Advances in New and Renewable Energy >
Laboratory-scale Hydraulic Fracturing Research and Injection Tests of Enhanced Geothermal System
Received date: 2014-07-24
Revised date: 2014-10-08
Online published: 2014-12-30
Enhanced geothermal system (EGS), as an important direction for new and clean energy development, is gaining increasing attentions across the world. Direct engineering practice research in field test site and theoretical analysis by numerical simulation are mainly two kinds of EGS research methods. We conducted laboratory-scale tests for EGS research. The hydraulic fracturing of rocks was performed and the fracture structures were identified by using the acoustic emission data. Valid heat reservoir of hydraulic connection from the injection well to the production well through the fractures is obtained after the installation of the production. Then we performed the injection tests in the heat reservoir at a constant pressure of constant flow rate. It is found that the fracture apertures of reservoir vary with the injection conditions. A higher pressure or a larger flow rate leads to larger fracture apertures. In order to enhance the reservoir permeability, the fractures in reservoir should be reinforced in higher pressure condition for which the reservoir permeability is relatively large.
GUO Jian , WANG Yi-wei , CAO Wen-jiong , JIANG Fang-ming . Laboratory-scale Hydraulic Fracturing Research and Injection Tests of Enhanced Geothermal System[J]. Advances in New and Renewable Energy, 2014 , 2(6) : 434 -440 . DOI: 10.3969/j.issn.2095-560X.2014.06.005
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