This paper reviews the project to develop a wireline retrievable, surface controlled, subsurface safety valve system capable of being set at great depth. Following alternative system reviews, four valves were selected for further evaluation and possible development. Only one of them, the electric solenoid safety valve system, has been fully developed and field proven. In addition to the development of the electric solenoid safety valve and its respective nipple, the special cable that was developed for the system, the high pressure wellhead pack-off arrangement for cable passage through the wellhead and the electric safety valve control system are discussed. The field experience with this safety valve, in two gas well completions, the wider application in Shell's operations and possible future developments are described.

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