(19)

(11)

EP 3 143 238 A2

(12)

(88) Date of publication A3: 14.01.2016 (43) Date of publication: 22.03.2017 Bulletin 2017/12 (21) Application number: 15728580.0 (22) Date of filing: 14.05.2015

(51) International Patent Classification (IPC):  E21B 19/00(2006.01) E21B 19/07(2006.01) (86) International application number: PCT/GB2015/051418 (87) International publication number: WO 2015/173572 (19.11.2015 Gazette 2015/46)

(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 Designated Extension States: BA ME Designated Validation States: MA (30) Priority: 14.05.2014 GB 201408597 (71) Applicant: Claxton Engineering Services Limited Great Yarmouth NR30 1TE (GB)	(72) Inventor: MOYLES, Jason Paul Lowestoft Suffolk NR32 3NH (GB) (74) Representative: Dummett Copp LLP  25 The Square Martlesham Heath Ipswich IP5 3SL Ipswich IP5 3SL (GB)