Injection related issues of a doublet system in a sandstone aquifer - A generalized concept to understand and avoid problem sources in geothermal systems

Markó, Ábel; Mádl-Szőnyi, Judit; Brehme, Maren

doi:10.1016/j.geothermics.2021.102234

Cited by 22 publications

(3 citation statements)

References 33 publications

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“…As such, non-linear flow around the injection well might cause higher flow velocities and therefore intensify heterogeneous heat transfer. Further, many thermally triggered effects such as the increase in fracture apertures due to thermal compaction during cooling 26 , 27 , fines mobilization 28 , 29 , or biofilm generation 30 , 31 might strongly affect a reservoir’s longtime behavior. The prediction of these effects can possibly be improved with heterogeneous heat transfer models because they might occur more locally along individual fractures than previously thought.…”

Section: Discussionmentioning

confidence: 99%

Velocity-dependent heat transfer controls temperature in fracture networks

Heinze

Pastore

2023

Nat Commun

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Heat transfer between a fluid and the surrounding rock in the subsurface is a crucial process not only, but most obviously, in geothermal systems. Heat transfer is described by Newton’s law of cooling, relating the heat transferred to a coefficient, the specific surface area, and the temperature difference between rock and fluid. However, parameterizing the heat transfer coefficient in fracture networks poses a major challenge. Here we show that within a fracture network the heat transfer coefficient is strongly heterogeneous but that laboratory single fracture experiments can provide a reasonable estimate in dependence of flow rate. We investigate the distribution of the heat transfer coefficient experimentally as well as numerically and analyze the heat transfer at individual fractures. Our results improve the prediction of temperatures in engineered and natural geothermal systems and allow sustainable management and design of reservoirs considering the role of individual fractures.

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Section: Discussionmentioning

confidence: 99%

Velocity-dependent heat transfer controls temperature in fracture networks

Heinze

Pastore

2023

Nat Commun

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“…A Pécsi Tudományegyetem Rotaqua, Kőmérő és Mecsekérc Zrt.-vel közös GINOP projektje a rétegkárosodások vizsgálata mellett új kútkiképzési módszertant és a hidraulikus stimuláció speciális módját (Frac&Pack) dolgozta ki és alkalmazta szentesi mintaterületen (Nádor 2023;Koroncz et al 2022). Mindemellett lényeges, hogy a problémákat megelőzendő, a földtani-vízföldtani kérdéseket a lokális mellett rezervoár léptékben és regionálisan is értékeljük (Markó-Mádl-Szőnyi-Brehme 2021), lehetővé téve a visszasajtolási potenciál előzetes értékelését (Markó et al 2023).…”

Section: A Lehűlt Termálvíz Visszasajtolása éS a Fenntarthatóságunclassified

Nem lehet mindenhol mindent, de mindenhol lehet valamit – A geotermikus energia hasznosításának lehetőségei a hazai ellátás diverzifikálása érdekében

