Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Fracture growth"”.
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Fracture Growth Kinematics in Tight Sandstone Reservoirs
Opening-mode fractures—joints and veins—are widespread structures in sedimentary rocks even in slightly deformed and flat-lying sequences. Understanding the growth and connectivity of fractures in low permeability sandstone reservoirs is essential for optimal hydrocarbon exploitation. In a linear …
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Geomechanical aspects of fracture growth in a poroelastic, chemically reactive environment
Natural hydraulic fractures (NHFs) are fractures whose growths are driven by fluid loading. The fluid flow properties of the host rock have a primary, but hitherto little appreciated control on the NHF propagation rates. This study focuses on investigating the impacts of host rock fluid flow on the …
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Shear Fracture Growth in Granular Rocks and Porosity-Permeability Relationships in Mudstones
… of 0–50 MPa, leading to the development of shear fractures through interaction of emergent microcracks occurring in shear and tensile modes. I document the mode and energy associated with microcracks to analyze fracture growth patterns and quantify energy release. Shear fracture growth in my …
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Modelling of flow during fracture growth driven by multiple fluid stages using high-performance parallel computing algorithms
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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The growth of fractures in the Earth
Fracture growth under compressive loading is studied using the maximum strain energy release rate criterion by means of both the finite element and the boundary element methods. Although this approach is computationally intensive, it is indispensable for this type of problem because other criteria …
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Mechanisms of fracture complexity and topology of fracture systems induced by hydraulic fracturing
… general, SRV describes the topology of induced fractures by hydraulic fracturing. Natural fractures (NFs), such as joints and faults, are ubiquitous in oil and gas reservoirs, where their tectonics, diagenesis, and hydrocarbon-generation history make the rock prone to fracturing. Being a …
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Potential for electrical power generation from dry geothermal sources
… fracturing of a well in which no subsequent fracture growth occurs. The initial model was later refined using a finite disk to model the fracture geometry. A finite thickness slab, infinite in extent, was used to approximate the fissure geometry created by thermal stress cracking in a …
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Acoustic monitoring of hydraulic stimulation in granites
… levels of heat and recoverable energy. Hydraulic fracture stimulation of low permeability EGS reservoir rock is widely employed to develop this resource and is generally required to make unconventional resources an economically viable resource. Significant challenges for EGS technology include …
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Fracture toughness determination and micromechanics of rock under Mode I and Mode II loading
… method for the determination of Mode II (shear) fracture toughness, KIIC of rock and compares the outcome to results from Mode I (tensile) fracture toughness, KIC, testing using the International Society of Rock Mechanics Chevron-Bend method.Critical Mode I fracture growth at ambient conditions …
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Comparison Study of Liquid CO2 and Water as a Fracturing Fluid for Improved Gas Production in Tight Reservoirs
… however it is crucial to understand how fracture growth and production comparison when different fluid systems like water and CO2 based systems are being used. In this thesis, based on tight reservoir model in WCSB, firstly we have reviewed how conventional water based hydraulic …
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A study into the mapping of an induced fracture in a fine grained sediment in biaxial and triaxial stress formations
… to extract hydrocarbons the shale has to be fractured to release the trapped fluid. The ability to predict when a fracture will occur and what the resulting shape of that fracture will be has recently become increasingly important in engineering, and, in particular the petroleum industry. …
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A generalized finite element method for the simulation of non-planar three-dimensional hydraulic fracture propagation
Hydraulic fractures are a class of tensile fractures that occur in brittle and quasi-brittle materials due to the injection of a viscous fluid. Hydraulic fractures occur both naturally and created deliberately for engineering applications. In the oil and gas industry, it is a preferred method to …
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Effect of Physical Activity on Bone, Muscle and Fracture Risk during Growth
Osteoporosis and related fractures are a global health problem. Physical activity, especially during growth, has been suggested as a strategy to improve musculoskeletal health in the population. Previous prospective pediatric exercise intervention studies, however, are short-term, mostly covering …