Failsafe gas closed safety valve
Abstract
A subsurface well safety valve is described for controlling the fluid flow through a well conduit comprising: a housing having a bore; a valve closure member moving between open and closed positions for controlling the fluid flow through the bore; a flow tube telescopically moving in the housing for controlling the movement of the valve closure member; a piston and cylinder assembly positioned in the housing and one of the piston and cylinder engages the flow tube, a first side of the assembly adapted to be in communication with a fluid control passageway to the well surface; a gas chamber in the housing in communication with the second side of the assembly acting on the assembly in a direction to close the valve; spring means between the housing and the flow tube acting on the flow tube in a direction to close the valve; seal means between the piston and cylinder; and openable and closable equalizing means for equalizing fluid pressure on opposite sides of the piston and cylinder assembly in the event of a failure in the seal means thereby allowing the spring means to close the valve.
- Inventors:
- Publication Date:
- OSTI Identifier:
- 6776339
- Patent Number(s):
- US 4660646
- Assignee:
- Camco, Inc., Houston, TX
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: Filed date 27 Nov 1985
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 02 PETROLEUM; OIL WELLS; RELIEF VALVES; CLOSURES; CYLINDERS; FAILURES; FLUID FLOW; GASES; PISTONS; PNEUMATIC CONTROLLERS; SEALS; TUBES; CONTROL EQUIPMENT; EQUIPMENT; FLOW REGULATORS; FLUIDS; VALVES; WELLS; 020300* - Petroleum- Drilling & Production
Citation Formats
Blizzard, W A. Failsafe gas closed safety valve. United States: N. p., 1987.
Web.
Blizzard, W A. Failsafe gas closed safety valve. United States.
Blizzard, W A. 1987.
"Failsafe gas closed safety valve". United States.
@article{osti_6776339,
title = {Failsafe gas closed safety valve},
author = {Blizzard, W A},
abstractNote = {A subsurface well safety valve is described for controlling the fluid flow through a well conduit comprising: a housing having a bore; a valve closure member moving between open and closed positions for controlling the fluid flow through the bore; a flow tube telescopically moving in the housing for controlling the movement of the valve closure member; a piston and cylinder assembly positioned in the housing and one of the piston and cylinder engages the flow tube, a first side of the assembly adapted to be in communication with a fluid control passageway to the well surface; a gas chamber in the housing in communication with the second side of the assembly acting on the assembly in a direction to close the valve; spring means between the housing and the flow tube acting on the flow tube in a direction to close the valve; seal means between the piston and cylinder; and openable and closable equalizing means for equalizing fluid pressure on opposite sides of the piston and cylinder assembly in the event of a failure in the seal means thereby allowing the spring means to close the valve.},
doi = {},
url = {https://www.osti.gov/biblio/6776339},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 28 00:00:00 EDT 1987},
month = {Tue Apr 28 00:00:00 EDT 1987}
}