Geothermal Energy Exploitation and Power Generation via a Single Vertical Well Combined with Hydraulic Fracturing

2022 ◽  
Vol 148 (1) ◽  
Author(s):  
Guodong Cui ◽  
Wenxiong Wang ◽  
Bin Dou ◽  
Yunfeng Liu ◽  
Hong Tian ◽  
...  
Keyword(s):  
Power Generation ◽  
Hydraulic Fracturing ◽  
Geothermal Energy ◽  
Vertical Well ◽  
Energy Exploitation

scholarly journals Research on a Coupled Total-Flow and Single-Flash (TF-SF) System for Power and Freshwater Generation from Geothermal Source

2020 ◽  
Vol 10 (8) ◽  
pp. 2689 ◽  
Author(s):  
Guopeng Yu ◽  
Zhibin Yu
Keyword(s):  
Power Generation ◽  
Geothermal Energy ◽  
Energy Utilization ◽  
Condensation Process ◽  
Total Flow ◽  
Combined System ◽  
Geothermal Resources ◽  
Single Flash ◽  
System Output ◽  
Efficiency Effects

In response to the twin development challenges of energy shortage and water-scarcity in worldwide arid to semi-arid regions with geothermal resources, a new combined power and freshwater generation system is proposed for geothermal energy utilization. In this system, a total-flow turbine (TF) is employed to be coupled with the traditional single-flash (SF) system and thereafter the coupled TF-SF system is investigated in this work. In addition to power generation, the exhaust steam from turbines are recovered to produce freshwater through condensation. Based on the novel designed system, the production of both power and water are studied under variable wellhead conditions, including variable wellhead pressures, temperatures, mass flowrates, and vapor qualities. The temperature of the separating point at which the total-flow expansion ends and the steam expansion starts is studied for optimal system output. In addition, the efficiency effects of the total-flow turbine on performance of the combined system is also investigated. The power generation comparison shows good power potential of the proposed TF-SF combined system. An effective total-flow turbine with an average efficiency of 65% can lead to an optimal power capacity, exceeding the traditional single-flash (SF) system by 23.7%. Moreover, more than 1/3 of total wellhead discharge can be recovered as desalinated freshwater by the naturally equipped condensation process of the power plant, showing extra benefit from geothermal energy utilization.

Elastoplastic constitutive model for hydraulic aperture analysis of hydro-shearing in geothermal energy development

SIMULATION ◽  
2018 ◽  
Vol 95 (9) ◽  
pp. 861-872
Author(s):  
Yong Xiao ◽  
Jianchun Guo ◽  
Hehua Wang ◽  
Lize Lu ◽  
Mengting Chen
Keyword(s):  
Shear Strength ◽  
Hydraulic Fracturing ◽  
Geothermal Energy ◽  
Energy Development ◽  
Green Energy ◽  
Shear Displacement ◽  
Natural Fracture ◽  
Roughness Coefficient ◽  
Fracture Simulation ◽  
Hydraulic Aperture

Geothermal energy is renewable, clean and green energy generated and stored in the Earth’s crust. The most important consideration for geothermal energy development in non-hydrothermal scenarios is the use of hydraulic fracturing technology to establish an effective network pathway to conduct fluid from injectors to producers. Hydraulic fracturing in geothermal wells is referred to as hydro-shearing and the aim is to improve the conductivity of natural fractures. In this paper, linear elastic constitutive relationships and shear strength of discontinuities in the pre-peak region are initially considered. Based on the dynamic frictional weakening, a proved conductive aperture and the post-peak elastoplastic constitutive models are proposed to analyze the deformation and conductivity of the natural fracture. Simulation research has shown that the joint compressive strength (JCS) mainly affects the shear displacement and hardly affects the dilation. The joint roughness coefficient (JRC) is more important for decreasing the shear strength and improves the dilation aperture. To no one’s surprise, reducing the effective normal stress is the best way for increasing the shear displacement, dilation and conductivity of the natural fracture. Almost 90% of the slip displacement and dilation occurs after fracture shear failure. This displacement not only increases the hydraulic conductivity of the fracture, but also reduces the required surface pumping pressure.

