A Thermally Actuated Gas-Lift Safety Valve
- Eric Gilbertson (Massachusetts Institute of Technology) | Franz Hover (Massachusetts Institute of Technology) | Bryan Freeman (Chevron ETC)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- January 2013
- Document Type
- Journal Paper
- 77 - 84
- 2013. Society of Petroleum Engineers
- 3.1.6 Gas Lift, 5.1.5 Geologic Modeling, 4.3.4 Scale, 3.1 Artificial Lift Systems
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- 729 since 2007
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Most offshore oil wells use flow-control safety valves that are either actively controlled from the surface or passively actuated by pressure changes. In this paper, we propose a passive, thermally actuated safety valve that adds redundancy to well systems and significantly increases well safety. We use quasistatic thermal modeling, validated with experimental downhole data, to identify and characterize a suitable temperature regime for shape memory alloy actuation. We develop a complete loading and shut-in procedure with the new valve that is consistent with current practice in artificial lift. Finally, through a true-scale stainless-steel prototype, we demonstrate essential manufacturability and successful valve closure in accordance with predictions.
|File Size||868 KB||Number of Pages||8|
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