Investigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: A case study in the Gonghe Basin, Northwestern China

Investigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: A case study in the Gonghe Basin, Northwestern China

Reasonably designing a multi-well layout has required attention to improve the enhanced geothermal system (EGS) productivity in a fractured reservoir. The optimization of the well layout includes several constraints which depend on the geological conditions, the thermal potential of the reservoir, a...

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Autores principales: Zhihong Lei, Yanjun Zhang
Formato: article
Lenguaje:EN
Publicado: Elsevier 2021
Materias:
Deep-seated geothermal
Well layout
Fractured reservoir
EGS productivity
Power generation
Electrical engineering. Electronics. Nuclear engineering
TK1-9971
Acceso en línea:https://doaj.org/article/164137e5786c495498bf75a2d84309c3
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spelling oai:doaj.org-article:164137e5786c495498bf75a2d84309c32021-11-24T04:32:04ZInvestigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: A case study in the Gonghe Basin, Northwestern China2352-484710.1016/j.egyr.2021.10.115https://doaj.org/article/164137e5786c495498bf75a2d84309c32021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721011331https://doaj.org/toc/2352-4847Reasonably designing a multi-well layout has required attention to improve the enhanced geothermal system (EGS) productivity in a fractured reservoir. The optimization of the well layout includes several constraints which depend on the geological conditions, the thermal potential of the reservoir, and the investment cost. The power generation potential of a fractured deep-seated geothermal reservoir in the Gonghe Basin, Northwestern China is analyzed and an optimized well pattern proposed. We simulate the long-term heat extraction process of EGSs of four well layouts, including the standard doublet well layout, two triplet well layouts, and a five-spot well layout. The results from multiple points such as fluid impedance, energy production, energy efficiency, and energy cost indicate that an EGS with five-spot well layout can perform better than an EGS with triplet well and doublet well layouts in a fractured reservoir. A five-spot layout EGS could yield an electric power of 6.66–9.71 MW, with the flow impedance of 0.05–0.08 MPa/(kg/s), at an energy efficiency of 19.3–70.2 over a 30-year period in the Gonghe Basin. The operation of such a system could achieve profitability in its sixth year, and the levelized cost of energy (LCOE) is 0.019–0.08 $/kWh.Zhihong LeiYanjun ZhangElsevierarticleDeep-seated geothermalWell layoutFractured reservoirEGS productivityPower generationElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 7741-7758 (2021)
institution DOAJ
collection DOAJ
language EN
topic Deep-seated geothermal
Well layout
Fractured reservoir
EGS productivity
Power generation
Electrical engineering. Electronics. Nuclear engineering
TK1-9971
spellingShingle Deep-seated geothermal
Well layout
Fractured reservoir
EGS productivity
Power generation
Electrical engineering. Electronics. Nuclear engineering
TK1-9971
Zhihong Lei
Yanjun Zhang
Investigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: A case study in the Gonghe Basin, Northwestern China
description Reasonably designing a multi-well layout has required attention to improve the enhanced geothermal system (EGS) productivity in a fractured reservoir. The optimization of the well layout includes several constraints which depend on the geological conditions, the thermal potential of the reservoir, and the investment cost. The power generation potential of a fractured deep-seated geothermal reservoir in the Gonghe Basin, Northwestern China is analyzed and an optimized well pattern proposed. We simulate the long-term heat extraction process of EGSs of four well layouts, including the standard doublet well layout, two triplet well layouts, and a five-spot well layout. The results from multiple points such as fluid impedance, energy production, energy efficiency, and energy cost indicate that an EGS with five-spot well layout can perform better than an EGS with triplet well and doublet well layouts in a fractured reservoir. A five-spot layout EGS could yield an electric power of 6.66–9.71 MW, with the flow impedance of 0.05–0.08 MPa/(kg/s), at an energy efficiency of 19.3–70.2 over a 30-year period in the Gonghe Basin. The operation of such a system could achieve profitability in its sixth year, and the levelized cost of energy (LCOE) is 0.019–0.08 $/kWh.
format article
author Zhihong Lei
Yanjun Zhang
author_facet Zhihong Lei
Yanjun Zhang
author_sort Zhihong Lei
title Investigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: A case study in the Gonghe Basin, Northwestern China
title_short Investigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: A case study in the Gonghe Basin, Northwestern China
title_full Investigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: A case study in the Gonghe Basin, Northwestern China
title_fullStr Investigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: A case study in the Gonghe Basin, Northwestern China
title_full_unstemmed Investigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: A case study in the Gonghe Basin, Northwestern China
title_sort investigation on the effect of symmetrical multi-well layout on geothermal energy extraction from a fractured granitic reservoir: a case study in the gonghe basin, northwestern china
publisher Elsevier
publishDate 2021
url https://doaj.org/article/164137e5786c495498bf75a2d84309c3
work_keys_str_mv AT zhihonglei investigationontheeffectofsymmetricalmultiwelllayoutongeothermalenergyextractionfromafracturedgraniticreservoiracasestudyinthegonghebasinnorthwesternchina
AT yanjunzhang investigationontheeffectofsymmetricalmultiwelllayoutongeothermalenergyextractionfromafracturedgraniticreservoiracasestudyinthegonghebasinnorthwesternchina
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