(19)

(11)

EP 3 265 648 A2

(12)

(88) Date of publication A3: 24.11.2016 (43) Date of publication: 10.01.2018 Bulletin 2018/02 (21) Application number: 16712989.9 (22) Date of filing: 02.03.2016

(51) International Patent Classification (IPC):  E21B 43/01(2006.01) E21B 21/10(2006.01) E21B 43/10(2006.01) (86) International application number: PCT/GB2016/050548 (87) International publication number: WO 2016/142656 (15.09.2016 Gazette 2016/37)

(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 Designated Extension States: BA ME Designated Validation States: MA MD (30) Priority: 06.03.2015 GB 201503844 (71) Applicant: Oil States Industries (UK) Ltd Aberdeen AB12 3LH (GB)	(72) Inventor: STEPHEN, Garry Robert Montrose Tayside DD10 9AW (GB) (74) Representative: Murgitroyd, George Edward  Murgitroyd & Company Scotland House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)