(19)

(11)

EP 2 681 407 A2

(12)

(88) Date of publication A3: 07.11.2013 (43) Date of publication: 08.01.2014 Bulletin 2014/02 (21) Application number: 12716519.9 (22) Date of filing: 02.03.2012

(51) International Patent Classification (IPC):  E21B 23/14(2006.01) E21B 4/18(2006.01) E21B 31/107(2006.01) (86) International application number: PCT/GB2012/050472 (87) International publication number: WO 2012/120282 (13.09.2012 Gazette 2012/37)

(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: 04.03.2011 GB 201103735 24.06.2011 GB 201110772 (71) Applicant: McNay, Graeme Abderdeen Aberdeenshire AB24 4SG (GB)	(72) Inventor: McNay, Graeme Abderdeen Aberdeenshire AB24 4SG (GB) (74) Representative: Harrison Goddard Foote LLP  Belgrave Hall Belgrave Street Leeds LS2 8DD Leeds LS2 8DD (GB)