(19)

(11)

EP 3 538 741 A1

(12)

(43) Date of publication: 18.09.2019 Bulletin 2019/38 (21) Application number: 17804744.5 (22) Date of filing: 09.11.2017

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) E21B 47/10(2012.01) E21B 47/06(2012.01) (86) International application number: PCT/US2017/060768 (87) International publication number: WO 2018/089576 (17.05.2018 Gazette 2018/20)

(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: 11.11.2016 US 201615349054 (71) Applicant: Saudi Arabian Oil Company Dhahran 31311 (SA)	(72) Inventors: XIAO, Jinjiang Dhahran 31311 (SA) SHEPLER, Randall, Alan Ras Tanura 31311 (SA) (74) Representative: Pinnington, Giles Oliver  Marks & Clerk LLP 1 New York Street Manchester M1 4HD Manchester M1 4HD (GB)