Numerical investigation of electricity generation potential from fractured granite reservoir by water circulating through three horizontal wells at Yangbajing geothermal field

Zeng, Yongmei; Zhan, Jie-Min; Wu, N.; Luo, Ying-Ying; Cai, Wen-Hao

doi:10.1016/j.applthermaleng.2016.03.148

Cited by 31 publications

(30 citation statements)

References 17 publications

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“…The initial pressure at the injection well at z = −1325 m is P wo = 11.35 MPa. If the safety factor f is f = 1.32 [4][5][6][7][8][9], the maximum available pressure P max at the injection well is P max = f ·P wo = 14.98 MPa. During the whole 20 years of heat production, the injection pressure P inj must be lower than P max = f ·P wo = 14.98 MPa.…”

Section: Heat Production Methodsmentioning

confidence: 99%

“…This pressure range is computed according to the relationship between pressure P (MPa) and depth z (m) as P = −0.0089z − 0.4444 (MPa), which is also indicated in [25]. More information about the Yangbajing geothermal field can been found in reference [6][7][8][9]19,24,25]. 0.0089 0.4444 (MPa) P z = − − , which is also indicated in [25].…”

Section: The Yangbajing Geothermal Fieldmentioning

confidence: 99%

“…The cap rock and base rock of the 950~1350 m fractured granite reservoir at the Yangbajing geothermal field has only very slight permeability [6][7][8][9]19], and the cap rock and the base rock can be assumed to be impermeable, as shown as in Figure 2. Because there is only very slight conductive heat transfer between the permeable reservoir and the impermeable cap and base rock, this conductive heat transfer can be neglected [6][7][8][9]19].…”

Section: Domain Grid and Parametersmentioning

confidence: 99%

“…Zeng et al employed the EPM method to investigate the electricity generation potential through a single horizontal well [6], multiple vertical wells [7], multiple horizontal wells [8], and a single vertical well [9] at Yangbajing geothermal field, and the results show that the horizontal well system has better electricity generation performance under the same conditions. Based on thermodynamic non-equilibrium assumption, Jiang et al employed the EPM method to develop a three-dimensional transient model for an EGS subsurface hydraulic-thermal process and used the novel model to analyze the performance characteristics of the heat production of EGS [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, we can simultaneously neglect the effects of rock deformation and chemical reaction and just assume that after stimulation the fracture aperture and spacing remain unchanged over the heat production lifetime. Previous studies prove that the effect of reservoir heterogeneities on the production performance of EGS is obvious and complicated; for the purpose of simplification, in this work, only the homogeneous reservoir is considered, and the detailed content on the reservoir heterogeneities will be addressed in future work [4][5][6][7][8][9]19,22].…”

Section: Introductionmentioning

confidence: 99%

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Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field

Zeng

Tang

et al. 2017

Energies

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Abstract:The main conditions affecting electricity generation performance of an enhanced geothermal system (EGS) include reservoir porosity, reservoir permeability, rock heat conductivity, water production rate and injection temperature. Presently there is lack of systematic research the relative importance of the five aforementioned conditions. The orthogonal test method is a statistical approach to analyze multi-factor and multi-level influence on system performance. In this work, based on the geological data at Yangbajing geothermal field, we analyzed the five conditions affecting the electricity generation performance of EGS, and ranked the relative importance of the five factors. The results show that the order of the relative importance of the conditions on electric power is water production rate > injection temperature > reservoir porosity > rock heat conductivity > reservoir permeability; the order of the relative importance of the conditions on reservoir impedance is reservoir permeability > injection temperature > water production rate > reservoir porosity > rock heat conductivity; the order of the relative importance of the conditions on pump power is water production rate > reservoir permeability > injection temperature > reservoir porosity > rock heat conductivity, and; the order of the relative importance of the conditions on energy efficiency is water production rate > reservoir permeability > reservoir porosity > injection temperature > rock heat conductivity. The construction of an EGS reservoir should be located at a formation with higher reservoir porosity or rock heat conductivity, while the determination of reservoir permeability, water production rate and injection temperature should be based on the comprehensive target.

