Sand control seal for subsurface safety valve

A seal is provided to prevent contamination by sand or grit in the clearance between a flow tube and the inner housing wall in a safety valve. An enlarged space is provided adjacent the seal to allow accumulation of sand or grit in the annular clearance space without causing seizure of the flow tube...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	GRANT R. THOMPSON
Format:	Patent
Sprache:	eng
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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