Abstract
It is possible to engineer and control the extents of the stimulation rock volume for hydraulic fracturing. Currently, available tools and methods intended to accomplish this task focus on optimizing injection fluid properties, utilizing existing rock stress boundaries, controlling stimulation intervals in the injection well, and manipulating injection pressures and rates. What if it were possible to control hydraulic fracture extents more directly than these methods do and to have confirmation of these extents in the subsurface? For this, we propose a ‘fracture caging’ concept where an array of injection wells and production wells are drilled prior to stimulation as a means to identify and control the extent of a stimulated zone. Positive identification of stimulation extents occurs by monitoring production well pressures and flow rates. Control of fracture extents occurs by control of the production well pressures and arrangement of production wells so as to contain an intended stimulated zone. In this study, we present the fracture caging concept and validate it with laboratory experiments. Numerical modelling with LLNL’s GEOS code is used to predict the effectiveness of the fracture caging concept as it applies to the SIGMA-V (EGS Collab) geothermal energy research field site.
Original language | English |
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State | Published - 2018 |
Event | 52nd U.S. Rock Mechanics/Geomechanics Symposium - Seattle, United States Duration: Jun 17 2018 → Jun 20 2018 |
Conference
Conference | 52nd U.S. Rock Mechanics/Geomechanics Symposium |
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Country/Territory | United States |
City | Seattle |
Period | 06/17/18 → 06/20/18 |
Funding
The experimental work was supported in part by Colorado School of Mines though financial support provided by the U.S. Department of Energy under DOE Grant No. DE-FE0002760. This support is gratefully acknowledged. The EGS Collab work in this study is supported by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (GTO) under Contract No. DE-AC52-06NA25396 with Los Alamos National Laboratory and under Contract No. DE-AC52-07NA2734-I with Lawrence Livermore National Security, LLC, as led by Contract No. DEAC02-05CH11231 with Lawrence Berkeley National Laboratory, and in partnership with different contract numbers with other national laboratories. Research supporting this work took place in whole or in part at the Sanford Underground Research Facility in Lead, South Dakota. The assistance of the Sanford Underground Research Facility and its personnel in providing physical access and general logistical and technical support is acknowledged.
Funders | Funder number |
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U.S. Department of Energy | |
Office of Energy Efficiency and Renewable Energy | |
Los Alamos National Laboratory | |
Colorado School of Mines | |
Geothermal Technologies Office | DE-AC52-06NA25396 |
Geothermal Technologies Office |