Using Fully Coupled Hydro-Geomechanical Numerical Test Bed to Study Reservoir Stimulation with Low Hydraulic Pressure

Abstract
This paper documents our effort to use a fully coupled hydro-geomechanical numerical test bed to study using low hydraulic pressure to stimulate geothermal reservoirs with existing fracture network. In this low pressure stimulation strategy, fluid pressure is lower than the minimum in situ compressive stress, so the fractures are not completely open but permeability improvement can be achieved through shear dilation. We found that in this low pressure regime, the coupling between the fluid phase and the rock solid phase becomes very simple, and the numerical model can achieve a low computational cost. Using this modified model, we study the behavior of a single fracture and a random fracture network.
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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: 10.15121/1358112
Last Updated: over a year ago
Jan
2012
Data from January, 2012
Submitted Feb 7, 2013

Lawrence Livermore National Laboratory

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Authors

Pengcheng Fu
Lawrence Livermore National Laboratory
Scott M. Johnson
Lawrence Livermore National Laboratory
Charles R. Carrigan
Lawrence Livermore National Laboratory

Keywords

geothermal, reservoir modeling, hydraulic shearing, hydraulic fracturing, fracture, reservoir stimulation, low pressure, stimulation

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