(19)

(11)

EP 2 245 261 A1

(12)

(43) Date of publication: 03.11.2010 Bulletin 2010/44 (21) Application number: 09703600.8 (22) Date of filing: 22.01.2009

(51) International Patent Classification (IPC):  E21B 23/06(2006.01) E21B 33/1295(2006.01) E21B 33/12(2006.01) (86) International application number: PCT/NO2009/000025 (87) International publication number: WO 2009/093912 (30.07.2009 Gazette 2009/31)

(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 TR Designated Extension States: AL BA RS (30) Priority: 24.01.2008 NO 20080452 (71) Applicant: Well Technology AS 4033 Stavanger (NO)	(72) Inventors: TINNEN, Bård, Martin N-4017 Stavanger (NO) SØRTVEIT, Håvar N-4310 Hommersåk (NO) (74) Representative: Håmsø Patentbyrå ANS  Postboks 171 4302 Sandnes 4302 Sandnes (NO)