(19)

(11)

EP 2 478 184 A1

(12)

(43) Date of publication: 25.07.2012 Bulletin 2012/30 (21) Application number: 10768793.1 (22) Date of filing: 15.09.2010

(51) International Patent Classification (IPC):  E21B 47/06(2012.01) E21B 34/06(2006.01) (86) International application number: PCT/GB2010/001734 (87) International publication number: WO 2011/033257 (24.03.2011 Gazette 2011/12)

(84) Designated Contracting States: AL 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: 16.09.2009 GB 0916242 (71) Applicant: Tendeka B.V. Altens, Aberdeen AB12 3HT (GB)	(72) Inventors: WATLEY, Daniel Essex CM3 4RN (GB) CARTER, Neale Aberdeen AB12 3HT (GB) (74) Representative: Docherty, Andrew John  Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)