Electricity generation from a three-horizontal-well enhanced geothermal system in the Qiabuqia geothermal field, China: Slickwater fracturing treatments for different reservoir scenarios

Lei, Zhihong; Zhang, Yanjun; Zhang, Senqi; Fu, Lei; Hu, Zhongjun; Yu, Ziwang; Li, Liangzhen; Zhou, Jian

doi:10.1016/j.renene.2019.06.024

Cited by 102 publications

(20 citation statements)

References 29 publications

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“…The stress regime in this area is strike-slip, turning into compressional in the southern part. The magnitude of σ V is based on computer modeling at 95-100 MPa and σ H at 85-92 MPa, while the magnitude of σ h at 68-72 MPa, at a depth of about 3700 m, was estimated [69]. The elastic parameters of the Qiabuqia granite were estimated as E-40-56 GPa and v-0.25-0.33 (-) [68].…”

Section: Qiabuqia (China)mentioning

confidence: 99%

“…The modeling indicated that the tensile strength of the rock, as well as Young's modulus, had a significant effect on the fracture geometry, while porosity, permeability and Poisson's ratio had little effect. In the case of the slickwater-based stimulation scenario, low pumping rates of 0.5-3 m 3 /min were proposed to avoid the use of high-power fracturing equipment, and total liquid volumes of 12,000 to 20,000 m 3 of slick to obtain the desired fracture network [69].…”

Section: Qiabuqia (China)mentioning

confidence: 99%

“…Based on the numerical simulations, a triplet system located at the line of the maximum horizontal stress (NE-SW) azimuth and separated from each other by about 300-500 m was designed. Forecasts of the thermal and energy efficiency for this system were also prepared [69]. 327 at 4390 m [16] Core samples from EE-2 well: granodiorite, gneiss [31] Strike-slip/normal [32] Estimated gradients: σ V = σ H -25 MPa/km, σ h -13-19 MPa/km, P P -10 MPa/km [32] 3-axial lab test, confining: 20 MPa EE-2 core, 3916 m depth: E-15-22, v-0.12-0.17.…”

Section: Qiabuqia (China)mentioning

confidence: 99%

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Hydraulic Fracturing in Enhanced Geothermal Systems—Field, Tectonic and Rock Mechanics Conditions—A Review

2021

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Hydraulic fracturing (HF) is a well-known stimulation method used to increase production from conventional and unconventional hydrocarbon reservoirs. In recent years, HF has been widely used in Enhanced Geothermal Systems (EGS). HF in EGS is used to create a geothermal collector in impermeable or poor-permeable hot rocks (HDR) at a depth formation. Artificially created fracture network in the collector allows for force the flow of technological fluid in a loop between at least two wells (injector and producer). Fluid heats up in the collector, then is pumped to the surface. Thermal energy is used to drive turbines generating electricity. This paper is a compilation of selected data from 10 major world’s EGS projects and provides an overview of the basic elements needed to design HF. Authors were focused on two types of data: geological, i.e., stratigraphy, lithology, target zone deposition depth and temperature; geophysical, i.e., the tectonic regime at the site, magnitudes of the principal stresses, elastic parameters of rocks and the seismic velocities. For each of the EGS areas, the scope of work related to HF processes was briefly presented. The most important HF parameters are cited, i.e., fracturing pressure, pumping rate and used fracking fluids and proppants. In a few cases, the dimensions of the modeled or created hydraulic fractures are also provided. Additionally, the current state of the conceptual work of EGS projects in Poland is also briefly presented.

