地熱探査井の深層ボアホール熱交換器への転用：不均質性・流動方向・循環流量の長期的影響の理解
Repurposing a Geothermal Exploration Well as a Deep Borehole Heat Exchanger:Understanding Long-Termeffects of Heterogeneity, Flow Direction and Circulation Flow Rate (原題)
Kolo, Isa, Brown, Christopher S., Falcone, Gioia, Banks, David
🤖 gxceed AI 要約
日本語
既存の地熱探査井（NSCDGB）を深層ボアホール熱交換器（DBHE）として転用する可能性を、OpenGeoSysによる数値モデリングで検討した研究。均質・不均質モデルを比較し、922m深度で50kWの熱負荷が25年間維持可能で、COP4.33のヒートポンプ併用時には隣接建物の熱需要の最大72%を賄えることを示した。地層の不均質性の影響は小さく、既存井の有効活用が脱炭素熱供給のコスト・リスク低減に寄与しうることを示唆する。
English
This study models repurposing an existing geothermal exploration well (NSCDGB) as a deep borehole heat exchanger (DBHE) using OpenGeoSys. Homogeneous and heterogeneous simulations show a 50-kW heat load can be sustained for 25 years at 922 m depth, meeting up to 72% of an adjacent building's heat demand with a COP-4.33 heat pump. Heterogeneity has minor impact, suggesting repurposed wells can cost-effectively decarbonize heating.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本は温泉資源保護と地熱開発の両立が課題で、既存井・廃坑井の転用は新規掘削のリスクとコストを避ける現実的選択肢となりうる。脱炭素熱供給はSSBJのScope1排出削減やTCFDの移行計画とも連動し、地域熱供給の事業性評価に資する。
In the global GX context
Globally, repurposing existing or depleted wells for geothermal heat supports corporate decarbonization of Scope 1 heating and transition-plan credibility under ISSB/CSRD. It offers a low-capex pathway for hard-to-abate heat demand, relevant to transition finance and industrial decarbonization strategies.
👥 読者別の含意
🔬研究者:既存坑井転用DBHEの長期性能評価手法と不均質性の影響を定量化した点が参考になる。
🏢実務担当者:自社の廃坑井・探査井を熱供給資産として再評価し、脱炭素熱源のコスト低減策として検討できる。
🏛政策担当者:地熱開発の許認可・補助制度において既存井転用を促進する枠組み設計の根拠となりうる。
📄 Abstract（原文）
In the drive to achieve net-zero carbon emissions, decarbonisation of heating is essential. This can be facilitated by geothermal energy, but drilling geothermal wells is associated with high risks and costs. The use of preexisting wells (e.g., exhausted hydrocarbon wells or failed geothermal exploration boreholes) offsets this cost while potentially turning liabilities into assets. The Newcastle Science Central Deep Geothermal Borehole (NSCDGB) is a geothermal exploration well that was drilled to target the Carboniferous Fell Sandstone Formation at 1418.5 to 1795 m depth. However, low hydraulic conductivities prevented the development as a conventional “wet” geothermal abstraction well; therefore, new alternative methods of development are being explored. This work investigates the repurposing of the NSCDGB as a deep borehole heat exchanger (DBHE), focusing on the sustainable operation of the system in the long term by employing a constant heat load designed to contribute to local buildings or a heat network. Numerical modelling was undertaken by using OpenGeoSys software to analyse the thermal and hydraulic performance of the system. Both homogeneous and heterogeneous models were developed to compare the influence of lithological layering in contrast to a homogeneous (nonstratified) subsurface geological model. Results from homogeneous simulations modelling the DBHE to a depth of 922 m show that a 50-kW heat load can be supported for a lifetime of 25 years. This corresponds to a 65-kW building load when coupled to a heat pump with a coefficient of performance of 4.33. Thus, the DBHE could meet up to 72% of the heat demand of the adjacent urban sciences building. Rather than being a purely hypothetical case study, this work considers a real existing borehole, adjacent to a building cluster which could make use of the geothermal heat. Heterogeneity, which has been considered for the first time at the NSCDGB site, exhibits a minor impact in comparison to homogeneous simulation results. Flow direction and mass ...
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