SURFACE CONTROLLED SUBSURFACE SAFETY VALVE

SURFACE CONTROLLED SUBSURFACE SAFETY VALVE A surface controlled subsurface safety valve for use in a well tubing string including a valve closure member, an operator tube for opening the valve closure member, a small diameter offset piston to move the operator tube in response to control fluid press...

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Bibliographische Detailangaben
Hauptverfasser:	DICKSON, RENNIE L, SMITH, RODDIE R
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:	SURFACE CONTROLLED SUBSURFACE SAFETY VALVE A surface controlled subsurface safety valve for use in a well tubing string including a valve closure member, an operator tube for opening the valve closure member, a small diameter offset piston to move the operator tube in response to control fluid pressure conducted from the well surface, and a spring biasing the operator tube to a position closing the valve. A bearing assembly mounted on the operator tube minimizes eccentric and torsional loading of the operator tube by the piston means and spring. The operator tube also has multiple flow paths and barriers to prevent accumulation of debris from well fluids within the safety valve. The safety valve has metal-to-metal sealing systems to improve valve life under harsh downhole well environments.