Numerical simulation of electricity generation potential from fractured granite reservoir through a single horizontal well at Yangbajing geothermal field

Zeng, Yongmei; Wu, N.; Zheng, Shuai; Hu, Jian

doi:10.1016/j.energy.2013.10.084

Cited by 52 publications

(53 citation statements)

References 22 publications

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“…Its geographic coordinate ranges from 30 • 01 N to 30 • 05 N and 90 • 27 E to 90 • 31 E, with elevation ranging from 4290 m to 4500 m above sea level [6]. It is the first high-temperature hydrothermal convective geothermal field in China [6,24,25]. Reference [6] reported the geologic structure, hydrological and geothermal features of the Yangbajing geothermal field in detail.…”

Section: The Yangbajing Geothermal Fieldmentioning

confidence: 99%

“…It is the first high-temperature hydrothermal convective geothermal field in China [6,24,25]. Reference [6] reported the geologic structure, hydrological and geothermal features of the Yangbajing geothermal field in detail. In the northern part, well ZK4001 was drilled to 1450 m, and well ZK4002 was drilled to 2006.8 m; both are exploration wells for a deep heat reservoir [6,24,25].…”

Section: The Yangbajing Geothermal Fieldmentioning

confidence: 99%

Section: The Yangbajing Geothermal Fieldmentioning

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: The Yangbajing Geothermal Fieldmentioning

confidence: 99%

Section: The Yangbajing Geothermal Fieldmentioning

confidence: 99%

Section: The Yangbajing Geothermal Fieldmentioning

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

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A review on heat transfer and energy conversion in the enhanced geothermal systems with water/CO₂as working fluid

Zhang

et al. 2015

Int. J. Energy Res.

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Summary Enhanced geothermal systems (EGS) technology is regarded as the future of geothermal energy and could become a major energy source in the future. However, EGS technology is not well developed. The challenges of EGS technology development, such as the small heat‐recovery factors and water limitations, need to be addressed. A comprehensive understanding of heat transfer in the complex subsurface structures is crucial for energy management in the reservoir, and an accurate heat transfer model of the reservoir is a key tool to optimize heat extraction to improve the heat‐recovery factor. The use of CO2 as the EGS working fluid is regarded as an emerging technology to address water limitations. The analytical solutions, lab‐scale experiments, field‐scale modeling methods of water/CO2 fluid flow and heat transfer in the reservoir, and a thermodynamic analysis of the energy conversion system at the surface are reviewed in this paper. Based on the existing literature, future research should focus on improving our knowledge and optimizing the heat transfer performance in the reservoir. Moreover, the emerging design of a heat exchange network in the reservoir and CO2‐EGS could result from technology development. Copyright © 2015 John Wiley & Sons, Ltd.

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Recent development in numerical simulation of enhanced geothermal reservoirs

et al. 2015

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This paper briefly introduces the current state in computer modelling of geothermal reservoir system and then focuses on our research efforts in high performance simulation of enhanced geothermal reservoir system. A novel supercomputer simulation tool has been developing towards simulating the highly non-linear coupled geomechanical-fluid flow-thermal systems involving heterogeneously fractured geomaterials at different spatial and temporal scales. It is applied here to simulate and visualise the enhanced geothermal system (EGS), such as (1) visualisation of the microseismic events to monitor and determine where/how the underground rupture proceeds during a hydraulic stimulation, to generate the mesh using the recorded data for determining the domain of the ruptured zone and to evaluate the material parameters (i.e., the permeability) for the further numerical analysis and evaluation of the enhanced geothermal reservoir; (2) converting the available fractured rock image/fracture data as well as the reservoir geological geometry to suitable meshes/grids and further simulating the fluid flow in the complicated fractures involving the detailed description of fracture dimension and geometry by the lattice Boltzmann method and/or finite element method; (3) interacting fault system simulation to determine the relevant complicated rupture process for evaluating the geological setting and the in-situ reservoir properties; (4) coupled thermo-fluid flow analysis of a geothermal reservoir system for an optimised geothermal reservoir design and management. A few of application examples are presented to show its usefulness in simulating the enhanced geothermal reservoir system. KEY WORDS: numerical simulation, geothermal, EGS, microseismicity, finite element method, lattice Boltzmann method. INTRODUCTIONOver the past 30 years, a large amount of research and field testing on engineered geothermal system (EGS), also known as hot dry rock (HDR) and hot fractured rock (HFR) geothermal reservoirs, have been accomplished worldwide which include the reservoir construction, fluid circulation and heat extraction (e.g., Tester et al., 2006). A successful EGS reservoir depends on thermal-fluid flow at any given time which primarily determined by its mean temperature and pressure, the nature of the interconnected network of hydraulic stimulated joints and open fractures (including both stimulated and natural), the cumulative amount of fluid circulation (reservoir cooling) that has occurred and water loss (Rybach, 2010; Brown et al., 1999). The reservoir characteristics are complicated and functions of the applied reservoir pressure/stress that are controlling the nature and degree of interconnection within the network of fractures, therefore it is crucial to have good measures and understanding of such reservoir characteristics (i.e., permeability)

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Numerical simulation of electricity generation potential from fractured granite reservoir through a single horizontal well at Yangbajing geothermal field

Cited by 52 publications

References 22 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

A review on heat transfer and energy conversion in the enhanced geothermal systems with water/CO₂as working fluid

Recent development in numerical simulation of enhanced geothermal reservoirs

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Numerical simulation of electricity generation potential from fractured granite reservoir through a single horizontal well at Yangbajing geothermal field

Cited by 52 publications

References 22 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

A review on heat transfer and energy conversion in the enhanced geothermal systems with water/CO2as working fluid

Recent development in numerical simulation of enhanced geothermal reservoirs

Contact Info

Product

Resources

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A review on heat transfer and energy conversion in the enhanced geothermal systems with water/CO₂as working fluid