The effect of geometrical imperfections on the strength of OCTG

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dc.contributor.advisorStanciulescu, Ilinca
dc.contributor.committeeMemberBrake, Matthew
dc.creatorMutis Rueda, David
dc.date.accessioned2019-05-17T13:39:02Z
dc.date.available2019-05-17T13:39:02Z
dc.date.created2018-05
dc.date.issued2018-02-12
dc.date.submittedMay 2018
dc.date.updated2019-05-17T13:39:02Z
dc.description.abstractOil Country Tubular Goods (OCTG) is a term used to describe the family of steel pipes that are used in the oil and gas industry for construction of wells and hydrocarbon production. The American Petroleum Institute (API) specifies the technical delivery conditions and requirements for OCTG. These requirements include material properties, dimensions, tolerances and allowable defects among others. The tolerances for dimensions and allowable geometrical defects are referred here as geometrical imperfections. This thesis focuses on the impact that these geometrical imperfections have on the strength of OCTG, which is a concern for both casing and tubing designers and tubular manufacturers. Eccentricity between the pipe outside and inside diameter, ovality of the pipe cross-section and lack of longitudinal straightness are the common geometrical imperfections included in the analysis, in addition to a particular case with internal surface wear caused by tool joint friction. The evaluation using the Finite Element Method (FEM) of pipes with and without the geometrical imperfections reveals that the theoretical calculations for onset of yield fail to capture the effect of imperfections under certain loading conditions. The eccentricity and lack of straightness impact the tension and compression strength while the ovality and internal surface wear impact the internal and external pressure strength. A high dependence of the onset of yield on the pipe geometry is identified and characterized in the post-processing of results. Finally, strength reduction factors that take into account the imperfection type, its magnitude, the loading conditions and relevant pipe geometry variables are proposed.
dc.format.mimetypeapplication/pdf
dc.identifier.citationMutis Rueda, David. "The effect of geometrical imperfections on the strength of OCTG." (2018) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/105621">https://hdl.handle.net/1911/105621</a>.
dc.identifier.urihttps://hdl.handle.net/1911/105621
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectOCTG
dc.subjectimperfections
dc.subjecteccentricity
dc.subjectovality
dc.subjectstraightness
dc.subjectpipe
dc.subjecttubular
dc.subjectstrength
dc.titleThe effect of geometrical imperfections on the strength of OCTG
dc.typeThesis
dc.type.materialText
thesis.degree.departmentMechanical Engineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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