(19)

(11)

EP 2 643 540 A2

(12)

(88) Date of publication A3: 03.01.2013 (43) Date of publication: 02.10.2013 Bulletin 2013/40 (21) Application number: 11804733.1 (22) Date of filing: 28.11.2011

(51) International Patent Classification (IPC):  E21B 10/30(2006.01) E21B 10/34(2006.01) (86) International application number: PCT/GB2011/001655 (87) International publication number: WO 2012/069795 (31.05.2012 Gazette 2012/22)

(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: 26.11.2010 GB 201020129 (71) Applicant: Simpson, Neil Andrew Abercrombie Portlethen, Aberdeen AB12 4QX (GB)	(72) Inventor: Simpson, Neil Andrew Abercrombie Portlethen, Aberdeen AB12 4QX (GB) (74) Representative: Shanks, Andrew  Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)