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Title: 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}
}