Cyclic check valve for coiled tubing

A cyclic check valve SV is provided for a coiled tubing string which enables reverse circulating for a specific period when a specific combination of pumping condition and oil conditions are favorable. The check valve may be activated to prevent reverse flow up through the valve and into the coiled...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	JOHN GORDON MISSELBROOK, LUBOS VACIK, JOHN RAVENSBERGEN
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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