Deep geothermal energy

Renewable energies except solar electric or thermal (seeforums dedicated below): wind turbines, energy from the sea, hydraulic and hydroelectricity, biomass, biogas, deep geothermal energy ...
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Did67
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Re: Deep geothermal energy




by Did67 » 12/06/16, 10:59

Yes, that's it.

The "inflation" forces are impressive: my grandfather worked in a sandstone quarry in the Vosges; they cut down huge blocks with trunks which they introduced into holes, dry and by force, then they watered!
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Re: Deep geothermal energy




by Christophe » 12/06/16, 14:25

Yes absolutely I have already seen this method of bursting :)
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Re: Deep geothermal energy




by moinsdewatt » 12/06/16, 14:39

Did67 wrote:Yes, that's it.

The "inflation" forces are impressive: my grandfather worked in a sandstone quarry in the Vosges; they cut down huge blocks with trunks which they introduced into holes, dry and by force, then they watered!


The Egyptians were already doing this for the careers of the time of the pharaohs.
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Re: Deep geothermal energy




by Ahmed » 12/06/16, 15:56

Although this method still works, there is a more modern version in the form of a expansive concrete. But the price is not the same ...
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Re: Deep geothermal energy




by Christophe » 13/06/16, 14:45

With beer, it also works when you forget your beers in the freezer. :D :D

science-and-technology / supercooling-in-my-beer-bottle-t14781.html

hihihi
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Re: Deep geothermal energy




by moinsdewatt » 22/01/17, 20:37

ENGIE SELECTED TO BUILD A NEW HEAT NETWORK IN BORDEAUX

20 January 2017

The Engie group was awarded the contract for the public service delegation of the new one last Thursday 12 January geothermal heat network from the Plaine Rive Droite of Bordeaux Métropole. For the first time in France in almost 30 years (outside the Paris region), this project will explore new geological horizons (deep aquifers) in order to discover a deeper and warmer source, and to exploit geothermal energy as green energy source to supply a heating network.

Engie, via its subsidiaries Cofely and Storengy, announced last week in a press release having won a contract to build and operate for 30 years a heating network which will supply several districts of Bordeaux. This network will be mainly supplied (82%) by geothermal energy, that is to say the exploitation of heat located at a great depth underground, and supplemented by natural gas (18%).

The work phase should begin after obtaining all the administrative authorizations, specifies Engie. The drilling of the geothermal doublet, consisting of a producing well and a reinjection well, which will start in early 2019 and will last 4 months, will be carried out by Storengy, a subsidiary of Engie. Cofely, another French group subsidiary specializing in energy services, will take care of the management and maintenance of the network.

This project will represent a global budget of 43 million euros, intended for the construction of the production plant with sustainable materials and 25 km of network. It will create 38 direct or indirect jobs, including 10 for integration, and will supply heat to nearly 28.000 homes in the districts of Brazza, Niel, Benauge and Garonne-Eiffel, located on the right bank of the Garonne.

https://lenergeek.com/2017/01/20/engie- ... -bordeaux/
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Re: Deep geothermal energy




by moinsdewatt » 22/04/17, 13:30

DEEP GEOTHERMAL IS THE SUBJECT OF A NEW PROJECT IN STRASBOURG

Wed 19 Apr 2017

Strasbourg inaugurated the Reichstett site at the end of March 2017. On the site of this former refinery undergoing demolition, the city will build the first deep geothermal station in an urban environment. A French first, while geothermal energy is starting to be exploited more and more in France. The Alsatian project attracts everyone's attention because it may well herald a wider deployment of this new energy solution. Indeed, several French regions also plan to develop geothermal power plants in order to offer a local energy alternative to consumers.

Image
......................

............ water is found in its basement at very high temperatures, at relatively low depths (less than five kilometers deep). An exploration well was installed in October 2015 to ensure the site's potential, and it was the results of the preparatory study that made it possible to make the final choice of the city in this industrial area.

Concretely, the hot water will be drawn to a depth of 4 meters and its world temperature at 500 ° C. Due to the depth and intense heat of the water, drilling the operating wells and building the power plant is more complex for a conventional thermal power plant. In order to make the most of this installation, the plant will operate in cogeneration, that is to say, it will provide both electricity and heating. For officials of the Strasbourg town hall, this is the assurance of having local energy available all the time.

Ultimately, the rest of the Reichstett refinery site will host an EcoParc with accommodation, offices and agricultural activity. Again, this is a first in France: no other geothermal station has so far been used for industrial purposes. The central heating circuit must supply agricultural greenhouses at a constant temperature of 30 ° C.
......................

