FLOATING PLUG PRESSURE EQUALIZATION IN OILFIELD DRILL BITS - Patent 2791454

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EP 2 791 454 A1

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(43)	Date of publication:
	22.10.2014 Bulletin 2014/43

(21)	Application number: 11877296.1

(22)	Date of filing: 14.12.2011

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International Patent Classification (IPC):

E21B 10/22^(2006.01)
E21B 10/18^(2006.01)

E21B 10/24^(2006.01)
E21B 10/60^(2006.01)

(86)	International application number:
	PCT/US2011/064945

(87)	International publication number:
	WO 2013/089708 (20.06.2013 Gazette 2013/25)

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(71)	Applicant: Halliburton Energy Services, Inc.
	Houston, TX 77072 (US)

(72)	Inventor:
	CRAWFORD, Micheal B. Conroe, TX 77385 (US)

(74)	Representative: Bennett, Adrian Robert J. et al
	A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)

(54)	FLOATING PLUG PRESSURE EQUALIZATION IN OILFIELD DRILL BITS