Mádlné Szőnyi,

Markó,

Tóthi

2024

ScientSec

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Összefoglalás. Magyarországon az energiaválság kapcsán előtérbe került a kedvező geotermikus adottságok kihasználásának szükségessége. A cikkben az európai geotermikus viszonyokból kiindulva mutatjuk be a hazai adottságokat, alkalmazható technológiákat. Az adottságok villamosáram-termelésre csak sporadikusan, magas kockázatok és technológiai fejlesztések mellett alkalmazhatók. Ugyanakkor az ország szinte teljes területén van lehetőség sekély geotermikus és hidrotermás készletek, valamint a hulladékhő további hasznosítására. A jövőben a termálvizek települési szintű, kaszkád rendszerű teljes körű hasznosítása lenne kívánatos. A fenntarthatóság kulcsa a lefűtött termálvizek nagyarányú visszasajtolása. A felszín alatti térrész, a különböző fluidumok és a bennük rejlő nyersanyagok hasznosítása kutatást és új, komplex szemléletet igényel. Summary. The need to exploit the favourable geothermal potential has emerged in Hungary due to the war-induced energy crisis. In this paper, we present the geothermal conditions of Hungary with a European comparison. The elevated heat flux of the Pannonian Basin, thanks to the thinned lithosphere, provides beneficial conditions along with the thermal-bearing aquifers primarily for medium enthalpy resources. We detail the potential technologies applicable to exploit the various types of resources and the risks related to their utilisation. Although not all of the technologies can be applied everywhere in the country, our results show that shallow geothermal or hydrothermal utilisation is possible in the entire country, as well as the utilisation of waste heat from used water or natural springs. Assessing geological risks is a decision criterion in the project preparation phase: supporting the investment with lower geological risk leads to more successful projects and, simultaneously, helps to gain more knowledge about the geological formation. With high risks, Hungarian geothermal resources can only be used sporadically for electricity generation. Experience of ongoing international projects in enhanced geothermal systems should be gathered for the future use of deep basement resources. The main unconsidered potential in Hungary lies in the cascaded use of thermal water at the municipal level, which can be a key in constructing low-carbon district and space heating systems combined with agricultural use. The unsolved research-intensive issue of sustainable exploitation is the extensive reinjection of cooled thermal waters, which prevents the overuse of slowly renewable resources. Developing this sector in Hungary regarding conventional and combined innovative exploitation of the subsurface space requires research and new complex approaches.

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“…Doublet well is widely employed to extract geothermal energy (Su et al, 2018;Markó et al, 2021) by injecting cold water in to one well while extracting hot water from another. The reinjection is expected to maintain reservoir pressure and avoid subsidence (Markó et al, 2021); however, the distance of the wells should be appropriately placed to avert thermal breakthrough (Kamila et al, 2021). Thermal breakthrough will cause the temperature to decline because the injected water may be underheated when flowing through the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Performance of Multi-Well Exploitation and Reinjection in a Small-Scale Shallow Geothermal Reservoir in Huailai County

Yuan

Zhang

et al. 2021

Front. Earth Sci.

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The sustainable development of a shallow aquifer geothermal reservoir is strongly affected by the reinjection–production strategy. However, the reinjection–production strategy optimization of a small-scale exploitation unit with tens of meters of well spacing is site specific and has not yet been fulfilled. This study numerically investigates sustainable heat extraction based on various reinjection–production strategies which were conducted in a single-phase aquitard–aquifer geothermal system in Huailai County, Hebei Province, China. The response of the water level and production temperature is mainly discussed. The numerical results show that production without reinjection induces the highest production temperature and also the water level drawdown. Although reinjection in a single doublet well system is conducive to the control of water level drawdown, the introduction of the thermal breakthrough problem causes a decrease in the production temperature. The thermal breakthrough and sustainability of geothermal reservoirs highly depend on the well spacing between the production and reinjection wells, especially for the small-scale field. Therefore, a large well spacing is suggested. A multi-well system facilitates the control of water level drawdown while bringing intensive well interference and thermal breakthrough. Large spacing between the production and reinjection wells is also the basic principle for the design of the multi-well system. A decrease in openhole length leads to an increase in the production temperature and output thermal power. An increase in the production rate affects the thermal breakthrough highly and shortens the lifetime of the geothermal system. Furthermore, the extracted thermal energy is highly affected by the reduction in the reinjection temperature. The results in this study can provide references to achieve sustainable geothermal exploitation in small-scale geothermal reservoirs.

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Injection related issues of a doublet system in a sandstone aquifer - A generalized concept to understand and avoid problem sources in geothermal systems

Cited by 22 publications

References 33 publications

Velocity-dependent heat transfer controls temperature in fracture networks

Velocity-dependent heat transfer controls temperature in fracture networks

Nem lehet mindenhol mindent, de mindenhol lehet valamit – A geotermikus energia hasznosításának lehetőségei a hazai ellátás diverzifikálása érdekében

Performance of Multi-Well Exploitation and Reinjection in a Small-Scale Shallow Geothermal Reservoir in Huailai County

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