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  • Nathan Deisman
Nathan Deisman

Nathan Deisman
University of Alberta | UAlberta · Department of Civil and Environmental Engineering and the School of Mining and Petroleum Engineering

Doctor of Engineering

About

26
Publications
4,867
Reads
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432
Citations
Citations since 2017
10 Research Items
203 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050

Publications

Publications (26)
Article
Full-text available
Opalinus Clay is the designated host rock for a deep geological repository of radioactive waste in Switzerland. The determination of its geo-mechanical properties relies heavily on laboratory tests on small specimens. To assess the in-situ elastic stiffness at a larger scale, pressuremeter tests were performed in Opalinus Clay at the Mont Terri Roc...
Article
Coals are heterogeneous and the zones of interest for gas production (high fracture density) are often friable. 3D printed (3DP) rocks can create a repeatable analogue by minimizing specimen variability. This study investigates a series of 3DP coal seam gas packages under various flow conditions to determine the impact of fracture network and inter...
Conference Paper
Understanding the elastic stiffness evolution of the host rock under stress is important in the prediction of ground deformation during the construction and operation of a radioactive waste repository. The relationship established between dynamic elastic properties and stress also allows for an accurate interpretation of seismic survey and borehole...
Conference Paper
Hydrocarbon production induces reservoir depletion changes the in-situ stress state. This process alters the effective stress and deforms the reservoir rock, changing the multiphase flow properties. An integrated laboratory testing facility was developed to investigate the effects of triaxial stress on the governing mechanisms of multiphase fluid f...
Article
Full-text available
Understanding the elastic stiffness evolution of Opalinus Clay is necessary for predicting ground deformation during the construction and operation of radioactive waste repositories. The elastic stiffness is stress dependent, and it degrades when a deviatoric stress/strain threshold is exceeded. A series of multi-staged triaxial tests is used to ex...
Conference Paper
Full-text available
Pre-bored pressuremeter tests were conducted in the Opalinus Clay at Mont Terri Rock Laboratory. The objective of the tests was to quantify the in-situ rock stiffness at multiple pressure levels. Tests in two boreholes by different types of pressuremeter probes both demonstrate high quality of field measurement. Both stress and strain dependencies...
Article
This paper presents the result of five pressuremeter tests conducted in deep three clay shale formations at a thermal operation site. Pressuremeter loading was imposed parallel to the bedding plane under an approximately undrained condition and test data were analyzed using the axisymmetric cavity expansion theory. In parallel with triaxial test re...
Conference Paper
In this study, a novel experimental system has been developed for static and dynamic elastic properties measurements at seismic frequencies under anisotropic stress and shear deformation conditions. This system focuses on static and seismic range frequencies dynamic (0.1 Hz to 20 Hz) elastic deformation properties of poorly consolidated oil sands a...
Article
An efficient, numerical local upscaling technique for estimating elastic geomechanical properties in heterogeneous continua is proposed. The upscaled anisotropic elastic properties are solved locally with various boundary conditions and reproduce the anisotropic geomechanical response of fine-scale simulations of sand–shale sequence models with hor...
Conference Paper
A hydro-geomechanical coalbed methane reservoir characterization workflow is reviewed and applied to three field cases from the same coalseam formation. The workflow begins from core sample characterization and ends at reservoir performance. A core sample and geophysical logging rock mass characterization approach using the newly adopted Geological...
Article
The use of geostatistics has become an important concept to characterize uncertainty in reservoir simulations. Only recently has the concept been applied to geomechanics and coupled reservoir geomechanical simulations. The work presented here describes how the Geological Strength Index (GSI) is used to represent the fractured reservoir properties o...
Article
Collecting data that help to quantify potential CO2 leakage rates along abandoned wellbores is important for feasibility assessment of long-term storage of CO2 in geological formations. A field testing program was developed to investigate wellbore integrity as a component of the International Energy Agency Green House Gas Weyburn–Midale CO2 Monitor...
