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(11)

EP 4 121 633 A1

(12)

(43) Date of publication: 25.01.2023 Bulletin 2023/04 (21) Application number: 21712579.8 (22) Date of filing: 12.03.2021

(51) International Patent Classification (IPC):  E21B 43/26(2006.01) E21B 47/135(2012.01) E21B 47/113(2012.01) (52) Cooperative Patent Classification (CPC): E21B 2200/22; E21B 2200/20; E21B 43/26; E21B 47/135 (86) International application number: PCT/IB2021/052068 (87) International publication number: WO 2021/186309 (23.09.2021 Gazette 2021/38)

(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: KH MA MD TN (30) Priority: 18.03.2020 US 202062991538 P (71) Applicant: Chevron U.S.A. Inc. San Ramon, California 94583-0806 (US)

(72) Inventors: LIM CHEN NING, Ivan San Ramon, California 94583 (US) NEMETH, Tamas San Ramon, California 94583 (US) BARTEL, David C. San Ramon, California 94583 (US) ZHANG, Zhishuai San Ramon, California 94583 (US) TAN, Yunhui San Ramon, California 94583 (US) STEFANI, Joseph P. San Ramon, California 94583 (US) DISIENA, James P. San Ramon, California 94583 (US) BEVC, Dimitri San Ramon, California 94583 (US) HUGHES, Kelly San Ramon, California 94583 (US) (74) Representative: Haseltine Lake Kempner LLP  One Portwall Square Portwall Lane Bristol BS1 6BH Bristol BS1 6BH (GB)