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(11)

EP 2 394 018 A1

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(43) Date of publication: 14.12.2011 Bulletin 2011/50 (21) Application number: 10700891.4 (22) Date of filing: 15.01.2010

(51) International Patent Classification (IPC):  E21B 21/00(2006.01) E21B 33/035(2006.01) E21B 21/08(2006.01) E21B 33/038(2006.01) (86) International application number: PCT/GB2010/000067 (87) International publication number: WO 2010/089525 (12.08.2010 Gazette 2010/32)

(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 MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 04.02.2009 GB 0901807 (71) Applicant: Expro North Sea Limited Dyce, Aberdeen AB21 0LQ (GB)	(72) Inventors: RICHARDS, Andrew Aberdeenshire AB31 5QB (GB) MAIR, Robin, Barclay Aberdeen AB10 6HU (GB) (74) Representative: Docherty, Andrew John et al Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)