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Sensitivity analysis of coupled processes and parameters on the performance of enhanced geothermal systems.

Abstract：

:3-D modeling of coupled thermo-hydro-mechanical (THM) processes in enhanced geothermal systems using the control volume finite element code was done. In a first, a comparative analysis on the effects of coupled processes, operational parameters and reservoir parameters on heat extraction was conducted. We found that significant temperature drop and fluid overpressure occurred inside the reservoirs/fracture that affected the transport behavior of the fracture. The spatio-temporal variations of fracture aperture greatly impacted the thermal drawdown and consequently the net energy output. The results showed that maximum aperture evolution occurred near the injection zone instead of the production zone. Opening of the fracture reduced the injection pressure required to circulate a fixed mass of water. The thermal breakthrough and heat extraction strongly depend on the injection mass flow rate, well distances, reservoir permeability and geothermal gradients. High permeability caused higher water loss, leading to reduced heat extraction. From the results of TH vs THM process simulations, we conclude that appropriate coupling is vital and can impact the estimates of net heat extraction. This study can help in identifying the critical operational parameters, and process optimization for enhanced energy extraction from a geothermal system.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Pandey SN,Vishal V

doi

10.1038/s41598-017-14273-4

subject

Has Abstract

pub_date

2017-12-06 00:00:00

pages

17057

issue

1

issn

2045-2322

pii

10.1038/s41598-017-14273-4

journal_volume

7

pub_type

杂志文章

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