Graduate Thesis Or Dissertation
 

Linking Pore-scale Fluid-Fluid Interfacial Curvature in Porous Media to Capillary Pressure and Local Morphology with A Novel Method for Curvature Measurement

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/n296x212d

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  • Systems that contain multi-phase flow in porous media are of interest in diverse fields including environmental engineering, hydrogeology, and petroleum engineering etc. One of the main descriptors of multi-phase flow in porous media is the relationship between capillary pressure and fluid saturation. Capillary pressure is inherently a pore-scale variable and is generally measured externally by a pressure transducer. As an alternative, it has recently become possible to estimate capillary pressure from images by using curvature values using the Young-Laplace equation. X-ray microtomography is the general platform to perform three dimensional imaging, and for producing measurements such as interfacial curvatures. To improve such curvature measurement, different image processing scenarios were tested and a novel curvature estimation method was developed. Results revealed that errors on the curvature estimates have been significantly reduced for both synthetic data and real data sets. Because curvature-based capillary pressure for disconnected non-wetting blobs differs from transducer-based capillary pressure due to residual oil blobs experience less hysteresis as well as the influence of local pore morphology, connected fluid and disconnected fluid were considered separately.
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