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Title of Journal: Rock Mech Rock Eng

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Abbravation: Rock Mechanics and Rock Engineering

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Springer Vienna

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DOI

10.1002/bapi.201390007

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1434-453X

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Analysis of the Thermal and Hydraulic Stimulation

Authors: Jacob Bradford John McLennan Joseph Moore Robert Podgorney Mitchell Plummer Greg Nash
Publish Date: 2017/01/05
Volume: 50, Issue: 5, Pages: 1279-1287
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Abstract

The Raft River geothermal field located in southern Idaho roughly 100 miles northwest of Salt Lake City is the site of a Department of Energy Enhanced Geothermal System project designed to develop new techniques for enhancing the permeability of geothermal wells RRG9 ST1 the target stimulation well was drilled to a measured depth of 5962 ft and cased to 5551 ft The openhole section of the well penetrates Precambrian quartzite and quartz monzonite The well encountered a temperature of 282 °F at its base Thermal and hydraulic stimulation was initiated in June 2013 Several injection strategies have been employed These strategies have included the continuous injection of water at temperatures ranging from 53 to 115 °F at wellhead pressures of approximately 275 psi and three shortterm hydraulic stimulations at pressures up to approximately 1150 psi Flow rates wellhead and line pressures and fluid temperatures are measured continuously These data are being utilized to assess the effectiveness of the stimulation program As of August 2014 nearly 90 million gallons have been injected A modified Hall plot has been used to characterize the relationships between the bottomhole flowing pressure and the cumulative injection fluid volume The data indicate that the skin factor is decreased and/or the permeability around the wellbore has increased since the stimulation program was initiated The injectivity index also indicates a positive improvement with values ranging from 015 gal/min psi in July 2013 to 173 gal/min psi in February 2015 Absolute flow rates have increased from approximately 20 to 475 gpm by February 2 2015 Geologic downhole temperature and seismic data suggest the injected fluid enters a fracture zone at 5650 ft and then travels upward to a permeable horizon at the contact between the Precambrian rocks and the overlying Tertiary sedimentary and volcanic deposits The reservoir simulation program FALCON developed at the Idaho National Laboratory is being used to simulate and visualize the effects of the injection The simulation model uses a discrete fracture network generated for RRG9 using acoustic borehole imaging and analysis of microseismic activity By adjusting the permeability of the fractures a pressure history match for the first part of the stimulation program was obtained The results of this model indicate that hydraulic fracturing is the dominant mechanism for permeability improvement for this part of the stimulation program


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Other Papers In This Journal:

  1. Development of Rock Engineering Systems-Based Models for Flyrock Risk Analysis and Prediction of Flyrock Distance in Surface Blasting
  2. Borehole Instability in Malmberget Underground Mine
  3. The Use of Infrared Thermography for Porosity Assessment of Intact Rock
  4. A nonlinear criterion for triaxial strength of inherently anisotropic rocks
  5. Modeling of Shales in Salt-Hydrocarbon Systems
  6. An Example of Realistic Modelling of Rock Dynamics Problems: FEM/DEM Simulation of Dynamic Brazilian Test on Barre Granite
  7. Comprehensive Stability Evaluation of Rock Slope Using the Cloud Model-Based Approach
  8. Wear Performance of Saw Blades in Processing of Granitic Rocks and Development of Models for Wear Estimation
  9. Determination of Poisson’s Ratio of Rock Material by Changing Axial Stress and Unloading Lateral Stress Test
  10. Hollow Cylinder Simulation Experiments of Galleries in Boom Clay Formation
  11. Micromechanical Modelling of Stress Waves in Rock and Rock Fractures
  12. ISRM Suggested Method for Monitoring Rock Displacements Using the Global Positioning System (GPS)
  13. Determination of Geometrical and Structural Representative Volume Elements at the Baihetan Dam Site
  14. Determination of Geometrical and Structural Representative Volume Elements at the Baihetan Dam Site
  15. Microseism Induced by Transient Release of In Situ Stress During Deep Rock Mass Excavation by Blasting
  16. Some Open Issues on Rockfall Hazard Analysis in Fractured Rock Mass: Problems and Prospects
  17. Connectivity of Three-Dimensional Fracture Networks: A Case Study from a Dam Site in Southwest China
  18. Evaluating Variability and Uncertainty of Geological Strength Index at a Specific Site
  19. Hybrid Finite-Discrete Element Simulation of the EDZ Formation and Mechanical Sealing Process Around a Microtunnel in Opalinus Clay
  20. Experimental Anelastic Strain Recovery Compliance of Three Typical Rocks
  21. Significance of Geological Parameters for Predicting Water Inflow in Hard Rock Tunnels
  22. A Morphological Visualization Method for Removability Analysis of Blocks in Discontinuous Rock Masses
  23. Effects of Heat Shock on the Dynamic Tensile Behavior of Granitic Rocks
  24. New Rapid Evaluation for Long-Term Behavior in Deep Geological Repository by Geotechnical Centrifuge. Part 1: Test of Physical Modeling in Near Field Under Isotropic Stress-Constraint Conditions
  25. Slope Failures in the Opencast Coal Mines of Wardha Valley Coalfield in Central India: A Study
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  27. Numerical Assessment of the Progressive Rock Fracture Mechanism of Cracked Chevron Notched Brazilian Disc Specimens
  28. Algorithmic Simulation of Flow in Rock Fractures

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