Resisting leakage from a downhole tool string

There is provided a downhole tool string 100 comprising a plurality of generally tubular bodies 102, 104, 106 formed of metal and connection means operable to connect said bodies one to another in an axially extending line; wherein at least one said body contains a flapper check valve assembly 114 w...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	Robert Crawford, Brent Neal Marsh
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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