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dc.contributor.advisorWu, Yu-Shu
dc.contributor.authorZhang, Chi
dc.contributor.committeememberWinterfeld, Philip H.
dc.contributor.committeememberZerpa, Luis E.
dc.contributor.committeememberTutuncu, Azra
dc.date.accessioned2020-02-03T11:29:00Z
dc.date.available2020-02-03T11:29:00Z
dc.date.submitted2019
dc.descriptionIncludes bibliographical references.
dc.description2019 Fall
dc.description.abstractData from a pilot test imply substantial water production after gas injection, which may impede oil production, but the underlying mechanisms are poorly understood. A compositional model is developed to study possible mechanisms for high water-cut pilot results. First, eight pseudo-components were used to match the PVT lab results of a typical oil sample from the Wolfcamp shale. A lab-scale model was then established in our simulation study to match the results of gas huff-n-puff experiments in cores, in which key parameters were identified and tuned. A half-stage field model consisting of five fractures was built, where stress-dependent permeability was represented by compaction tables. In addition, a sensitivity analysis was conducted to examine the roles of different mechanisms behind the abnormal high water-cut phenomenon. Our simulation results have shown that initial water saturation, IFT-dependent relative permeability, reactivation of water-bearing layers, and re-opening of unpropped hydraulic fractures may affect the water-cut after gas injection. Among them, re-opening of unpropped hydraulic fractures was the most critical factor. This study also optimized the period of injection and soaking phases and well bottom-hole pressure to improve the economic benefits of production operations.
dc.identifierZhang_mines_0052N_11893.pdf
dc.identifierT 8877
dc.identifier.urihttps://hdl.handle.net/11124/174015
dc.languageEnglish
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.rightsCopyright of the original work is retained by the author.
dc.titleSimulation of high water-cut in tight oil reservoirs during cyclic gas injection
dc.typeThesis
thesis.degree.disciplinePetroleum Engineering
thesis.degree.grantorColorado School of Mines
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)


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