(19)

(11)

EP 3 289 172 A1

(12)

(43) Date of publication: 07.03.2018 Bulletin 2018/10 (21) Application number: 16784115.4 (22) Date of filing: 26.04.2016

(51) International Patent Classification (IPC):  E21B 34/12(2006.01) E21B 34/10(2006.01) (86) International application number: PCT/US2016/029349 (87) International publication number: WO 2016/172736 (27.10.2016 Gazette 2016/43)

(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: 27.04.2015 US 201514697289 (71) Applicant: Tejas Research and Engineering LLC The Woodlands, TX 77380 (US)	(72) Inventors: MAILAND, Jason, Charles The Woodlands, TX 77381 (US) HILL, Thomas, G. Conroe, TX 77304 (US) (74) Representative: Mansfield, Peter Turquand  Coller IP Management Limited Fugro House Hithercroft Road Wallingford, Oxfordshire OX10 9RB Wallingford, Oxfordshire OX10 9RB (GB)