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

Development of deep high-temperature heat reservoir at Yangbajing geothermal field has very important significance for capacity expanding and sustaining of the ground power plant. The geological exploration found that there is a fractured granite heat reservoir with an average temperature of 248 deg...

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Bibliographic Details
Published in:Energy
Main Authors: Zeng, Yu-Chao, Wu, Neng-You, Su, Zheng, Hu, Jian
Format: Article in Journal/Newspaper
Language:English
Published: 2014
Subjects:
Single Horizontal Well
Electricity Generation Potential
Fractured Granite Reservoir
Water Mining
Yangbajing Geothermal Field
Science & Technology
Physical Sciences
Technology
Thermodynamics
Energy & Fuels
HOT DRY ROCK
GAS-PRODUCTION
QILIAN MOUNTAIN
HEAT EXTRACTION
WORKING FLUID
CHINA
PERMAFROST
RESOURCE
SYSTEMS
EGS
permafrost
Online Access:http://ir.giec.ac.cn/handle/344007/10761
https://doi.org/10.1016/j.energy.2013.10.084
Description
Summary:Development of deep high-temperature heat reservoir at Yangbajing geothermal field has very important significance for capacity expanding and sustaining of the ground power plant. The geological exploration found that there is a fractured granite heat reservoir with an average temperature of 248 degrees C at depth of 950 similar to 1350 m in well ZK4001 in the north of the geothermal field. In this work, a simplified conceptual model of the 950 similar to 1350 m reservoir is established based on all the existing geological data, and the electricity generation potential from this fractured granite reservoir by geothermal water mining through a single horizontal well is numerically simulated. The results indicate that the single horizontal well system attains an electric power of 3.23 similar to 3.48 MW and an energy efficiency of about 50.00 similar to 17.16 during 20 years under reference conditions. The main parameters that affect the heat extraction and electricity generation are reservoir porosity, permeability and water production rate. Higher porosity or higher permeability or higher water production rate will be favorable for improving the electricity generation performance, under the precondition of not arousing vaporization and precipitation in the liquid water saturated reservoir. (C) 2013 Elsevier Ltd. All rights reserved.

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