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Closure mechanism with integrated actuator for subsurface valves

  • US 6,957,703 B2
  • Filed: 11/19/2002
  • Issued: 10/25/2005
  • Est. Priority Date: 11/30/2001
  • Status: Active Grant
First Claim
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1. A downhole safety valve for a tubular string operated by at least one control line extending independently of the tubular string to the safety valve, comprising:

  • a housing having uphole and downhole ends and a bore extending therethrough and a connection for a control line;

    a closure element mounted to said housing in said bore;

    an actuator in fluid communication with said connection for a control line to move said closure element to an open position in response to pressure changes from the control line, said connection mounted substantially between said closure element and said downhole end of said housing; and

    the weight of said actuator provides at least part of the force to urge said closure element to said closed position.

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