first soft stimulation treatment at the Pohang geothermal site. Experts from GFZ, GES, KICT, KIGAM, NexGEO, SNU, TNO, and UoG were involved. This treatment did not induce any seismic activity larger than magnitude 2.0. DESTRESS supported the seismic monitoring by the deployment of instruments. The project collected important data and has been given access to further information thanks to the partnership with the local site owner, NexGEO. However, the dataset available to DESTRESS is incomplete and less extensive than that to which the expert commission has been granted access.

DESTRESS has conducted various analyses scrutinising seismic, hydraulic, geophysical, and geochemical data in the area concerned. The results were made available to the expert commission. In November 2018, DESTRESS partners met for a workshop (see this news item summarizing the main findings) to discuss preliminary results of the work performed. At the recent annual meeting in Strasbourg, further findings were discussed. The focus laid on the potential for a triggered event. In case of triggered events, even small human activities can potentially accelerate the failure of a naturally pre-stressed fault inducing large earthquakes. However, especially, the two months gap between last injection activities and the damaging earthquake raises questions. The DESTRESS working groups provided potential explanations including diffusion processes or slow chemical reactions. DESTRESS partners are committed to continue to work on this highly unprecedented event. All elaborations will be published in a special issue in Geothermics. In addition, DESTRESS plans to release a report on lessons learned, summarising the main findings on which to base future deep geothermal projects. In the meantime, an overview of existing publications and contributions of DESTRESS partners linked to the Pohang earthquake is available in the result section.



Welcome to DESTRESS

DESTRESS stands for a promising and future-oriented approach to demonstrate soft stimulation methods of EGS. We focus on solutions for the exploitation of underground heat which are economical, sustainable and environmentally responsible. Co-funded by the EU, we contribute to the European energy strategy, which targets renewable energy, greenhouse gas reduction and energy efficiency. The primarily objective of DESTRESS is to develop a comprehensive compilation of good practices for successful geothermal projects through demonstration and research.

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02. - 06.09.2019 in Potsdam, Germany
13th EURO-Conference on Rock Physics and Geomechanics - The Guéguen Conference

27.04. - 01.05.2020 in Reykjavik, Iceland
World Geothermal Congress WGC

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DESTRESS offers virtual and physical access to its sites. Every demonstration site differs in its environment and the stimulation techniques used.