PRESSURE CONTROLLED WELL CONDUIT CIRCULATION SYSTEM

A pressure controlled well conduit circulation system between two well conduits for controlling circulation between the two conduits. A valve positioned in the passageway between two well conduits, such as in a well pocket, which is pressured loaded to remain closed until pressure in one of the cond...

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Bibliographische Detailangaben
Hauptverfasser:	TAUSCH G,US, WATKINS F,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 pressure controlled well conduit circulation system between two well conduits for controlling circulation between the two conduits. A valve positioned in the passageway between two well conduits, such as in a well pocket, which is pressured loaded to remain closed until pressure in one of the conduits forces the valve open and into a latched open position to allow free circulation between the two conduits. The valve including releasing means actuated on a predetermined pressure in the conduit to release the latching means and allow the valve to close as the conduit pressure decreases. The valve element having two sections telescopically connected together with a shear pin in an extended relationship so that the valve may be opened by shearing the pin in the event of valve failure.