(19)

(11)

EP 0 898 737 A1

(12)

(43) Date of publication: 03.03.1999 Bulletin 1999/09 (21) Application number: 98908632.0 (22) Date of filing: 20.02.1998

(51) International Patent Classification (IPC):  G05B 13/ 04( . ) G06N 5/ 04( . ) G06N 3/ 04( . ) E21B 41/ 00( . ) (86) International application number: PCT/US1998/003356 (87) International publication number: WO 1998/037465 (27.08.1998 Gazette 1998/34)

(84) Designated Contracting States: DE FR GB (30) Priority: 21.02.1997 US 19970037355P 07.10.1997 US 19970061285P (71) Applicant: BAKER HUGHES INCORPORATED Houston Texas 77027 (US)	(72) Inventors: HALES, Lynn, B. Salt Lake City, UT 84108 (US) YNCHAUSTI, Randy, A. Centerville, UT 84014 (US) FOOT, Donald, G., Jr. Fruit Heights, UT 84037 (US) (74) Representative: Ebbinghaus, Dieter, Dipl.-Ing., et al  Patentanwälte v. Füner, Ebbinghaus, Finck, Mariahilfplatz 2 & 3 81541 München 81541 München (DE)