PERCUSSIVE DRILL BIT, DRILLING SYSTEM COMPRISING SUCH A DRILL BIT AND METHOD OF DRILLING A BORE HOLE - Patent 1627130

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EP 1 627 130 A1

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(43)	Date of publication:
	22.02.2006 Bulletin 2006/08

(21)	Application number: 04741645.8

(22)	Date of filing: 25.05.2004

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International Patent Classification (IPC):

E21B 10/36^(1980.01)

E21B 10/38^(1980.01)

(86)	International application number:
	PCT/EP2004/050912

(87)	International publication number:
	WO 2004/104362 (02.12.2004 Gazette 2004/49)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

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Priority:

26.05.2003 EP 03076614

(71)	Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
	2596 HR Den Haag (NL)

(72)	Inventor:
	CRUZ, Antonio Maria Guimaraes Leite NL-2288 GD Rijswijk (NL)

(54)	PERCUSSIVE DRILL BIT, DRILLING SYSTEM COMPRISING SUCH A DRILL BIT AND METHOD OF DRILLING A BORE HOLE