(19)

(11)

EP 2 723 973 A2

(12)

(88) Date of publication A3: 03.01.2014 (43) Date of publication: 30.04.2014 Bulletin 2014/18 (21) Application number: 12746121.8 (22) Date of filing: 25.06.2012

(51) International Patent Classification (IPC):  E21B 23/06(2006.01) E21B 33/134(2006.01) (86) International application number: PCT/IB2012/053191 (87) International publication number: WO 2012/176173 (27.12.2012 Gazette 2012/52)

(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 RS SE SI SK SM TR (30) Priority: 23.06.2011 NO 20110908 (71) Applicant: Archer Oil Tools As 4068 Stavanger (NO)	(72) Inventors: HANSEN, Tor Eivind N-4317 Sandnes (NO) KLIMAS, Krzysztof N-4326 Sandnes (NO) (74) Representative: Onsagers AS  Munkedamsveien 35 P.O. Box 1813 Vika 0123 Oslo 0123 Oslo (NO)