Portable drilling mast structure, rig and method for erecting

(19)

(11)

EP 1 752 608 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	03.10.2007 Bulletin 2007/40

(43)	Date of publication A2:
	14.02.2007 Bulletin 2007/07

(21)	Application number: 06254211.3

(22)	Date of filing: 10.08.2006

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International Patent Classification (IPC):

E21B 7/02^(2006.01)

(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 NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK YU

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Priority:

11.08.2005 US 707351 P

(71)	Applicant: NATIONAL-OILWELL, L.P.
	Houston, TX 77042 (US)

(72)	Inventor:
	Belik, Jaroslav Pearland, Texas 77584 (US)

(74)	Representative: Flint, Adam
	Beck Greener Fulwood House, 12 Fulwood Place, London WC1V 6HR London WC1V 6HR (GB)

(54)	Portable drilling mast structure, rig and method for erecting

(57) A portable drilling mast structure (200) has a lower drilling mast (202) having a lower end pivotally coupled to a base (110). A hinge (206) is coupled to an upper end of the lower drilling mast (202) and a lower end of an upper drilling mast (204). The drilling mast structure (200) has a first position in which the lower drilling mast (202) is parallel to the base (110) and the upper drilling mast (204) is disposed between the lower drilling mast (202) and the base (110). The drilling mast structure (200) has a second position wherein the lower drilling mast (202) is perpendicular to the base (110) and the upper drilling mast (204) is aligned with the lower drilling mast (202).

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