Winning teams have been announced in the 2019 Geothermal Design Challenge™ Data Visualization contest. The U.S. Department of Energy (DOE) Geothermal Technologies Office (GTO), in partnership with the Frontier Observatory for Research in Geothermal Energy (FORGE) and the Idaho National Laboratory (INL), hosted the student competition that launched in January and concluded in April. The student competition challenged teams to research FORGE data, interpret information and create a data visualization portfolio that recommended a location within the FORGE footprint where an enhanced geothermal reservoir could be created with minimal environmental consequences.
Professor Ghassemi’s group focuses on understanding the dynamics of reservoir rocks and fracture networks in response to hydraulic, poroelastic, thermal, and chemical stimulations. The aim of this work is to facilitate economic production of the nation's vast geothermal resources through development of effective completions and stimulation techniques. Active topics of research include:
- Stimulation Optimization using Geologic and Geomechanics Principles
- Modeling Fracture Clusters in Geothermal Reservoirs
- Geomechanics-Based Stochastic Analysis of Injection-Induced Seismicity
- Variation of In-situ Stress, and Fracture Slip in Response to Injection/Production
- Optimum Wellbore Trajectory and Wellbore Stability Analysis
- Experimental and Numerical Investigation of Coupled Poro-thermo-chemo-mechanical Analysis of Fracture Permeability
This research is conducted in partnership with the geothermal industry, and in collaboration with the National Laboratories.
Professor Ghassemi’s research at Utah FORGE addresses reservoir characterization, hydraulic fracturing design, diagnostic fracture induced testing (DFIT) in fracture rock, and other stress in-situ stress determination methods. In addition to providing experimental expertise to assess rock and fracture characteristics, and the potential impact of shear and mixed-mode stimulation, we contribute to stimulation design optimization using the GeoFrac family of thermo-poromechanical hydraulic fracturing and fracture network models that have been developed for large-scale studies. The 2D version of GeoFrac considers rock anisotropy and natural fractures including their slip and propagation to form a network. The 3D version called GeoFeac3D incorporates rock heterogeneity and non-linearity, allows for poroelasticity, thermoelasticity, and mixed-mode propagation, and can be used to model multiple hydraulic fractures involving proppant transport and heat extraction. These will be used to help future stimulation design at FORGE.
The RGSR group has a world-class rock mechanics facility consisting of a number of MTS Material Testing Systems, 3 Polyaxial Testing units, 1 TTK Triaxial Test System, 1 Creep Test System, 1 API Fracturing Conductivity Test System, 3D laser Scanning System, etc. In addition to conventional rock mechanics testing such as uniaxial/triaxial compressive, static/dynamic, tensile strength, AE monitoring, hardness, fracture conductivity, advanced/novel rock mechanics tests are used to evaluate large-scale hydraulic fracturing under true triaxial conditions, tracer performance, high temperature and high pressure effects, triaxial shear, direct shear, and fracture propagation and coalescence. Currently, there are nine graduate students and two post-docs involved in the modeling and experimental work in the group.
The snow is receding and the drilling of two new monitor wells for the Utah FORGE laboratory starts this week. The first well is being drilled to 1000’ and the second well will go to 3000’. Both are situated near the existing deep well, 58-32, that was completed in 2017. The new wells being much shallower, should be completed by early April, when they will be instrumented with state of the art sensors. During the drilling process, geologists and engineers will be on site, in order to provide important information about rock types and shallow groundwater resources.
For background, this phase of work involves bringing the site up to readiness to drill the two deep wells later in the year that will become the centerpiece of the FORGE laboratory. In the short term, activities are focused on:
- installation of a permanent seismic monitoring network
- building infrastructure (power, site office, communications hub, upgraded roads)
- mini-flow injection testing and interpretation of results
- acquiring additional field data to refine geoscientific understanding
- convening of the Science & Technology Analysis Team (STAT).
Several of the Utah FORGE team members attend the 2018 American Geophysical Union Meeting (AGU) in December.