Journal
PROCESSES
Volume 9, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/pr9050744
Keywords
vertical permeability heterogeneity; reservoir permeability; enhanced geothermal system; electricity generation performance; Yangbajing geothermal field
Categories
Funding
- GDAS' Project of Science and Technology Development [2020GDASYL-20200102020, 2020GDASYL-20200102013, 2020GDASYL-20200301003, 2020GDASYL-20200402003, 2020GDASYL-20200302007, 2019GDASYL-0102002]
- Guangdong Foundation for Program of Science and Technology Research [2019B121205006, 2019B121201004]
- National Natural Science Foundation of China [NSFC: 41930865]
- Open Foundation of Key Laboratory of Natural Gas Hydrate, CAS [E0290206]
- Northern Guangdong Soil Environment Observation and Research Station
- Guangdong Engineering Center of Non-point Source Pollution Control
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The vertical permeability heterogeneity in stratified formations significantly influences the electricity generation performance of enhanced geothermal systems, affecting water production rate, electric power, reservoir impedance, and pump power. However, vertical permeability heterogeneity is not the main factor affecting injection pressure and energy efficiency in the system.
Because geologic sedimentation and hydrofracturing processes are not homogeneous, the reservoirs of enhanced geothermal systems (EGSs) are also heterogeneous; this has a significant influence on the electricity generation performance of EGS. Presently, there are a lack of systematic and profound studies on the effect of vertical permeability heterogeneity in stratified formation on the electricity generation performance of EGS. In order to uncover the effect of vertical permeability heterogeneity on electricity generation performance of EGS, in this work we analyzed the influence of vertical permeability heterogeneity on electricity generation performance of EGS through a numerical method based on geological data at the Yangbajing geothermal field. The results indicate that when the average permeability of stratified formations is constant for a homogeneous reservoir, the system attains maximum water production rate, maximum electric power, minimum reservoir impedance and maximum pump power; with the increasing of the vertical permeability heterogeneity, the water production rate gradually decreases, the electric power gradually declines, the reservoir impedance gradually increases and the pump power gradually declines. When the average permeability of stratified formations is constant, with the increasing of the vertical permeability heterogeneity, the injection pressure and energy efficiency only changes very slightly; this indicates that the vertical permeability heterogeneity is not the main factor affecting the system injection pressure and energy efficiency.
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