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Section: Qiabuqia (China)mentioning

confidence: 99%

Section: Qiabuqia (China)mentioning

confidence: 99%

Section: Qiabuqia (China)mentioning

confidence: 99%

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Hydraulic Fracturing in Enhanced Geothermal Systems—Field, Tectonic and Rock Mechanics Conditions—A Review

2021

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“…However, the geothermal energy stored in the deep layer is a clean and renewable energy. Moreover, the reserve is very abundant, the advantage of environmental protection is obvious, the application field is wide, and it is a reliable, stable, and impervious to climatic conditions during exploitation and utilization [10,19,20]. The exploitation of geothermal energy requires a heat transfer fluid (cold fluid) to bring thermal energy to the ground.…”

Section: The Extension and Integration From Deep Mineral Mining To Dementioning

confidence: 99%

The Concept, Technical System and Heat Transfer Analysis on Phase-Change Heat Storage Backfill for Exploitation of Geothermal Energy

Zhang

Liu

et al. 2020

Energies

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In view of high ground stress, high geothermal temperature, and thermal hazard during deep mineral resource exploitation, the concept of phase-change heat storage backfill was put forward in this study. Further, the corresponding technical system was constructed and the main content involved in technical system, which is the optimized proportion of the backfill slurry added with phase-change materials (PCMs), was examined. Moreover, we elaborated upon the collaborative optimization of a backfill body’s mechanical and thermal properties and the mutual cooperation on backfill mining, geothermal energy exploitation, and simultaneous stope cooling. The heat transfer behavior of a backfill body plays a key role in technology system. We numerically simulated the heat transfer among a backfill body, surrounding rock, and airflow in the heat storage process, as well as the heat transfer between backfill body and cold fluid during the heat release process. The temperature distribution of a backfill body at different heat storage/heat release times—i.e., the temperature distribution and its evolution—with heat transfer were revealed and analyzed. This study can provide theoretical guidance for a phase-change heat storage backfill, as it has an important significance for the collaborative exploitation of mineral resources and geothermal energy.

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“…To achieve efficient exploitation of HDR geothermal energy, various well-fracture systems for EGS have been proposed. These include the single horizontal well-fracture system (Wang and Wu, 2019), double horizontal well-fracture system (Xu et al, 2018), vertical well-fracture system (Lei et al, 2020), multi-well-fracture system , multilateral well-fracture system (Song et al, 2018), and Ushaped closed loop system (Sun et al, 2018). The effects of geological parameters, geometrical parameters, and operational parameters on EGS thermal recovery capability have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Parameter sensitivity and economic analyses of an interchange-fracture enhanced geothermal system

Liu

Zhang

et al. 2021

Adv. Geo-Energy Res.

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Previous research has shown that interchange-fracture enhanced geothermal systems show desirable heat extraction performance. However, their parameter sensitivity has not been systematically investigated. In this study, a three-dimensional, unsteady flow and heat transfer model for an enhanced geothermal system with an interchange-fracture structure was established. The influences of pivotal parameters, including stimulated reservoir volume permeability, fracture spacing, fracture aperture, and injection flow rate on the thermal extraction performance of the interchange-fracture enhanced geothermal system were systematically researched. In addition, the economics of this system were evaluated. The results show that the heat extraction performance of the interchange-fracture system is significantly affected by a change of stimulated reservoir volume permeability and injection flow rate. Increasing permeability reduces electricity costs and improves economic income, while increasing the injection flow rate increases output power but hinders the long-term running stability of the system. Our research provides guidance for the optimal design of an interchange-fracture enhanced geothermal system.

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Electricity generation from a three-horizontal-well enhanced geothermal system in the Qiabuqia geothermal field, China: Slickwater fracturing treatments for different reservoir scenarios

Cited by 102 publications

References 29 publications

Hydraulic Fracturing in Enhanced Geothermal Systems—Field, Tectonic and Rock Mechanics Conditions—A Review

Hydraulic Fracturing in Enhanced Geothermal Systems—Field, Tectonic and Rock Mechanics Conditions—A Review

The Concept, Technical System and Heat Transfer Analysis on Phase-Change Heat Storage Backfill for Exploitation of Geothermal Energy

Parameter sensitivity and economic analyses of an interchange-fracture enhanced geothermal system

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