TWO STAGE CEMENTING COLLAR

A cementing collar having a valve sleeve therein releasably held in port closed pre-cementing position until actuated by a plug device to a port open position maintained by a latching structure until a second plug device actuating a port closing seat disengages the latching structure and moves the v...

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Bibliographische Detailangaben
Hauptverfasser:	TALIAFERRO W,US, HENLEY R,US
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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Beschreibung
Zusammenfassung:	A cementing collar having a valve sleeve therein releasably held in port closed pre-cementing position until actuated by a plug device to a port open position maintained by a latching structure until a second plug device actuating a port closing seat disengages the latching structure and moves the valve sleeve into a post-cementing port closed position.