(19)

(11)

EP 0 058 159 A1

(12)

(43) Date of publication: 25.08.1982 Bulletin 1982/34 (21) Application number: 81901390.0 (22) Date of filing: 21.08.1980

(51) International Patent Classification (IPC):  B63B 21/ 04( . ) E02B 17/ 00( . ) (86) International application number: PCT/US1980/001069 (87) International publication number: WO 1982/000675 (04.03.1982 Gazette 1982/07)

(84) Designated Contracting States: FR GB NL (71) Applicant: Exxon Production Research Company Houston Texas 77001 (US)	(72) Inventors: HAYES, Donald Andrew Houston, TX 77008 (US) FINN, Lyle David Houston, TX 77031 (US) BRINKMANN, Carl Rhys Houston, TX 77030 (US) (74) Representative: Field, Roger Norton (GB)  Carpmaels & Ransford 43 Bloomsbury Square GB-London WC1A 2RA GB-London WC1A 2RA (GB)