(19)

(11)

EP 3 230 553 A1

(12)

(43) Date of publication: 18.10.2017 Bulletin 2017/42 (21) Application number: 15820625.0 (22) Date of filing: 11.12.2015

(51) International Patent Classification (IPC):  E21B 19/07(2006.01) E21B 19/04(2006.01) E21B 19/12(2006.01) (86) International application number: PCT/IB2015/059554 (87) International publication number: WO 2016/092522 (16.06.2016 Gazette 2016/24)

(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 MD (30) Priority: 12.12.2014 GB 201422180 (71) Applicant: Claxton Engineering Services Limited Great Yarmouth, Norfolk NR30 1TE (GB)	(72) Inventors: YOUELL, Charles Lowestoft Suffolk NR33 9PH (GB) BROWN, Gregory Thetford Suffolk IP24 2NA (GB) (74) Representative: Dummett Copp LLP  25 The Square Martlesham Heath Ipswich IP5 3SL Ipswich IP5 3SL (GB)