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dc.contributor.advisorFranz Hover.en_US
dc.contributor.authorYu, Changkuan, S.M. Massachusetts Institute of Technologyen_US
dc.contributor.otherMassachusetts Institute of Technology. Department of Mechanical Engineering.en_US
dc.date.accessioned2013-10-24T17:47:02Z
dc.date.available2013-10-24T17:47:02Z
dc.date.copyright2013en_US
dc.date.issued2013en_US
dc.identifier.urihttp://hdl.handle.net/1721.1/81710
dc.descriptionThesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.en_US
dc.descriptionCataloged from PDF version of thesis.en_US
dc.description.abstractGas lift valves are widely used in oil production fields to pump recycled gas and nitrogen into the production tubing, to sustain production by aerating the oil and lifting it to the ground or sea surface. Today's industry standard, a pressure-actuated valve, is susceptible to various modes of failure, including corrosion and jamming. Safety mechanisms are needed to seal the valve in case of a backflow event, in which oil flows backward through the production tubing. Since human monitoring is difficult to implement at deep level underground, these safety mechanisms have to be highly sensitive and autonomous. This thesis documents the design of an electronically-actuated gas lift safety system that builds on a prior invention based on shape-memory alloy, but, among other features, can handle the slowly changing temperature conditions downhole. The newly-designed control circuit is integrated into the original shape memory alloy (SMA) scheme. The selection criteria and features of various sensors in this circuit are reviewed in relation to oil's physical and chemical characteristics. System functionality is proved through model-scale prototype testing within a controlled environment. At the same time, the system is modeled with heat transfer and structural analysis to predict its behavior in different environments with air or water, or their mixture with oil. Overall, our concept satisfies many of the key operational needs in artificial gas lift.en_US
dc.description.statementofresponsibilityby Changkuan Yu.en_US
dc.format.extent99 p.en_US
dc.language.isoengen_US
dc.publisherMassachusetts Institute of Technologyen_US
dc.rightsM.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.en_US
dc.rights.urihttp://dspace.mit.edu/handle/1721.1/7582en_US
dc.subjectMechanical Engineering.en_US
dc.titleDesign of an electronically-actuated gas lift safety valveen_US
dc.typeThesisen_US
dc.description.degreeS.M.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mechanical Engineering
dc.identifier.oclc860986215en_US


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