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**Concept Tag**

- analysis (29)
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**File Type**

ARMA-96-1215

2nd North American Rock Mechanics Symposium

behaviour, contact, contact resistance, dilation, displacement, graphite, joint wall, material, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, resistance, rock joint, sample, shear, shear strength, shear stress, stress, surface, technique, test, Upstream Oil & Gas

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.35)

2.1 OBJECTIVE

ARMA-96-1543

2nd North American Rock Mechanics Symposium

borehole, center, change, experiment, fracture, image, Imaging, Kirchoff migration, method, microfracture, receiver, reflection, Reservoir Characterization, reservoir description and dynamics, rock, seismic processing and interpretation, source, surface, synthetic seismogram, trace, transducer, Upstream Oil & Gas, Wave

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

In the present study, the authors describe a method for a coupled analysis of saturated porous media together with the consideration of convection using the mixture theory, in which density and the coefficient of kinematic viscosity are treated to be depending on temperature variation. The density of water also considered to be a function of pore pressure. Then we performed a series of analyses for some typical situations. The results emphasis the importance of consideration of convection in heat transport. We further checked the effect of temperature and pore pressure on the density of water. It should be noted that the classical Boussinesq approximation implies the density depends only on the temperature change. However, we found out that the results are not different from those of the classical Boussinesq approximation.

In this paper, the authors present mass, momentum and energy conservation laws for fluid and skeleton to describe the coupled seepage, stress and thermal behavior of rock mass using the mixture theory. These governing equations include constitutive laws such as Darcy's law, Hooke's law and Fourier's law. It is assumed that water density depends on temperature and pressure. Darcy's law includes kinematic viscosity which is influenced by temperature variation to represent free convection. Finally, we carried out numerical analyses for shallow and deep underground which includes a heat source to clarify its influence on surrounding. It is shown that Boussinesq's approximation can represent free convection.

ARMA-96-1321

2nd North American Rock Mechanics Symposium

analysis, approximation, case, change, displacement, equation, excess pore, flow in porous media, Fluid Dynamics, free convection, ground, heat, heat conduction, heat source, law, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, seepage, stress, transport, Upstream Oil & Gas, water

SPE Disciplines:

Sharp, John M. (Department of Geological Sciences, The University of Texas) | Kreisel, Ilan (Department of Geological Sciences, The University of Texas) | Milliken, Kitty L. (Department of Geological Sciences, The University of Texas) | Mac, Robert E. (Texas Bureau of Economic Geology, The University of Texas) | Robinson, Neville I. (Division of Mathematics and Statistics, CSIRO,)

We model the solute transport with a combination of analytical and numerical models. Key parameters are shown to be the skin thickness and the ratios of skin-to-matrix porosities, diffusion coefficients, and retardation coefficients. In dual porosity media, back diffusion times are shown to be significantly longer than the initial exposure times of the solutes in the fractures. These phenomena indicate that remediation of contaminants or enhanced oil recovery may be more problematical than is commonly postulated. Wall rock alterations along fracture skins composed of vein fillings indicate that the fractures may have had several episodes of healing (filling with precipitants) followed by reopening. Therefore, the timing of natural fracturing events is important in fracture-dominated flow and transport because younger fractures may not have had time to develop an effective skin. Finally, fracture skins may significantly affect rock mass or soil stability by altering frictional and roughness coefficients and changing system permeabilities.

ARMA-96-1329

2nd North American Rock Mechanics Symposium

Brushy Canyon, coating, coefficient, diffusion coefficient, effect, environmental implication, flow in porous media, Fluid Dynamics, fracture, fracture skin, fracture surface, hydraulic fracturing, matrix, permeability, porosity, reservoir description and dynamics, sandstone, solute transport, transport, Upstream Oil & Gas, well completion

Oilfield Places:

- North America > United States > Wyoming > Wind River Basin (0.99)
- North America > United States > Texas > Permian Basin (0.99)
- North America > United States > Texas > Canyon Formation (0.99)
- (2 more...)

