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" Fluids and Interfaces at Nano- and Ångstrom Scales: Confined Fluid Phase Behavior "
Barsotti, Elizabeth Jennie
Piri, Mohammad
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Latin Dissertation
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English
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| Record Number
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1053146
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TL52263
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| Main Entry
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Barsotti, Elizabeth Jennie
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| Title & Author
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Fluids and Interfaces at Nano- and Ångstrom Scales: Confined Fluid Phase Behavior\ Barsotti, Elizabeth JenniePiri, Mohammad
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| College
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University of Wyoming
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| Date
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2019
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| Degree
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Ph.D.
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2019
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| Note
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465 p.
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| Abstract
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Since their discovery, tight oil and gas reservoirs have been plagued by low ultimate production numbers that rarely surpass 10%. One of the major factors contributing to this is the incomprehension of fluid phase behavior in these reservoirs. Indeed, operators only account for free gas and adsorbed phases in their reservoir evaluations and do not consider other types of nanoconfinement-induced phase behavior, such as capillary condensation and continuous pore filling. This is further compounded by a lack of experimental proof regarding these phenomena and their occurrence in petroleum reservoirs. To provide this proof, two types of measurements were undertaken. First, a novel gravimetric apparatus was developed to measure fluid phase behavior in shale cores at reservoir conditions. Using this apparatus, the first capillary condensation isotherms for fluids with more than two components were measured, a new phenomenon called supercritical hysteresis was discovered, irreversible kerogen swelling was observed, and adsorption-induced fractures were propagated. Second, a novel fluid injection system was developed for environmental transmission electron microscopy experiments. This allowed for direct visual observations of adsorption, capillary condensation, and adsorption-induced strain at the Ångstrom scale. Altogether, this work proves that capillary condensation can occur in petroleum reservoirs and that accounting for it in reserves estimates, reservoir modeling, and core analysis could significantly improve ultimate recovery from shale and tight formations.
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Nanoscience
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Petroleum engineering
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Thermodynamics
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Piri, Mohammad
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University of Wyoming
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