Risk analysis of steel production risers for deepwater offshore facilities

dc.contributor.advisorGilbert, Robert B. (Robert Bruce), 1965-
dc.contributor.advisorPopova, Elmira
dc.creatorJain, Anubhav
dc.description.abstractA probabilistic methodology is developed to quantify the risks associated with structural failure of a steel production riser and in deepwater oil and gas production. First, background on the steel production riser is presented, detailing its functions, main components, operational phases and design considerations. Next, the study riser, developed by Stress Engineering, is described and its design basis is presented. A fault tree of failure scenarios is then developed and analyzed. Fatigue is identified as the primary failure mechanism affecting the risk for a production riser between its base at the mud-line and its top at the sea level. Bursting, collapsing and yielding are not likely for the riser. Probabilistic fatigue analysis is carried out to better understand and quantify the probability of a fatigue failure. This analysis includes development of probabilistic model and quantifying the uncertainties in the input to the model. It was concluded that the probability of fatigue failure in a 20 yr design life is on the order of 1 in 1000 or smaller. This probability is consistent with the levels that are accepted in the offshore industry. The risk is very sensitive to the parameters of the weld, including the size and frequency of cracks in the weld and the properties of the intact weld material. The size and frequency of the crack in the weld depend on the quality of initial weld and the level of quality control in inspecting the weld for defects to the repaired. The critical location in the production riser with respect to the fatigue is at its base.en_US
dc.description.departmentOperations Research and Industrial Engineeringen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.subjectFatigue failureen_US
dc.subjectDeepwater facilitiesen_US
dc.subjectSteel production risersen_US
dc.titleRisk analysis of steel production risers for deepwater offshore facilitiesen_US
thesis.degree.departmentOperations Research and Industrial Engineeringen_US
thesis.degree.disciplineOperations Research and Industrial Engineeringen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.nameMaster of Science in Engineering.en_US

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