Gravel pack

Flapper means in the form of a one piece frangible, ceramic flapper member (410) is used with an extrusion resistant resiliently faced valve seat. Said flapper member is biased to the closed position and rotatable within a flapper member chamber from an open position during run in to a closed positi...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	RALPH H ECHOLS, JOSEPH L. PEARCE, DANIEL L PATTERSON
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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