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(11)

EP 3 149 270 A2

(12)

(88) Date of publication A3: 16.06.2016 (43) Date of publication: 05.04.2017 Bulletin 2017/14 (21) Application number: 15726267.6 (22) Date of filing: 27.05.2015

(51) International Patent Classification (IPC):  E21B 41/00(2006.01) E21B 23/14(2006.01) E21B 43/1185(2006.01) (86) International application number: PCT/GB2015/051539 (87) International publication number: WO 2015/181541 (03.12.2015 Gazette 2015/48)

(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: 27.05.2014 GB 201409382 (71) Applicant: Well-Sense Technology Limited Aberdeen AB10 1DQ (GB)	(72) Inventor: MAIR, Robin Barclay Aberdeen AB10 6HU (GB) (74) Representative: Docherty, Andrew John et al Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)