Modeling Responses of Naturally Fractured Geothermal Reservoir to Low-Pressure Stimulation

Abstract

Hydraulic shearing is an appealing reservoir stimulation strategy for Enhanced Geothermal Systems. It is believed that hydro-shearing is likely to simulate a fracture network that covers a relatively large volume of the reservoir whereas hydro-fracturing tends to create a small number of fractures. In this paper, we examine the geomechanical and hydraulic behaviors of natural fracture systems subjected to hydro-shearing stimulation and develop a coupled numerical model within the framework of discrete fracture network modeling. We found that in the low pressure hydro-shearing regime, the coupling between the fluid phase and the rock solid phase is relatively simple, and the numerical model is computationally efficient. Using this modified model, we study the behavior of a random fracture network subjected to hydro-shearing stimulation.

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Additional Info

DOE Project Name: Stimulation of Complex Fracture Systems in Low Pressure Reservoirs for Development of Enhanced Geothermal Systems
DOE Project Number: AID 19979
DOE Project Lead: Eric Hass
DOI: 10.15121/1358114
Last Updated: over a year ago
Jan
2012
Data from January, 2012
Submitted Feb 7, 2013

Contact

Lawrence Livermore National Laboratory


Status

Publicly accessible License 

Authors

Pengcheng Fu
Lawrence Livermore National Laboratory
Charles R. Carrigan
Lawrence Livermore National Laboratory

Keywords

geothermal, hydraulic fracturing, hydraulic shearing, reservoir stimulation, reservoir modeling, discrete fracture network, enhanced geothermal system, egs, hydro-shearing

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