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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
381

Numerical Calculation of Transport Properties of Rock with Geometry Obtained Using Synchrotron X-ray Computed Microtomography

2013 November 1900 (has links)
Macroscopic properties of rocks are functions of pore-scale geometry and can be determined from laboratory experiments using rock samples. Macroscopic properties can also be determined from computer simulations using 3D pore geometries derived from various imaging techniques. Using 3D imagery and computer simulations, we can calculate the porosity, permeability, formation resistivity factor and cementation exponent in reservoir drill cores. The objective of this thesis was to develop a workflow using Synchrotron X-ray Computed Microtomography (CMT) images and commercially available software in order to determine the macroscopic properties in reservoir drill cores for Midale Marly (M0) and Vuggy Shoal (V6) rocks. The workflow started by using CMT data that provided three-dimensional images of the reservoir rocks taken from drill cores in the Weyburn oil field. The resulting CMT grey scale images were used to isolate the pore space in the rock image. A three-dimensional mesh, representing the pore space, was then used to obtain the solution of the Navier-Stokes equations for an incompressible fluid and Laplace's equation for electrical current flow. Solutions of the Navier-Stokes equations were computed with different inlet pressures for the same pore geometry in order to confirm a direct proportionality between the mass fluid flux and pressure gradient as Darcy’s Law specifies. Previously measured laboratory transport properties were compared with my calculated transport properties on a smaller sub-volume of the same rock core imaged using 0.78 µm resolution CMT images. For the Midale Marly rock, the calculated permeability ranged from 0.01 to 3.53 mD. The formation resistivity factor ranged from 29.3 to 309.43 and the cementation exponent ranged from 1.99 to 2.10. The sample was verified to be nearly isotropic as the permeability was similar for three orthogonal fluid flow directions. Even though the sub-volume analyzed was smaller than a Representative Elementary Volume (REV), the results are within an order of magnitude of the previously calculated laboratory results as completed by Glemser (2007) and fall on the same power law trend. A Vuggy (V6) sample was investigated after the sample had been exposed to CO2, and dissolution within the rock matrix resulted in large visible pore spaces. Using 7.45 µm resolution CMT images, the permeability for a large isolated pore could not be calculated using the previous workflow due to computer memory limitations. Resampling enabled the data to fit into the available computer memory. The permeability values ranged from 2.66x10^5 to 8.59x10^5 mD for resampling the CMT images from 2x to 10x.
382

A Novel Approach For the Simulation of Multiple Flow Mechanisms and Porosities in Shale Gas Reservoirs

Yan, Bicheng 16 December 2013 (has links)
The state of the art of modeling fluid flow in shale gas reservoirs is dominated by dual porosity models that divide the reservoirs into matrix blocks that significantly contribute to fluid storage and fracture networks which principally control flow capacity. However, recent extensive microscopic studies reveal that there exist massive micro- and nano- pore systems in shale matrices. Because of this, the actual flow mechanisms in shale reservoirs are considerably more complex than can be simulated by the conventional dual porosity models and Darcy’s Law. Therefore, a model capturing multiple pore scales and flow can provide a better understanding of complex flow mechanisms occurring in these reservoirs. Through the use of a unique simulator, this research work establishes a micro-scale multiple-porosity model for fluid flow in shale reservoirs by capturing the dynamics occurring in three separate porosity systems: organic matter (mainly kerogen); inorganic matter; and natural fractures. Inorganic and organic portions of shale matrix are treated as sub-blocks with different attributes, such as wettability and pore structures. In the organic matter or kerogen, gas desorption and diffusion are the dominant physics. Since the flow regimes are sensitive to pore size, the effects of smaller pores (mainly nanopores and picopores) and larger pores (mainly micropores and nanopores) in kerogen are incorporated in the simulator. The separate inorganic sub-blocks mainly contribute to the ability to better model dynamic water behavior. The multiple porosity model is built upon a unique tool for simulating general multiple porosity systems in which several porosity systems may be tied to each other through arbitrary transfer functions and connectivities. This new model will allow us to better understand complex flow mechanisms and in turn to extend simulation to the reservoir scale including hydraulic fractures through upscaling techniques
383

