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Apparatus for surface control of a sub-surface safety valve

  • US 20030230190A1
  • Filed: 06/10/2003
  • Published: 12/18/2003
  • Est. Priority Date: 06/14/2002
  • Status: Abandoned Application
First Claim
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1. Apparatus for surface control of a sub-surface safety valve set within the production tubing of a drilled well, the apparatus comprising a hydraulic actuator for opening the sub-surface safety valve, a control line for supplying hydraulic control fluid to the actuator, control valve means for controlling the supply of hydraulic fluid to the control line, a non-return valve in the control line path, between the actuator and the control valve means, for preventing any contaminants entering the hydraulic fluid at the actuator from reaching the control valve means by migration up the control line, and an hydraulic fluid exhaust means connected to the actuator and control line for enabling flushing of fluid from the control line.

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