scholarly journals Synergy potential for oil and geothermal energy exploitation

2018 ◽  
Vol 212 ◽  
pp. 1433-1447 ◽  
Author(s):  
Zaman Ziabakhsh-Ganji ◽  
Hamidreza M. Nick ◽  
Marinus E. Donselaar ◽  
David F. Bruhn
Keyword(s):  
Geothermal Energy ◽  
Energy Exploitation

scholarly journals The case for enhanced coalbed methane using hydraulic fracturing in the geostructural belt

2018 ◽  
Vol 36 (6) ◽  
pp. 1629-1644 ◽  
Author(s):  
Guozhong Hu ◽  
Chao Sun ◽  
Mingfei Sun ◽  
Wei Qin ◽  
Jianshe Linghu
Keyword(s):  
Hydraulic Fracturing ◽  
Coalbed Methane ◽  
Pressure Control ◽  
Field Investigation ◽  
Gas Production ◽  
Control Flow ◽  
Location Selection ◽  
Vertical Well ◽  
Enhanced Coalbed Methane ◽  
Selection Of

Coal and gas outbursts mostly occur during mining at geostructural belts. Pre-drainage coalbed methane using hydraulic fracturing is one of the methods to prevent outbursts. However, the coal in geostructural belts is to be soft and crushed with special mechanical properties and pore structure. To explore the feasibility of hydraulic fracturing in geostructural belts, a field investigation on enhanced coalbed methane using hydraulic fracturing with vertical well was conducted at the Yangquan Coalfield, China. This case puts forward a method for the location selection of vertical well in geostructural belts. In addition, a triple-control technology for hydraulic fracturing, which is characterized by pressure control, flow control and sand ratio control of fracturing fluid, is presented. The results show that the average gas production and maximum gas drainage capacity of the test well were 5.67 and 12.88 times than those of the regular well, respectively, achieving good drainage effects.

413 Power Generation From Low Temperature Geothermal Energy

2000 ◽  
Vol 2000.53 (0) ◽  
pp. 109-110
Author(s):  
Ryo AKASAKA ◽  
Hiroshi SUZUKI ◽  
Kazuo HIROWATARI ◽  
Daisuke SONODA ◽  
Takehiro ITO
Keyword(s):  
Power Generation ◽  
Low Temperature ◽  
Geothermal Energy

scholarly journals Thermal conditions for geothermal energy exploitation in the Transcarpathian depression and surrounding units

2016 ◽  
Vol 46 (1) ◽  
pp. 33-49 ◽  
Author(s):  
Dušan Majcin ◽  
Roman Kutas ◽  
Dušan Bilčík ◽  
Vladimír Bezák ◽  
Ignat Korchagin
Keyword(s):  
Temperature Field ◽  
Heat Flow ◽  
Field Distribution ◽  
Geothermal Energy ◽  
Thermal Conditions ◽  
Flow Density ◽  
Heat Flow Density ◽  
Temperature Field Distribution ◽  
Energy Exploitation

Abstract The contribution presents the results acquired both by direct cognitive geothermic methods and by modelling approaches of the lithosphere thermal state in the region of the Transcarpathian depression and surrounding units. The activities were aimed at the determination of the temperature field distribution and heat flow density distribution in the upper parts of the Earth’s crust within the studied area. Primary new terrestrial heat flow density map was constructed from values determined for boreholes, from their interpretations and from newest outcomes of geothermal modelling methods based on steady-state and transient approaches, and also from other recently gained geophysical and geological knowledge. Thereafter we constructed the maps of temperature field distribution for selected depth levels of up to 5000 m below the surface. For the construction we have used measured borehole temperature data, the interpolation and extrapolation methods, and the modelling results of the refraction effects and of the influences of source type anomalies. New maps and other geothermic data served for the determination of depths with rock temperatures suitable for energy utilization namely production of electric energy minimally by the binary cycles. Consequently the thermal conditions were used to identify the most perspective areas for geothermal energy exploitation in the region under study.

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