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Pedro M. Reis. Mulcahy, Connor Gordon Massachusetts Institute of Technology. Department of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2016-07-01T18:42:16Z 2016-07-01T18:42:16Z 2016 2016 http://hdl.handle.net/1721.1/103460 952183654 Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016. Cataloged from PDF version of thesis. Includes bibliographical references (pages 59-61). We investigate the buckling of a slender elastic rod injected into a cylindrical constraint while undergoing axial rotation. Particular focus is given to extension of the helical buckling length. This problem is of particular application to coiled tubing operations in the oil and gas industry where helical buckling and eventual lockup occur, thereby preventing complete access to horizontal oil wells. Our approach focuses on using desktop experiments to perform a precise exploration of the parameters affecting buckling. We examine two separate modes of axial rotation: continuous rotation and oscillatory rotation. In each case, we demonstrate potential for significant increases in helical buckling length by a factor of as much as 5 within the parameter space studied and develop an understanding of the underlying mechanisms at play. In the case of continuous rotation, we compare our experimental results to theoretical predictions motivated by this work. The extensions in helical buckling length observed here suggest significant application to the problem of helical buckling in coiled tubing operations. by Connor Gordon Mulcahy. S.M. 61 pages eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. Rotation of a slender rod injected into a cylindrical constraint Thesis application/pdf Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="5959236f-415e-4f3f-816c-e3b7a1e9ff02"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Rotation of a slender rod injected into a cylindrical constraint</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2016</PublicationDate> <Authors> <Author> <DisplayName>Mulcahy, Connor Gordon</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <Abstract>We investigate the buckling of a slender elastic rod injected into a cylindrical constraint while undergoing axial rotation. Particular focus is given to extension of the helical buckling length. This problem is of particular application to coiled tubing operations in the oil and gas industry where helical buckling and eventual lockup occur, thereby preventing complete access to horizontal oil wells. Our approach focuses on using desktop experiments to perform a precise exploration of the parameters affecting buckling. We examine two separate modes of axial rotation: continuous rotation and oscillatory rotation. In each case, we demonstrate potential for significant increases in helical buckling length by a factor of as much as 5 within the parameter space studied and develop an understanding of the underlying mechanisms at play. In the case of continuous rotation, we compare our experimental results to theoretical predictions motivated by this work. The extensions in helical buckling length observed here suggest significant application to the problem of helical buckling in coiled tubing operations.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>