PROTEIN KINASE A, EXCHANGE PROTEIN ACTIVATED BY cAMP 1, AND PHOSPHODIESTERASE 4D ALL ASSOCIATE WITH VE-CADHERIN TO REGULATE ENDOTHELIAL BARRIER FUNCTION

Ovens, Jeffrey David 17 September 2007 (has links)
Vascular endothelial cells (VECs) play an essential role in regulating the passage of macromolecules and cells between the blood stream and underlying tissues. The second messenger 3’, 5’ cyclic adenosine monophosphate (cAMP) regulates numerous events in VECs, including permeability. Since human VECs express several distinct cAMP-hydrolyzing phosphodiesterases (PDEs), and these are the only enzymes that catalyze the inactivation of cAMP, we investigated if selective pharmacological inhibition of PDEs could impact VEC permeability. Interestingly, we found that PDE4 inhibitors decreased human aortic VEC (HAEC) permeability and PDE4 and PDE3 inhibitors decreased human microvascular VEC (HMVEC) permeability. Consistent with a role for both protein kinase A (PKA) and exchange protein activated by cAMP (EPAC) in regulating VEC permeability, selective activators of these enzymes significantly decreased permeability. Since neither PDE4 nor PDE3 inhibitors significantly increased cAMP in these cells, our data are consistent with the idea that PDE inhibition causes small localized increases in “pools” of cAMP that regulate permeability. In order to test if PDE4 enzymes could act locally on pools of cAMP that regulated permeability, we selectively isolated the adherens junctional protein VE-cadherin from confluent monolayers of HAECs or HMVECs, and immunoblotted these isolates for cAMPeffectors and PDEs. Briefly, we found that each PKA-II, EPAC1, and a PDE4D variant, but not PDE3 enzymes, each could be isolated in VE-cadherin-based complexes from these cells. These novel findings identify PKA-II, EPAC1, and PDE4D as members of VE-cadherin-based signaling complexes in human VECs and are consistent with the idea that localized cAMP-signaling regulates permeability in these cells. / Thesis (Master, Pathology & Molecular Medicine) -- Queen's University, 2007-09-14 15:52:20.216
384

Coupling of Stress Dependent Relative Permeability and Reservoir Simulation

Ojagbohunmi, Samuel A. Unknown Date
No description available.
385

Permeability estimation of fracture networks

Jafari, Alireza Unknown Date
No description available.
386

The role of small intestinal permeability in the pathogenesis of colitis in the interleukin-10 gene deficient mouse

Arrieta Mendez, Marie Claire Unknown Date
No description available.
387

Influence of Geomechanical Processes on Relative Permeability

Hamoud, Mohamed Unknown Date
No description available.
388

Proton conducting polymer composite membrane development for Direct Methanol Fuel Cell applications.

Luo, Hongze. January 2008 (has links)
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</style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal" / mso-tstyle-rowband-size:0 / mso-tstyle-colband-size:0 / mso-style-noshow:yes / mso-style-priority:99 / mso-style-qformat:yes / mso-style-parent:"" / mso-padding-alt:0in 5.4pt 0in 5.4pt / mso-para-margin-top:0in / mso-para-margin-right:0in / mso-para-margin-bottom:10.0pt / mso-para-margin-left:0in / line-height:115% / mso-pagination:widow-orphan / font-size:11.0pt / font-family:"Calibri","sans-serif" / mso-ascii-font-family:Calibri / mso-ascii-theme-font:minor-latin / mso-fareast-font-family:"Times New Roman" / mso-fareast-theme-font:minor-fareast / mso-hansi-font-family:Calibri / mso-hansi-theme-font:minor-latin / mso-bidi-font-family:"Times New Roman" / mso-bidi-theme-font:minor-bidi / } </style> <![endif]--><span style="font-size: 12pt / font-family: &quot / Times New Roman&quot / ,&quot / serif&quot / ">The objective of this study was thus to prepare highly proton condictivity membranes that are cheap to manufacture and have low methanol permeability. &nbsp / &nbsp / </span></p>
389

Cross-linkable polyimide blends for stable membranes

Sorensen, E. Todd 12 1900 (has links)
No description available.
390

Ultrasound mediated permeabilization of cell membranes

Liu, Jin 12 1900 (has links)
No description available.

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