(19)

(11)

EP 2 356 309 A1

(12)

(43) Date of publication: 17.08.2011 Bulletin 2011/33 (21) Application number: 09752221.3 (22) Date of filing: 06.11.2009

(51) International Patent Classification (IPC):  E21B 33/038(2006.01) E21B 33/047(2006.01) E21B 33/04(2006.01) E21B 33/068(2006.01) (86) International application number: PCT/GB2009/051492 (87) International publication number: WO 2010/052502 (14.05.2010 Gazette 2010/19)

(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 SM TR (30) Priority: 07.11.2008 GB 0820407 (71) Applicant: Caledyne Limited Bridge of Don, Aberdeen AB23 8JX (GB)	(72) Inventors: STEWART, Daniel Aberdeen AB25 3SD (GB) VAN DORT, Roland Stonehaven AB39 3SR (GB) (74) Representative: Harrison Goddard Foote  Delta House 50 West Nile Street Glasgow G1 2NP 50 West Nile Street Glasgow G1 2NP (GB)