DRILLING SYSTEM WITH A BARREL DRILLING HEAD DRIVEN BY A DOWNHOLE TRACTOR - Patent 2140100

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EP 2 140 100 A2

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(88)	Date of publication A3:
	05.02.2009

(43)	Date of publication:
	06.01.2010 Bulletin 2010/01

(21)	Application number: 08734517.9

(22)	Date of filing: 28.04.2008

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International Patent Classification (IPC):

E21B 25/00^(2006.01)

E21B 23/14^(2006.01)

(86)	International application number:
	PCT/DK2008/000160

(87)	International publication number:
	WO 2008/131772 (06.11.2008 Gazette 2008/45)

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

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Priority:

26.04.2007 DK 200700615

(71)	Applicant: Welltec A/S
	3450 Allerød (DK)

(72)	Inventor:
	HALLUNDBAEK, Jorgen DK-3230 Graested (DK)

(74)	Representative: Hoffmann, Claus
	Hoffmann Dragsted ApS Rådhuspladsen 16 1550 Copenhagen V 1550 Copenhagen V (DK)

(54)	DRILLING SYSTEM WITH A BARREL DRILLING HEAD DRIVEN BY A DOWNHOLE TRACTOR