SHUTTING DOWN AN UNDERWATER FLUID PRODUCTION WELL

A production control system for an underwater well, comprises: first electrically operated means (16) for supplying first hydraulic fluid, for opening a first control valve (18) of the well; second electrically operated means (22), for supplying second hydraulic fluid at a higher pressure than said...

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Bibliographische Detailangaben
Hauptverfasser:	Davey, Peter John, Kent, Ian John
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS FUNCTIONAL ELEMENTS OF SUCH SYSTEMS MINING MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PHYSICS REGULATING
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Beschreibung
Zusammenfassung:	A production control system for an underwater well, comprises: first electrically operated means (16) for supplying first hydraulic fluid, for opening a first control valve (18) of the well; second electrically operated means (22), for supplying second hydraulic fluid at a higher pressure than said first fluid, for opening a further control valve (23) of the well; electronic circuitry (SEM1) for providing electrical power for operating said first and second means; and means for controlling the sequence of closing said control valves as a result of a loss of electrical power from said electronic circuitry. The controlling means comprises: electrical power storage means (4); detection means (9) responsive to said loss of power from said electronic circuitry; and means (7, 8) coupled with said detection means for using electrical power from said storage means to keep said further control valve open for a period after closure of said first control valve and close it after said period. (Fig. 1)