In the end, the cost of installing Reichstett is estimated at more than 40 million euros (ADEME in finance 20 million) and it seems quite uncompetitive compared to the price of renewable energy installations like solar or l wind. For Fonroche, the company responsible for the works, the high starting price must be weighed against the advantageous cost in the long term. The station is expected to be commissioned in 2019 and is expected to provide energy and heating for more than 50 years. With low operating costs and guaranteed regularity of prices, the deep geothermal station hopes to appeal to skeptics.

https://lenergeek.com/2017/04/19/geothe ... trasbourg/
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Re: Deep geothermal energy




by sen-no-sen » 31/07/19, 10:53

Renewable energy: Is the State wrongly abandoning the production of electricity by geothermal energy?
Industrial choice In its new strategy for energy and climate, the government has decided to no longer financially support part of the sector, prompting sector players to react



Power cut for geothermal energy. By the end of 2019, the government will definitively adopt its Multi-Year Energy Programming (PPE) project. The text lays the foundations for the energy future of France and in particular sets targets for renewable energy by 2028. If the State has chosen to support many sectors, the production of electricity by geothermal energy deep or stimulated was left out.

Geothermal energy consists of using water vapor to create heat and / or electricity. In Bouillante in Guadeloupe, electricity is naturally produced by vapors from underground hot water sources. Going up, the latter turn a turbine which will activate an alternator, the rotary movement of which will create electricity. In France, this principle is reproduced by drilling the ground, in order to propel water to it several thousand meters deep, where the rock is very hot.
An expensive technology ...

Except that producing electricity in this way remains expensive. "In 2015, the production cost was estimated at 246 euros per megawatt hour (MWh), but the State wants the purchase price not to exceed 100 euros by 2028", explains Philippe Laplaige, consultant expert in geothermal energy at Ademe. "There is a desire on the part of the government to favor the production of renewable electricity from the most competitive sectors," adds Marion Lettry, deputy general delegate to the Syndicate of renewable energies. The funding of geothermal operations is therefore frozen for the production of electricity, but not of heat, the production technique of which is more profitable. This interim decision is far from suitable for everyone.

“It is an emerging sector. It is by multiplying the operations and the number of boreholes that we will acquire mastery, know-how and that we will lower costs. This is how the other renewable energy sectors have become so competitive, ”explains the Ademe specialist. “Ten years ago, the cost of generating electricity from offshore wind turbines was around 150-180 € / MWh. Today, that of the park off the coast of Dunkirk [North] is € 44 / MWh ”, illustrates Marion Lettry.
... but already a lot of money invested

"There, it is prevented from developing when we had already invested a lot of money in research", laments Philippe Laplaige. In fact, an experiment took place from 1987 to 2012 at the Soultz-Sous-Forêts pilot plant in Alsace. Since then, this European program has made it possible to develop around twenty projects with State support. Two, led by the companies Fonroche and Electricité de Strasbourg, are already in the installation and testing phase around the Alsatian capital. “The state decision breaks the dynamics of the sector. No one is going to want to invest anymore. "

France is tenth in the world for electric geothermal energy (if that's what the @thinkgeoenergy site says. Good, but then why the #PPE doesn't want it anymore? https://t.co/luj6gJ3qyn
- Gilles David (@gillesdavid) May 31, 2019

The expert drives the point home by clarifying that “deep geothermal energy is more complicated to set up than others, but can supply electricity permanently and does not require spreading out unlike solar energy for example . Each sector has its disadvantages and advantages, you have to make a mix of the whole. "

For her part, Marion Lettry points out that deep geothermal energy would encourage the production of lithium, used in automotive batteries. “Lithium is strongly present in geothermal waters which circulate deep in Alsace, the Pyrenees or the Massif Central. According to initial estimates, with ten power plants, production could reach 6% of current world lithium production per year. Industry players hope that these arguments will put geothermal energy back in the spotlight.


https://www.20minutes.fr/magazine/transition-energetique-mag/2562071-20190711-energie-renouvelable-etat-abandonne-tort-production-electricite-geothermie
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Re: Deep geothermal energy




by sicetaitsimple » 31/07/19, 16:01

It seems entirely reasonable to me to abandon the geothermal sector for electricity production in France. The yield is poor, it is very expensive and there are not really any serious avenues for improvement.

