(19)
(11) EP 1 012 438 A1

(12)

(43) Date of publication:
28.06.2000 Bulletin 2000/26

(21) Application number: 98944704.0

(22) Date of filing: 03.09.1998
(51) International Patent Classification (IPC)7E21B 17/10, E21B 10/46
(86) International application number:
PCT/US9818/310
(87) International publication number:
WO 9913/194 (18.03.1999 Gazette 1999/11)
(84) Designated Contracting States:
BE GB IT

(30) Priority: 08.09.1997 US 924935
08.09.1997 US 925284
05.08.1998 US 129302
24.08.1998 US 139012

(71) Applicant: BAKER HUGHES INCORPORATED
HoustonTexas 77027 (US)

(72) Inventors:
  • SPAAR, John, R.
    Covington, LA 70435 (US)
  • NORRIS, James, A.
    Sandy, UT 84094 (US)
  • BEUERSHAUSEN, Christopher, C.
    Spring, TX 77386 (US)
  • OHANIAN, Michael, P.
    Slidell, LA 70458 (US)
  • PESSIER, Rudolph, C., O.
    The Woodlands, TX 77387 (US)
  • ILLERHAUS, Roland
    The Woodlands, TX 77387 (US)
  • LUND, Jeffrey, B.
    Salt Lake City, UT 84105 (US)
  • DOSTER, Michael, L.
    Spring, TX 77373 (US)
  • DYKSTRA, Mark, W.
    Kingwood, TX 77339 (US)

(74) Representative: Holmes, Matthew Peter et al
MARKS & CLERK,Sussex House,83-85 Mosley Street
Manchester M2 3LG
Manchester M2 3LG (GB)

   


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