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Section: Heat Production Methodsmentioning

confidence: 99%

Section: The Yangbajing Geothermal Fieldmentioning

confidence: 99%

Section: Domain Grid and Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field

Zeng

Tang

et al. 2017

Energies

Self Cite

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Progress on rock thermal energy storage (RTES): A state of the art review

Amiri

Ermagan

Kurnia

et al. 2023

Energy Science & Engineering

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Thermal energy is one of the most widely encountered energy forms in our daily life. To ensure efficient utilization and conversion of this energy, the balance between supply and demand needs to be maintained. For this purpose, thermal energy storage is required. There are various thermal energy storage systems available; one of the most basic is sensible thermal energy storage which includes rock thermal energy storage (RTES). This rock‐based energy storage has recently gained significant attention due to its capability to hold large amounts of thermal energy, relatively simple storage mechanism and low cost of storage medium. Accordingly, numerous studies have been conducted to elucidate the basic flow and heat transfer mechanism and to evaluate the performance of this energy storage. The major technical challenges hindering the wide adoption of this technology are the enormous pressure drop across the storage and nonoptimal heat transfer from the heat transfer fluid to the storage medium and vice versa. These issues will directly and indirectly affect the overall cost (capital, operational, and maintenance costs) of the system. To eliminate this issue and assist further development of this technology, it is crucial to compile and extract important findings from these previous studies, identify the challenge and research gap, and draw guidelines for the upcoming research and development. At the moment, this kind of compilation does not exist. Hence, this paper is prepared with the primary objective to comprehensively review the current technology and development of RTES and to propose a potential way forward based on the pain point identified. Discussion on the nontechnical aspect such as policy and regulations as well as community awareness will also be outlined and discussed.

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Numerical investigation of the efficiency of emission reduction and heat extraction in a sedimentary geothermal reservoir: a case study of the Daming geothermal field in China

Guo

Song

Killough

et al. 2017

Environ Sci Pollut Res

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The utilization of geothermal energy is clean and has great potential worldwide, and it is important to utilize geothermal energy in a sustainable manner. Mathematical modeling studies of geothermal reservoirs are important as they evaluate and quantify the complex multi-physical effects in geothermal reservoirs. However, previous modeling efforts lack the study focusing on the emission reduction efficiency and the deformation at geothermal wellbores caused by geothermal water extraction/circulation. Emission efficiency is rather relevant in geothermal projects introduced in areas characterized by elevated air pollution where the utilization of geothermal energy is as an alternative to burning fossil fuels. Deformation at geothermal wellbores is also relevant as significant deformation caused by water extraction can lead to geothermal wellbore instability and can consequently decrease the effectiveness of the heat extraction process in geothermal wells. In this study, the efficiency of emission reduction and heat extraction in a sedimentary geothermal reservoir in Daming County, China, are numerically investigated based on a coupled multi-physical model. Relationships between the efficiency of emission reduction and heat extraction, deformation at geothermal well locations, and geothermal field parameters including well spacing, heat production rate, re-injection temperature, rock stiffness, and geothermal well placement patterns are analyzed. Results show that, although large heat production rates and low re-injection temperatures can lead to decreased heat production in the last 8 years of heat extraction, they still improve the overall heat production capacity and emission reduction capacity. Also, the emission reduction capacity is positively correlated with the heat production capacity. Deformation at geothermal wellbore locations is alleviated by smaller well spacing, lower heat production rates, and smaller numbers of injectors in the well pattern, and by placing wells at locations with higher rock stiffness. Compared with the reference case with coal burning for heating purposes, the yearly emission reduction capacity can reach 1 × 10 kg by switching to the direct utilization of geothermal energy in Daming field.

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Numerical investigation of electricity generation potential from fractured granite reservoir by water circulating through three horizontal wells at Yangbajing geothermal field

Cited by 31 publications

References 17 publications

Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field

Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field

Progress on rock thermal energy storage (RTES): A state of the art review

Numerical investigation of the efficiency of emission reduction and heat extraction in a sedimentary geothermal reservoir: a case study of the Daming geothermal field in China

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