Downhole safety valve

Details Downhole safety valve Downhole safety valve

2006-03-20

2010-02-02

Gay, Jennifer H (Department: 3672)

Wells

Processes

Placing or shifting well part

C166S332800, C166S373000

Reexamination Certificate

active

07654333

ABSTRACT:
The present invention generally provides a method and apparatus for selectively sealing a bore. The tubular valve generally includes a closing member for seating in and closing the bore, and a pressure-actuated, retention member having first and second opposed piston surfaces opening and closing the valve. The tubular valve prevents sudden loss of pressure in the tubular and is controllable from the surface.

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GB Search Report, Application No. 0605750.9, Dated Jul. 21, 2006.
Great Britain Examination Report, Application No. GB0605750.9, dated Jun. 25, 2009.

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