ASSEMBLY FOR PRESSURE CONTROL WHEN DRILLING AND METHOD TO CONTROL PRESSURE WHEN DRILLING IN A FORMATION WITH UNPREDICTABLE HIGH FORMATION PRESSURE - Patent 2087197

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EP 2 087 197 A1

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(43)	Date of publication:
	12.08.2009 Bulletin 2009/33

(21)	Application number: 07851976.6

(22)	Date of filing: 12.11.2007

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International Patent Classification (IPC):

E21B 21/08^(2006.01)

(86)	International application number:
	PCT/NO2007/000399

(87)	International publication number:
	WO 2008/063072 (29.05.2008 Gazette 2008/22)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK RS

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Priority:

23.11.2006 NO 20065403

(71)	Applicant: StatoilHydro ASA
	4035 Stavanger (NO)

(72)	Inventor:
	DIRDAL, Rolf 4050 Sola (NO)

(74)	Representative: Ildahl, Bjørn Storm
	Tandbergs Patentkontor AS P.O. Box 7085 Majorstua N-0306 Oslo N-0306 Oslo (NO)

(54)	ASSEMBLY FOR PRESSURE CONTROL WHEN DRILLING AND METHOD TO CONTROL PRESSURE WHEN DRILLING IN A FORMATION WITH UNPREDICTABLE HIGH FORMATION PRESSURE