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Magnetically coupled safety valve with satellite outer magnets

  • US 8,038,120 B2
  • Filed: 12/29/2006
  • Issued: 10/18/2011
  • Est. Priority Date: 12/29/2006
  • Status: Active Grant
First Claim
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1. A safety valve for use in a subterranean well, the safety valve comprising:

  • a housing surrounding a longitudinal flow passage;

    multiple longitudinal chambers positioned in a space between an outer perimeter of the flow passage and an exterior of the housing; and

    multiple first magnetic devices, each of the first magnetic devices being reciprocably disposed in a corresponding one of the chambers,wherein displacement of the first magnetic device in a first direction permits flow of fluid through the flow passage and displacement of the first magnetic device in a second direction opposite the first direction prevents flow of fluid through the flow passage.

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