(19)

(11)

EP 2 616 628 A2

(12)

(88) Date of publication A3: 09.08.2012 (43) Date of publication: 24.07.2013 Bulletin 2013/30 (21) Application number: 11825907.6 (22) Date of filing: 15.09.2011

(51) International Patent Classification (IPC):  E21B 21/06(2006.01) E21B 43/40(2006.01) (86) International application number: PCT/US2011/051676 (87) International publication number: WO 2012/037301 (22.03.2012 Gazette 2012/12)

(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 (30) Priority: 15.09.2010 US 383196 P (71) Applicant: M.I L.L, C. Houston, TX 77072 (US)	(72) Inventor: SHERWOOD, Joe Columbus, TX 78934 (US) (74) Representative: Ljungberg, Robert  Murgitroyd & Company Scotland House 165-169 Scotland Street Glasgow Strathclyde G5 8PL Glasgow Strathclyde G5 8PL (GB)