(19)

(11)

EP 2 943 645 A2

(12)

(88) Date of publication A3: 31.12.2014 (43) Date of publication: 18.11.2015 Bulletin 2015/47 (21) Application number: 14701656.2 (22) Date of filing: 10.01.2014

(51) International Patent Classification (IPC):  E21B 37/00(2006.01) E21B 7/18(2006.01) (86) International application number: PCT/US2014/011147 (87) International publication number: WO 2014/110444 (17.07.2014 Gazette 2014/29)

(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 (30) Priority: 11.01.2013 US 201313739795 (71) Applicant: Weatherford Technology Holdings, LLC Houston, TX 77056 (US)	(72) Inventors: MAHMOOD, Azfar Abu Dhabi (AE) IMTIAZ, Khalid Abu Dhabi (AE) BHADRAN, Santosh Abu Dhabi (AE) SHAHNAWAZ, Mir Mohammed Hussain Abu Dhabi (AE) (74) Representative: Talbot-Ponsonby, Daniel Frederick  Marks & Clerk LLP Fletcher House Heatley Road The Oxford Science Park Oxford OX4 4GE Oxford OX4 4GE (GB)