Expandable centralizer for expandable pipe string

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(11)

EP 2 578 796 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	27.08.2014 Bulletin 2014/35

(43)	Date of publication A2:
	10.04.2013 Bulletin 2013/15

(21)	Application number: 13150396.3

(22)	Date of filing: 09.05.2008

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International Patent Classification (IPC):

E21B 17/10^(2006.01)

E21B 43/10^(2006.01)

(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:

16.05.2007 US 749544
26.07.2007 US 828943

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	11189762.5 / 2428637
	08769366.9 / 2158379

(71)	Applicant: Frank's International, Inc.
	Houston, TX 77042 (US)

(72)	Inventors:
	Buytaert, Jean Mineral Wells, TX Texas 76067 (US) Miller, Eugene Edward Weatherford, TX Texas 76086 (US) McDowell, Donald Elwin Millsap, TX Texas 76066 (US)

(74)	Representative: Dowling, Andrew
	Haseltine Lake LLP Lincoln House, 5th Floor 300 High Holborn London WC1V 7JH London WC1V 7JH (GB)

(54)	Expandable centralizer for expandable pipe string

(57) An expandable centralizer (8), comprising: a plurality of ribs, each having a first end (30A) and a second end (30B); a first expandable collar (10A) comprising a plurality of links (16) connected to the plurality of ribs at the first ends, at least some of the links of the first expandable collar being slidably coupled together; and a second expandable collar (10B) comprising a plurality of links (16) connected to the plurality of ribs at the second ends, at least some of the links of the second expandable collar being slidably coupled together, wherein at least the first expandable collar is configured to expand without substantial plastic deformation.

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