A5059768139- Hydraulic Fracturing and Reservoir Analysis
- Energy and Environment Impacts
- Global Energy and Sustainability Research
- Global Energy Security and Policy
- Seismic Imaging and Inversion Techniques
- Electric Power System Optimization
- Groundwater flow and contamination studies
- Drilling and Well Engineering
- Climate Change Policy and Economics
- State Capitalism and Financial Governance
- Energy, Environment, and Transportation Policies
- Reservoir Engineering and Simulation Methods
- Nuclear and radioactivity studies
- Rock Mechanics and Modeling
- Private Equity and Venture Capital
- earthquake and tectonic studies
- Water-Energy-Food Nexus Studies
- Seismic Waves and Analysis
- Financial Markets and Investment Strategies
- Environmental Impact and Sustainability
- Geophysical and Geoelectrical Methods
- Integrated Energy Systems Optimization
- Water resources management and optimization
- Geothermal Energy Systems and Applications
- Global Financial Crisis and Policies
GEO Partner (Switzerland)
2013-2024
Steinbeis Foundation
2003-2012
Agence Nationale pour la Gestion des Déchets Radioactifs
1999-2002
Universitat Politècnica de Catalunya
1999-2001
GTx (United States)
2001
Energy International (United States)
2000
World Bank
1990-1995
Innovative Design Engineeering & Analysis (United States)
1987-1994
Stony Brook University
1984-1987
State University of New York
1984-1987
Most pumping tests are interpreted using the classical Theis assumption of large‐scale homogeneity with various corrections to account for early time behavior drawdown curves. When drawdowns plotted versus log time, late data often delineate a straight line, which is consistent Jacob's approximation Theis' solution but may seem surprising in view heterogeneity natural media. The aim our work show that method leads good effective transmissivity heterogeneous media when constrained data. A...
Large-magnitude fluid-injection induced seismic events are a potential risk for geothermal energy developments worldwide. One mitigation measure is the application of cyclic injection schemes. After validation at small (laboratory) and meso (mine) scale, concept has now been applied first time field scale Pohang Enhanced Geothermal System (EGS) site in Korea. From 7 August until 14 2017 total 1756 m³ surface water was injected into well PX-1 flow rates between 1 10 l s–1, with maximum...
Abstract. The increased interest in subsurface development (e.g., unconventional hydrocarbon, engineered geothermal systems (EGSs), waste disposal) and the associated (triggered or induced) seismicity calls for a better understanding of hydro-seismo-mechanical coupling fractured rock masses. Being able to bridge knowledge gap between laboratory reservoir scales, controllable meso-scale situ experiments are deemed indispensable. In an effort access instrument masses hectometer size, Bedretto...
Interpretation of pumping tests to estimate hydraulic parameter values is typically based on the assumption aquifer homogeneity. The applicability traditional methods interpretation in real aquifers can be questioned, since evaluation drawdown curves observed at different locations a single test may not result one consistent set parameters. Thus most hydrogeologists tend look estimated transmissivities ( T ) as some average property medium, while storativities S are disregarded cases,...
Multicriteria decision making (MCDM) methods are widely used for comparing alternatives when there multiple objectives. For instance, utilities use them resource bidding, externality quantification, facility siting, and planning. There many alternative methods, differing in their ease of use, validity, results, appropriateness to Several MCDM compared an experiment involving the choice portfolio Seattle City Light. Planners interest group representatives applied direct weight assessment,...
We present key observations and analyses of the first second stimulations conducted at Pohang enhanced geothermal system (EGS) site in Korea 2016. The hydraulic stimulation was PX-2 well 4.3 km depth, with maximum wellhead pressure 89.2 MPa, injection rate 46.8 L/s, a total injected volume 1970 m3. showed non-linear reversible fracture-opening behavior increase. mechanism is interpreted as combination tensile fracture extension jacking. PX-1 4.2 27.7 18.0 3907 evaluated from clear peaks...
Abstract We present evidence of permeability enhancement from hydraulic stimulation experiments in fractured crystalline rock. A total 9.49 m 3 was injected two intervals a 300 long borehole. Repeated Ground Penetrating Radar (GPR) measurements the same borehole were carried out prior to and following stimulation. The initial revealed fractures vicinity that could be traced up distances 50 away. data measured post‐stimulation used difference‐imaging approach illuminate changes GPR...
Hydraulic stimulation of Enhanced Geothermal Systems (EGS) aims at boosting permeability to facilitate fluid circulation, while keeping a low induced seismicity. However, some stimulations have led poor enhancement or too high earthquakes, which suggests that further understanding is needed on poromechanical processes during stimulation. Here, we model highly-monitored test performed the Bedretto Underground Laboratory investigate impact injection and microseismicity. We examine three...
In this study, we investigate numerically the hydro-mechanical behavior of fractured crystalline rock due to one five hydraulic stimulations at Pohang Enhanced Geothermal site in South Korea.We use commercial code FracMan (Golder Associates) that enables studying coupled processes media three dimensions combining finite element method with a discrete fracture network.The software is used simulate fluid pressure perturbation fractures during stimulation.Our numerical simulation shows history...
Abstract Cross‐hole pumping tests within a subvertical shear zone in granite were interpreted using geostatistical inverse approach. The objective was to identify flow channels that influence tracer experiments. spatial correlation structure of transmissivity (T) unknown. Therefore, wide variety hypotheses made for estimating total 40 T fields, honor equally well the tests, static head measurements, and point data. All estimated fields reveal with similar topology preferred horizontal...
Abstract Specific capacity (Q/s) data are usually much more abundant than transmissivity (T) data. Theories which assume uniform predict a nearly linear relationship between T and Q/s. However, dependence is seldom observed in field studies. Since hydrogeologic studies require data, many hydrogeologists use regression analysis of versus Q/s to estimate values where only available. In this paper we numerical models investigate the effects aquifer heterogeneity on estimates. The simulations...
Abstract Harmonic Pulse Testing (HPT) has been developed as a type of well testing applicable during ongoing field operations because pulsed signal is superimposed on background pressure trend. Its purpose to determine and formation parameters such wellbore storage, skin, permeability, boundaries within the investigated volume. Compared conventional testing, HPT requires more time investigate same reservoir The advantage that it does not require interruption injection/production before...