VELOCITY SENSITIVE SAFETY VALVE

In accordance with an illustrative embodiment of the present invention, a downhole safety valve that closes automatically in response to excessive flow rate or velocity has an enlarged piston section on the upper end of the valve actuator to reduce the influence of seal friction and the like as an i...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	YOUNG D,US
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Beschreibung
Zusammenfassung:	In accordance with an illustrative embodiment of the present invention, a downhole safety valve that closes automatically in response to excessive flow rate or velocity has an enlarged piston section on the upper end of the valve actuator to reduce the influence of seal friction and the like as an impediment to repetitive closing movements of the valve, and oppositely extending sleeves providing for fluid communication to the low pressure side of the piston section in such a manner as to provide a protection against damage to seal elements and surfaces by abrasive particles in the production fluids.