(19)

(11)

EP 2 635 765 A2

(12)

(88) Date of publication A3: 20.12.2012 (43) Date of publication: 11.09.2013 Bulletin 2013/37 (21) Application number: 11785769.8 (22) Date of filing: 25.10.2011

(51) International Patent Classification (IPC):  E21B 17/01(2006.01) E21B 47/12(2012.01) F16L 11/16(2006.01) E21B 47/06(2012.01) E21B 47/00(2012.01) (86) International application number: PCT/GB2011/052070 (87) International publication number: WO 2012/059736 (10.05.2012 Gazette 2012/19)

(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: 03.11.2010 GB 201018534 (71) Applicant: Wellstream International Limited Newcastle-upon-Tyne NE6 3PF (GB)

(72) Inventors: GRAHAM, Geoffrey Stephen Newcastle-upon-tyne, Tyne and Wear NE6 3PF (GB) DATON-LOVETT, Andrew James Lymington, Hampshire SO41 8JY (GB) FERNANDO, Upul Shanthilal Newcastle-upon-tyne, Tyne and Wear NE6 3PF (GB) KARABELAS, George Newcastle-upon-tyne, Tyne and Wear NE6 3PF (GB) HOLLAND, Gary Michael Newcastle-upon-tyne, Tyne and Wear NE6 3PF (GB) CLEMENTS, Richard Alasdair Newcastle-upon-tyne, Tyne and Wear NE6 3PF (GB) (74) Representative: Uno, Jennifer Elizabeth Hayes et al Harrison Goddard Foote LLP Saviour House 9 St Saviourgate York, YO1 8NQ York, YO1 8NQ (GB)