BACK PRESSURE CONTROL SYSTEM

A closure system to maintain a fluid in a borehole annular space, the closure system having a port connected to a main line, whereby a controlled flow of fluid from the annular space is permitted; the main line including a back pressure control system that can include a valve positioned in series wi...

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Bibliographische Detailangaben
Hauptverfasser:	NOTT, DARCY, BUTLER, STUART, RAMBO, DEAN
Format:	Patent
Sprache:	eng ; fre
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 closure system to maintain a fluid in a borehole annular space, the closure system having a port connected to a main line, whereby a controlled flow of fluid from the annular space is permitted; the main line including a back pressure control system that can include a valve positioned in series with the main line, the valve configured to provide unimpeded flow of fluid through the main line and the valve to the fluid return assembly when the valve is open; and an adjustable flow control apparatus (AFCA) with a choke positioned on a secondary line in parallel with the main line, where the AFCA defines an asymmetrical opening having a vertical profile with a first vertical end and a second vertical end, and where the first vertical end is configured to be exposed before the second vertical end when moving the choke to an open position. L'invention concerne un système de commande de contre-pression conçu pour être au moins partiellement intégré dans une installation de forage.