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Showing 1 to 20 of 39 for “"Injectivity"”.
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Some generalizations of injectivity
… follows. In particular, general properties of injectivity and some of its well-known generalizations are stated. Chapter 2 is concerned with two generalizations of injectivity, namely near and essential injectivity. These concepts, together with the notion of the exchange property, prove to be …
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Hall plot analysis for horizontal well injectivity
… the 1960s, is a widely-used tool for analyzing injectivity. Over the past decades, industry has been modifying the Hall plot method for applications in various scenarios such as formation damage and/or stimulation diagnosis, polymer injection, and gas injection. It has proved to be a simple, …
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Effect of halite (NaCl) on sandstone permeability and well injectivity during CO2 storage in saline aquifers
… l/min. The flow rate increase indicates that the injectivity will increase. In part (ii), Helium Gas Porosimeter was used to calculate the porosity of each core sample and the results showed for Bentheimer, Castlegate and Idaho Gray 20.8 %, 25.6 % and 23.4 % respectively. Liquid saturating method …
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A Systematic Study of Injective Envelopes
… under these functors, in particular regarding injectivity and injective envelopes. We also compare the purely categorical definition of injectivity with the `standard' operator theoretical definition.
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Injection Impairment by Suspended Solids: Well Models, Filtration Parameters, and Models’ Validation with 3-D Injection Experiments
… resulting in reduced permeability and loss of injectivity. Water injection, without solids suspension, at high velocity generates a loss of injectivity as a non-Darcy flow effect. The compounding impacts of high injection fluid velocity with suspended solids are expected to produce more severe …
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Applications of microlocal analysis to some hyperbolic inverse problems
… in synthetic aperture radar, and the injectivity and stability of some generalized Radon transforms. Each problem is approached using microlocal methods. In the context of thermoacoustic tomography under the damped wave equation, I show uniqueness and stability of the problem with …
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Método de decomposição de domínios de múltiplos passos de tempo de Dirichlet-Neumann aplicado à injeção de polímeros em meios porosos
… the flow at the boundaries and quantify the injectivity ratio. We then validate the accuracy of the proposed method by comparing the discrete solutions with analytical and high-fidelity solutions. We also discuss the loss of injectivity due to non-Newtonian behavior, mechanical retention, and …
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The Baer Criterion For Injective Modules Over Noetherian Rings
… can refine our criteria for testing modules for injectivity.
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Modelling of fines migration mechanisms in high permeability sands: impact on reservoir performance.
… resulting in oil and gas inflow reductions or injectivity resistance. The problem is further enhanced in mature reservoirs where increased water ingress and multiphase production aggravate the fines mobilisation. Proper fines management can optimise productivity, injectivity, safeguard …
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Taming unstable inverse problems: Mathematical routes toward high-resolution medical imaging modalities
… fluxes of solutions), and recalling its lack of injectivity and severe instability, we show how going from Dirichlet-to-Neumann data to considering the power density operator leads to reconstruction of the full conductivity tensor via explicit inversion formulas. Moreover, such reconstruction …
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Investigating the use of different types of sealant materials for cement remedial applications
… viscosity, high bond strength to casing, high injectivity, low permeability, high ductility and high compressive and tensile strength. Secondly, to evaluate the effectiveness of these materials to repair cement's flaws, in the lab, by using cement cores flooding experiments. Two approaches will …
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Operator-valued Kirchberg Theory and its connection to tensor norms and correspondences
… the relations between relatively weak injectivity and relative amenablity. Finally we will apply our discoveries to recent results on C∗ -norms, and generically find a mechanism to construct a continuum number of C∗ -norms on some tensor products which admit infinitely many copies.
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The Behavior on the Restriction of Divisor Classes to Sequences of Hypersurfaces
… the integral closure, and investigate the injectivity of jn*. The first result shows that no nontrivial divisor class can lie in every kernel. Secondly, when A is an isolated singularity containing a field of characteristic zero, dim A ≥ 4, and A has a small Cohen-Macaulay module, then …
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Zero Divisors, Group Von Neumann Algebras and Injective Modules
… Finally, we prove some theorems about the injectivity of some spaces as ℂ𝐺 modules for some groups 𝐺.
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First Cohomology of Some Infinitely Generated Groups
… before looking at several results regarding the injectivity of induced maps from embeddings of G-modules. We present several new results for countable groups, and discuss which results fail to hold in the general uncountable case. Lastly, we present results regarding reduced cohomology, including …
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Volumetric mesh parameterization to a canonical template
… control distortion throughout the volume. Local injectivity is enforced via constrained line search during gradient descent. We evaluate the proposed method in the context of a twin pregnancy study that includes MRI scans of seven women. We achieve sub-voxel accuracy in mapping the boundary of …
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Relative Permeability Experiments of Carbon Dioxide Displacing Brine and Their Implications for Carbon Sequestration
… wetting flow. Based on these results, CO 2 injectivity will be reduced, pressure-limited reservoirs will have reduced capacity, and inclined area-limited reservoirs will have increased capacity. Future reservoir-scale modeling efforts should incorporate sensitivity to relative permeability. …
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Particle Detachment in Single-Phase and Two-Phase Flows in Porous Media
… for reliable laboratory-based prediction of well injectivity decline. The results show that fines migration during low-salinity water injection results in significant well injectivity impairment. The thesis also investigates low-salinity water slug injection followed by a high-salinity chase drive …
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Enhanced oil recovery simulation study for Citronelle field, Alabama
… as non-workability of WAG scheme due to loss of injectivity after converting back to water injection, presence of natural and induced fractures that affects flood performance, as well as operational issues - down-hole pumps, well integrity, and difficulties with data collection due to the mixing …
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Integrative Geophysical and Environmental Monitoring of a CO2 Sequestration and Enhanced Coalbed Methane Recovery Test in Central Appalachia
… variation with depth, and dynamic reservoir injectivity. Results have also led to the development of recommended injection strategy for CO2-ECBM operations. The work presented here describes the development of the monitoring program, including design considerations and rationales for selected …
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