Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Patent
1998-10-08
2000-08-01
Oda, Christine
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
324339, G01V 100
Patent
active
060980192
ABSTRACT:
A method of determining electric resistivity of an earth formation (1) surrounding a wellbore filled with a wellbore fluid, is provided, which method comprises: operating a resistivity logging tool (2) in the wellbore so as to provide a plurality of resistivity logs (FLG.sub.1, . . . , n) (3) of the earth formation (1) for different radial intervals (1, . . . , n) relative to the wellbore; for each radial interval (k), selecting a modelled resistivity profile (Rmod.sub.k) (4); inputting the modelled resistivity profiles (Rmod.sub.1, . . . , n) (4) to a logging tool simulator (6) so as to provide for each radial interval (k) a modelled resistivity log (MLG.sub.k) (7) having a depth of investigation corresponding to the radial interval (k); for each radial interval (k) updating the modelled resistivity profile (Rmod.sub.k) (7) in dependence of an observed deviation of the resistivity log (FLG.sub.k) (3) from the modelled resistivity log (MLG.sub.k) (7); and repeating steps c)-d) until for each radial interval (k) the difference between the resistivity log (FLG.sub.k) (3) and the corresponding modelled resistivity log (MLG.sub.k) (7) is below a selected threshold value (8).
REFERENCES:
patent: 4340934 (1982-07-01), Segesman
patent: 4517836 (1985-05-01), Lyle, Jr. et al.
patent: 5064006 (1991-11-01), Waters et al.
patent: 5210691 (1993-05-01), Freedman et al.
patent: 5325714 (1994-07-01), Lende et al.
patent: 5355088 (1994-10-01), Howard, Jr.
patent: 5446654 (1995-08-01), Chemali et al.
patent: 5585727 (1996-12-01), Fanini et al.
International Search Report dated Dec. 22, 1998.
Hakvoort Richard Gerrit
Koelman Johannes Maria Vianney Antonius
Oda Christine
Shell Oil Company
Taylor Victor J.
LandOfFree
Resistivity log correction method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Resistivity log correction method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resistivity log correction method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-673161