SPE Disciplines:

Shi, J.Q. (Department of Earth Resources Engineering, Royal School of Mines, Imperial College of Science, Technology and Medicine) | Durucan, S. (Department of Earth Resources Engineering, Royal School of Mines, Imperial College of Science, Technology and Medicine) | Daltaban, T.S. (Department of Earth Resources Engineering, Royal School of Mines, Imperial College of Science, Technology and Medicine)

ARMA-96-1059

2nd North American Rock Mechanics Symposium

cavity, coal bed methane, coal seam gas, coalbed methane, cohesion, completion, complex reservoir, equation, failure, flow in porous media, Fluid Dynamics, formation evaluation, model, Openhole Cavity Completion, permeability, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, residual cohesion, shear, shear failure, strength, stress, tensile, Upstream Oil & Gas, well

Oilfield Places:

- North America > United States > New Mexico > San Juan Basin (0.99)
- North America > United States > Colorado > San Juan Basin (0.99)
- North America > United States > Colorado > Piceance Basin > Greater Grand Valley Field Complex Field > Williams Fork Formation (0.97)

SPE Disciplines:

- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Coal seam gas (1.00)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management (1.00)

UK Nirex Limited (Nirex) has applied for permission to construct a Rock Characterisation Facility (RCF) at Sellafield in Cumbria (UK). The RCF is part of the extensive science programme that will enable Nirex to decide whether or not to make a planning application to develop a deep repository for disposal of radioactive waste at Sellafield. The RCF will provide data on the characteristics of the potential host rocks. Three phases are planned. Phase 1 comprises construction of two shafts, and connection of the shafts at depth. Phases 2 and 3 involves construction of underground galleries and an intensive programme of scientific investigation. All three phases integrate a range of scientific activities within construction.

This paper describes the geotechnical data acquisition to be undertaken within Phase 1 of the proposed RCF. Geotechnical data are required to increase our knowledge, and validate models, of the development of the Excavation Disturbed Zone.

2.1 The need for an RCF

ARMA-96-1367

2nd North American Rock Mechanics Symposium

array, borehole, characterisation, construction, excavation, experiment, facility, gallery, health safety security environment and social responsibility, investigation, Nirex, north shaft, programme, RCF, repository, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, Response, rock, sector, Sellafield, shaft, Upstream Oil & Gas

SPE Disciplines:

Mokhel, A.N. (The Institute for Problems in Mechanics, Russian Academy of Sciences) | Kulinich, Yu (The Institute for Problems in Mechanics, Russian Academy of Sciences) | Germanovich, L.N. (Rock Mechanics Institute, The University of Oklahoma) | Dyskin, A.V. (Geomechanics Group, The University of Western Australia) | Galybin, A.N. (Geomechanics Group, The University of Western Australia)

ARMA-96-1285

2nd North American Rock Mechanics Symposium

Artificial Intelligence, borehole, breakout, concentration, condition, crack, direction, failure, fault, free surface, Germanovich, growth, instability, mechanism, propagation, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock, shear, situ stress, slip, stress, system, Upstream Oil & Gas, Wellbore Design, wellbore integrity

SPE Disciplines:

Fracture coalescence has been investigated on a variety of model rock specimens. The specimens contain two preexisting fractures which are either open or closed, and which are arranged at different distances and angles. Uniaxial and biaxial loading are applied. A biaxial machine was especially designed and built for this investigation. During the loading process crack initiation, propagation, and coalescence are observed. In the uniaxial tests, wing cracks and secondary cracks appear at the same time; wing cracks from open flaws initiate at 45 with respect to the loading direction, while secondary cracks initiate parallel to the flaw. In biaxial tests, wing cracks occur in the center of preexisting fractures or not at all. This research, as well as previous work at M.I.T confirm that secondary cracks which are often shear cracks play a very important role in crack propagation and coalescence.

ARMA-96-1603

2nd North American Rock Mechanics Symposium

ARMA-96-1691

2nd North American Rock Mechanics Symposium

Bazant, bulk strain, Continuum, damage, distribution, equation, formulation, fracture, hole boundary, hydraulic fracturing, management and information, material, mechanics, mesh, Modeling & Simulation, nonlocal, nonlocal damage model, nonlocal formulation, reservoir description and dynamics, strain, Upstream Oil & Gas, well completion

SPE Disciplines:

Technology:

3.1 Triaxial test data and local constitutive modelling

ARMA-96-1699

2nd North American Rock Mechanics Symposium

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.47)

Thank you!