(19)

(11)

EP 3 400 370 A1

(12)

(43) Date of publication: 14.11.2018 Bulletin 2018/46 (21) Application number: 17711733.0 (22) Date of filing: 20.02.2017

(51) International Patent Classification (IPC):  E21B 43/01(2006.01) E21B 19/00(2006.01) (86) International application number: PCT/GB2017/050429 (87) International publication number: WO 2017/141056 (24.08.2017 Gazette 2017/34)

(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: 19.02.2016 GB 201602949 30.06.2016 GB 201611438 (71) Applicant: Oil States Industries (UK) Ltd Aberdeen, AB12 3LH (GB)	(72) Inventors: JOHNSTON, Richard Broxburn West Lothan EH52 5QY (GB) ROBERTSON, Craig Wishaw North Lancashire ML2 0QL (GB) GALLAGHER, John Aberdeen Aberdeenshire AB11 7RS (GB) (74) Representative: Murgitroyd & Company  Scotland House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)