(19)
(11) EP 1 390 712 A1

(12)

(43) Date of publication:
25.02.2004 Bulletin 2004/09

(21) Application number: 02726746.7

(22) Date of filing: 15.04.2002
(51) International Patent Classification (IPC)7: G01N 3/20
(86) International application number:
PCT/US2002/011727
(87) International publication number:
WO 2002/086459 (31.10.2002 Gazette 2002/44)
(84) Designated Contracting States:
FR IT NL

(30) Priority: 18.04.2001 US 836980
01.02.2002 US 353245 P
04.03.2002 US 90374

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

(72) Inventors:
  • EVANS, Martin T.
    Norwich NR7 0ZE (GB)
  • BURT, Andrew R.
    Oulton Broad Lowestoft NR 32 3JX (GB)
  • ALEXY, Albert
    Katy, TX 77450 (US)
  • TABAROVSKY, Leonty, A.
    Houston, TX 77079 (US)

(74) Representative: Vigars, Christopher Ian et al
Haseltine Lake,Imperial House, 15-19 Kingsway
London WVC2B 6UD
London WVC2B 6UD (GB)

   


(54) AN APPARATUS AND METHOD FOR WELLBORE RESISTIVITY DETERMINATION AND IMAGING USING CAPACITIVE COUPLING