(19)

(11)

EP 2 094 932 A1

(12)

(43) Date of publication: 02.09.2009 Bulletin 2009/36 (21) Application number: 07858352.3 (22) Date of filing: 18.12.2007

(51) International Patent Classification (IPC):  E21B 7/02(2006.01) (86) International application number: PCT/FI2007/050701 (87) International publication number: WO 2008/074918 (26.06.2008 Gazette 2008/26)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR (30) Priority: 19.12.2006 FI 20060506 U (71) Applicant: Stonego Oy 04300 Tuusula (FI)	(72) Inventor: KUOSMANEN, Seppo 04300 Tuusula (FI) (74) Representative: Hovi, Simo Pekka Tapani  Seppo Laine Oy, Itämerenkatu 3 B 00180 Helsinki 00180 Helsinki (FI)