(19)

(11)

EP 2 900 782 A1

(12)

(43) Date of publication: 05.08.2015 Bulletin 2015/32 (21) Application number: 13839421.8 (22) Date of filing: 24.09.2013

(51) International Patent Classification (IPC):  C09K 8/035(2006.01) E21B 43/22(2006.01) E21B 21/00(2006.01) (86) International application number: PCT/CA2013/050729 (87) International publication number: WO 2014/043819 (27.03.2014 Gazette 2014/13)

(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: 24.09.2012 US 201213625822 24.09.2012 CA 2790760 27.09.2012 US 201261706493 P (71) Applicant: Synoil Fluids Holdings Inc. Calgary, Alberta T2P 3R7 (CA)	(72) Inventors: MESHER, Shaun T. Calgary, Alberta T2P 3C4 (CA) STEWARD, Olivia Frome, Somerset BA11 2LX (GB) FIRTH, Daniel St Andrews, Fife KY16 8RR (GB) MORAN, Robert St. Helens, Merseyside WA10 3RS (GB) (74) Representative: Rankin, Douglas  Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)