(19)

(11)

EP 0 204 760 A1

(12)

(43) Date of publication: 17.12.1986 Bulletin 1986/51 (21) Application number: 85906092.0 (22) Date of filing: 04.12.1985

(51) International Patent Classification (IPC):  E21B 47/ 00( . ) E21B 47/ 12( . ) E21B 47/ 06( . ) E21B 49/ 08( . ) (86) International application number: PCT/NO1985/000076 (87) International publication number: WO 1986/003545 (19.06.1986 Gazette 1986/13)

(84) Designated Contracting States: DE FR GB IT NL SE (30) Priority: 04.12.1984 NO 19840004838 (71) Applicant: SAGA PETROLEUM A.S. N-1322 Hovik (NO)	(72) Inventor: KUMLE, Per N-1370 Asker (NO) (74) Representative: Rostovanyi, Peter, et al  AWAPATENT AB, Box 5117 S-200 71 Malmö S-200 71 Malmö (SE)