For heat (in mainland France) or for electricity (elsewhere), that is discussed.
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Re: Deep geothermal energy




by moinsdewatt » 08/08/20, 16:12

Geothermal energy: Ile-de-France is making better use of its enormous potential

Bernard Deboyser 23 Jul 2020

The inhabitants of the Paris basin have two deep aquifers that are worth gold under their feet: hot underground water tables. Since the first drilling carried out in Melun in 1969, geothermal projects have followed one another. Operated today by around fifty heating networks, they supply the equivalent of 250.000 homes.
In Bobigny a derrick has been at work for several months. Four experimental wells are drilled there. If the project is successful, it will open up new perspectives for French geothermal energy

Located between 1.500 and 2.000 meters deep, the Dogger is the main aquifer exploited in the Paris region, the most productive in Europe in terms of geothermal potential. This limestone geological formation 150 to 175 million years old conceals a fossil layer whose temperature varies between 60 and 80 ° C. Highly loaded with mineral salts, the brackish water of the Dogger is unfit for consumption but the heat it contains can be used to supply district heating networks. It is indeed a renewable energy since after having transferred its calories in an exchanger, the water is reinjected into the subsoil where it is heated by circulating in the geological layers. On a human scale, this energy is also inexhaustible because it is supplied mainly by the natural disintegration of radioactive elements contained in the earth's crust, such as uranium and thorium. Continuously exploitable, geothermal energy does not depend on weather conditions and therefore does not require storage. In addition, its operation does not emit greenhouse gases. In short, it is “perfect” energy… or almost.

This is why since the first drilling carried out in the Dogger at Melun in 1969, geothermal projects have followed one another in Île-de-France. Operated today by around fifty heating networks, they supply the equivalent of 250.000 homes. The conditions are in fact met there to make it the largest geothermal operation in Europe: a large sedimentary basin with a deep hot water aquifer and, at the surface, a high population density allowing economic exploitation by local people. district heating networks.

Avoid overexploitation of the deposit

But the danger that threatens a geothermal field is that of its over-exploitation. The water, when it is reinjected into the web is cooled to about 40 ° C. The result of the operation is therefore to create a cold bubble around the reinjection well. If at the surface the head of the pumping well and that of the reinjection well are close to each other, the latter is drilled obliquely so that at depth a distance of several kilometers separates the catchment from the reinjection.
In spite of everything, a growth of this cold bubble can lead to the cooling of the resource in the long term and call into question its exploitation. In the Paris basin, the risk has increased in recent years due to the increase in new drilling.


In 1985, specialists in the operation of the Ile-de-France Dogger estimated that the extension of the cold zones would lead to the closure of geothermal heating networks around 2005. But 30 years later, new studies based on the monthly readings carried out by the operators showed that geothermal energy in Île-de-France still has a bright future ahead of it. Apart from the case of the Alfortville drilling where a drop of 3 ° C was observed, the simulations predict a thermal decrease which should not be felt in the aquifer before the 2040s.

However, to avoid overexploitation of the deposit and delay the deadline, the Sipperec (Paris intercommunal union for energy and communication networks) decided to experiment in Bobigny with an extraction in a deeper geological layer, that of the Triassic , located under the Dogger, 2.100 meters from the surface. The water in this aquifer is naturally warmer: 80 ° C against 60 ° C in the Dogger at this location.
The exploitation of the Triassic, if it succeeds, would be a first in France and it would open up new prospects for French geothermal energy. In particular, it would make it possible to prospect in the west of the Paris region, where the temperature of the water pumped into the Dogger is not sufficient to ensure economic exploitation. Today, two-thirds of the Ile-de-France wells are concentrated in the east, south and north, mainly in Val-de-Marne. However, setting out to conquer the west would require the green light from the state and the mining authorities.

Descending into the Triassic increases the risks

The cost of deeper boreholes is obviously higher: going down in the Triassic amounts to 9 million euros per well against 5 million for those who stop in the Dogger. But the operation of hotter water gives rise to hopes of lower operating costs. According to Sipperec, the price charged to network users could even be reduced. On the surface, the water pumped into the borehole is in fact not immediately usable in the network. It transfers its heat, in an exchanger, to a secondary circuit, the temperature of which must be raised by heat pumps, which results in electricity consumption. Extracting hotter water is therefore the assurance of reduced energy expenditure.
The Triassic rock being more friable, the risks are also higher and, in the past, two attempts have already failed. As in oil exploration, the success of geothermal drilling is never guaranteed: at the end of the day, the water temperature may be too low or its flow insufficient.
The experiment is of great interest to Ademe and the Region, which respectively finance 17 and 4 of the 78 million euros of planned investments. Sipperec brings almost 50 million.

In Bobigny, below the Parc de la Bergère, a derrick began drilling four wells on November 21: 2 for pumping and 2 for reinjection. Work continued throughout the confinement. The wells have been drilled to the Dogger aquifer at a depth of about 1.800 meters. It was a success: the tests carried out showed that the temperatures and flow rates were in line with what was expected. Continuation of drilling up to the Triassic at 2.100 meters deep began on May 25.
If all goes well, the Genyo network will see the light of day there by 2021. Thirty kilometers long, it will supply green heat to the equivalent of 20.000 homes in the town and in Drancy, its neighbor. The project will prevent the emission of 30.000 tonnes of CO2 annually.


https://www.revolution-energetique.com/ ... potentiel/
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