Article
The prediction of geomechanical properties for carbonate rocks has become a topic of increasing interest due to existing unconventional hydrocarbon resources in carbonate reservoirs. However the heterogeneity of carbonates presents a challenge in providing accurate estimates applicable to the wide variety of textures and porosities. An example of s...
Conference Paper
The U of A recent work has been aimed at key components and uncertainties around the safe design of Steam Assisted Gravity Drainage for shallow heavy oil production. It has been demonstrated that during SAGD process, geomechanical behaviours heavily influence both the production of oil, and the integrity of the reservoir system. This work highlight...
Article
Caprock integrity evaluation is critical to successful thermal recovery processes in oil sands. It is noted that continuous high pressure steam injection triggers drastic drop of effective stress of formations. Coupled reservoir- geomechanical simulations have become a key part for caprock integrity assessments. This study demonstrates the use of t...
Article
Coal and coal seam reservoirs have unique properties and therefore pose unique reservoir engineering challenges. Coal reservoir permeability is due primarily to fracturing where gas is stored primarily through sorption in the intact matrix. Coal permeability is stress dependent and changes in gas contents and composition induce volumetric strain. C...
Article
The effects of fractures or joints on geomechanical properties of coal when transitioning from small samples to larger field scales have long been recognized. Two geomechanical characterization methodologies for of a coal seam for reservoir engineering are presented which attempt to account for these scale effect. The first is a well established em...
Article
The objective of this study was to evaluate a series of mud systems and additives typically used in coalbed methane drilling in terms of formation of an instantaneous filter cake, ability of the coal reservoir to rid itself of the filter cake during production, and overall impact on coal permeability. To achieve this, a series of laboratory tests w...
Article
A methodology is proposed to quickly assess the stability risk for horizontal wells drilled in coal seams. The first task involves the estimation of strength and deformation parameters of the coal by indirect methods, such as the use of core description to assign a Geological Strength Index (GSI). The second task involves the use of a finite elemen...
Article
Geomechanical effects during several stages of the reservoir life cycle are becoming more important in understanding the overall behaviour of the reservoir. Fractured reservoirs are generally recognized to be sensitive to changes in effective stress caused by production activities including production and injection processes. Using a reservoir simu...
Conference Paper
Full-text available
The Synthetic Rock Mass (SRM) approach to jointed rock mass geomechanical characterization is demonstrated to help understand changes in coal seam behaviour due to scale and effective stress. The SRM approach is a numerical modeling technique which uses the Bonded Particle Model for rock and a Discrete Fracture Network simulation. This allows for l...
Article
One unconfined compressive strength (UCS) test and four high-pressure triaxial stress tests were conducted on coal cores in order to best emulate the key issues regarding horizontal wellbore stability, coal strength, permeability change, and coal fines generation during the life cycle of a coalbed methane reservoir. The four non-trivial stress path...
Conference Paper
Full-text available
The Synthetic Rock Mass (SRM) approach combines the Bonded Particle Model for rock with a Discrete Fracture Network and a Smooth Joint model to numerically examine the behaviour of rock masses. The SRM has been shown to predict the behaviour of a rock mass, however the Smooth Joint model has not been rigorously tested against simple laboratory obse...
Conference Paper
Full-text available
The Synthetic Rock Mass approach to jointed rock mass characterization (Pierce et al. 2007) is reviewed relative to existing empirical approaches and current understanding of jointed rock mass behaviour. The review illustrates how the key factors affecting the mechanical behaviour of jointed rock masses may be considered and demonstrates that the S...
Article
Static and dynamic geomechanical properties and hydraulic permeability were determined for six large blocks of bituminous coal sampled from active mines in the Foothills and Mountain regions of western Canada. Testing showed a nonlinear shear strength envelope and brittle failure during triaxial loading. The dominant failure mode was along distinct...

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