Pressure compensated actuated check valve

Details Pressure compensated actuated check valve Pressure compensated actuated check valve

1997-12-22

1999-11-23

Dang, Hoang C.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166 861, 166 881, 166 884, 166 951, 166 971, 166368, E21B 33035

Patent

active

059882824

ABSTRACT:
A horizontal tree having a vertical bore and a horizontal production passage is landed in a wellhead housing. A tubing hanger lands in the bore and has a vertical passage and a horizontal passage that aligns with that of the tree. A retrievable first plug seals the vertical passage. A tree cap seals in the tree bore above the tubing hanger and has an axial passage. A retrievable second plug having a valve seals the tree cap passage. A vent port extends laterally through the tree cap between its axial passage and outer surface. A pair of seals on the second plug seal above and below the vent port. A tubing annulus passage communicates with the vent port and an annulus passage. The second plug serves as a second pressure barrier to the first plug and blocks the vent port when the valve is closed. The annulus passage is sealed from communication with a void between the plugs. The valve may be opened to release pressure in the void by applying pressure to an upper end of the check valve.

REFERENCES:
patent: 2830666 (1958-04-01), Rhodes
patent: 2939534 (1960-06-01), Allen
patent: 5372199 (1994-12-01), Cegielski et al.
patent: 5544707 (1996-08-01), Hopper et al.
patent: 5575336 (1996-11-01), Morgan
patent: 5868204 (1999-02-01), Pritchett
patent: 5884706 (1999-03-01), Edwards

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