A5002402674- Drilling and Well Engineering
- Hydraulic Fracturing and Reservoir Analysis
- Seismic Imaging and Inversion Techniques
- Rock Mechanics and Modeling
- Hydrocarbon exploration and reservoir analysis
- Geotechnical and Geomechanical Engineering
- Mineral Processing and Grinding
- Tunneling and Rock Mechanics
- earthquake and tectonic studies
- Enhanced Oil Recovery Techniques
- Rheology and Fluid Dynamics Studies
- Geochemistry and Geologic Mapping
- Geological Modeling and Analysis
- Polymer crystallization and properties
- Seismic Waves and Analysis
- Geological and Geochemical Analysis
- Geophysical Methods and Applications
- Geotechnical Engineering and Underground Structures
- Oil and Gas Production Techniques
- Grouting, Rheology, and Soil Mechanics
- Spacecraft and Cryogenic Technologies
- Industrial Vision Systems and Defect Detection
- Elasticity and Material Modeling
- Coal Properties and Utilization
- Plasma and Flow Control in Aerodynamics
ExxonMobil (Germany)
2004-2024
ExxonMobil (United States)
2005-2023
Queen's University Belfast
2005-2009
University of Manchester
2008
University of Chicago
2006
American Institute of Physics
2006
American Chemical Society
2006
American Academy of Pediatrics
2006
Faculty of 1000 (United States)
2006
Heriot-Watt University
1994-1999
Abstract The use of hydraulic fracturing to recover shale gas has focused attention on the fundamental fracture properties gas‐bearing shales, but there remains a paucity available experimental data their mechanical and physical properties. Such shales are strongly anisotropic, so that propagation trajectories depend interaction between anisotropic in situ stress field shallow crust. Here we report toughness measurements Mancos determined all three principal orientations: Divider, Short...
The strength and permeability of fault zones must be quantified in order to accurately predict crustal subsurface fluid migration. To this end, we performed experiments on mixtures fine‐grained quartz kaolinite incremented at 10 wt% intervals between the two end‐member components (analogues for natural gouge) establish their flow properties during hydrostatic shear loading. Hydrostatically compacted samples exhibited reduction increasing effective pressures from 5 MPa 50 MPa, with rate...
An accurate predictive model for the long‐term strength of continental lithosphere is important in a range geophysical and geodynamic problems. While laboratory experiments are consistent with Mohr‐Coulomb brittle faulting cold, upper crust, there increasing evidence that time‐dependent processes may also be these rocks, even at low temperature. However, some ambiguity as to exact form constitutive law describing behavior crustal rocks. Here we present results room temperature creep on suite...
Abstract The rock mechanical behaviour of reservoir rocks is important in the design and implementation drilling production programmes. Traditionally properties are obtained from direct measurement on core samples or calculations acoustic wireline log measurements. This paper reports many different porosities. has led to development a new method predicting directly porosity. discusses experimentally derived porosity, elastic moduli fracture strength parameters intetpretation these results...
Abstract Fracture toughness was measured for a range of rock materials as function temperature between ambient and 150°C. Measurements were made along all three principal crack orientations the transversely isotropic Mancos shale in single more Darley Dale sandstone, Indiana limestone Lanhelin granite. using modified short-rod method with sample loading equipment enclosed within an elevated chamber. A slight increase K Ic observed granite increasing temperatures up to 54°C, before steady...
Abstract An experimental rock mechanics facility was used to assess the finite permeability of shear bands artificially induced in cylindrical core plugs high porosity sandstone under triaxially compressive stress states varying magnitude. A method estimating band from axial transient pulse-decay measurements is presented, based on certain assumptions including a linear thickness decrease with resolved normal across fault. Computed reductions range 2.5 3.5 orders magnitude, cataclastic...
The formation and evolution of faulting in three initially intact, oil-saturated specimens Clashach sandstone is examined under conditions constant strain rate loading at different confining pressures, simulating the effect tectonic depths Earth's upper crust. After a fault formed are slid for time, then initial pressure increased to simulate long-term recovery strength expected Earth. differential stress s natural acoustic emissions (AE) measured during separate phases nucleation, sliding...
Abstract We have performed a series of coupled deformation and permeability experiments on "synthetic" fault gouge to investigate the influence "shaliness" fluid flow properties. Biminerallic layers were sheared between steel sliders under triaxial compression measured continuously using pore pressure oscillation technique. Permeability was observed range over six orders magnitude depending clay content sliding. Measured porosity variations, post-test laser particle sizing direct observation...
Abstract Pore collapse and the plastic behavior of high porosity chalks is well known but extent to which harder, more moderate carbonates are not as clear. We have experimentally determined elastic deformation effect that on permeability for a suite carbonate rocks spanning range 14% 42%. The depositional environment was shallow marine reef with some secondary development. Biaxial compression tests were carried out along various stress paths where ratio axial radial effective change kept...
Abstract Significant rock strength anisotropy associated with weak bedding laminations in shale can lead to wellbore instability challenges especially when drilling Extended Reach Drilling (ERD) wells that require low angles of attack relative the formation planes. Past experience water-based muds offshore Abu Dhabi showed a high frequency hole-cleaning and stuck-pipe events for deviated above approximately 40° from vertical. This was attributed due invasion fluids into micro-fractures along...
Hydraulic fracture treatment of Gas-Shales is increasingly being investigated across Europe. Understanding the propagation hydraulic fractures under in-situ conditions important for design, both to maximise gas accessed, and minimise risk overextension. Fractures will always propagate along path least resistance, but direction extent this a complex relationship between stress-field, anisotropic mechanical properties rock, pore fracturing pressures. The gas-shales remain poorly constrained....
Abstract The "critical state" concept of elastoplastic constitutive behavior has been utilized extensively to model the stress-strain response many geomaterials that undergo plastic yielding. This paper uses a critical state investigate deformation and deformation-induced permeability changes observed in laboratory experiments conducted on siliciclastic carbonate petroleum-reservoir rocks. We find shape yield surface significant impact post-yield fluid flow response. Differences between rock...