A control system can be used with a single control line to a subsurface safety valve. The operating piston is exposed to the flow tube between two blocks with near identical seals to make the piston insensitive to tubing pressure. A control system seal is carried by the piston in the upper block and a passage between the control system seal and the tubing pressure seal in the upper block communicates to a compressible fluid reservoir in the lower block that is also isolated from tubing pressure by a tubing pressure seal. Movement of the piston compresses the fluid in the reservoir. The reservoir can also include a spring to return the piston and the flow tube to a position to close the valve. A redundant system can be actuated if the primary system fails.
申请公布号
EP2079899(A2)
申请公布日期
2009.07.22
申请号
EP20070863936
申请日期
2007.11.06
申请人
BAKER HUGHES INCORPORATED;BANE, DARREN E.;ANDERSON, DAVID Z.;JACKSON, AARON T.
发明人
BANE, DARREN E.;ANDERSON, DAVID Z.;JACKSON, AARON T.