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Magnetically coupled safety valve with satellite inner magnets

  • US 8,919,730 B2
  • Filed: 09/13/2011
  • Issued: 12/30/2014
  • 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:

  • multiple first magnetic devices which reciprocate within respective longitudinally extending chambers;

    a second magnetic device magnetically coupled to the first magnetic devices; and

    wherein the first magnetic devices are circumferentially spaced apart and are encircled by the second magnetic device.

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