(19)

(11)

EP 2 074 276 A1

(12)

(43) Date of publication: 01.07.2009 Bulletin 2009/27 (21) Application number: 07747573.9 (22) Date of filing: 22.03.2007

(51) International Patent Classification (IPC):  E21B 21/10(2006.01) E21B 19/16(2006.01) E21B 34/00(2006.01) (86) International application number: PCT/NO2007/000112 (87) International publication number: WO 2007/108703 (27.09.2007 Gazette 2007/39)

(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 MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 23.03.2006 NO 20061333 (71) Applicant: Peak Well Solutions AS 4098 Tananger (NO)	(72) Inventors: REVHEIM, Sven N-4042 Hafrsfjord (NO) BAKKEN, Sverre N-4011 Stavanger (NO) (74) Representative: Olsen, Svein Arne  Bryn Aarflot AS P.O. Box 449 Sentrum 0104 Oslo 0104 Oslo (NO)