(19)

(11)

EP 2 324 187 A2

(12)

(88) Date of publication A3: 02.12.2010 (43) Date of publication: 25.05.2011 Bulletin 2011/21 (21) Application number: 09784895.6 (22) Date of filing: 06.08.2009

(51) International Patent Classification (IPC):  E21B 17/06(2006.01) E21B 34/10(2006.01) E21B 23/04(2006.01) (86) International application number: PCT/GB2009/001949 (87) International publication number: WO 2010/018366 (18.02.2010 Gazette 2010/07)

(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 Designated Extension States: AL BA RS (30) Priority: 13.08.2008 GB 0814822 (71) Applicant: Pilot Drilling Control Limited Suffolk NR32 3LZ (GB)	(72) Inventor: SWIETLIK, George Suffolk NR32 3PL (GB) (74) Representative: Giles, Ashley Simon  Haseltine Lake LLP Lincoln House, 5th Floor 300 High Holborn London WC1V 7JH London WC1V 7JH (GB)