Shoulder effect logging method

Details Shoulder effect logging method Shoulder effect logging method

1992-07-16

1995-08-29

Hayes, Gail O.

Boots, shoes, and leggings

324338, 324339, 73151, 367 15, G06F 1700, G01V 310, E21B 4700

Patent

active

054466547

ABSTRACT:
In a resistivity log, a curve is obtained showing the values of resistivity where adjacent beds impact the measured resistivity. The curve as a function of well depth is first converted into a rectangularized curve so that the interfaces of the adjacent strata are located, and by a suitable number of iterations, a correction factor is applied. The corrected rectangular log is obtained with a correction coefficient computed at each depth. For each computation, the impact of all the strata within a specified depth window is considered, while strata beyond that window are simplified by representing the strata beyond the window with single equivalent bed values to reduce the number of computations required. This then provides a resistivity log which is substantially free of shoulder bed effect.

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patent: 5105356 (1992-04-01), Maute et al.
patent: 5146167 (1992-09-01), Strickland et al.
Tumer, K. et al, A New Algorithm for Automatic Shoulder Bed Correction of Dual Laterolog Tools, SPWLA 32nd Annual Logging Symposium, Jun. 16-19, 1991.
Crary, S. F. et al, The Use of Electromagnetic Modeling to Validate Environmental Corrections for the Dual Laterolog, SPWLA, 31st Annual Logging Symposium, Jun. 24-27, 1990.
Cosmo, C. et al, Fast Deconvolution of Laterologs By Direct Inverse Filtering, SPWLA, 32nd Annual Logging Symposium, Jun. 16-19, 1991.
Chemali, R. et al. The Shoulder Bed Effect on the Dual Laterolog and Its Variation with the Resistivity of the Borehole Fluid, SPWLA, 24th Annual Logging Symposium, Jun. 27-30, 1983.
Gianzero, S. C. et al. A New High-Speed Hybrid Terchnique for Simulation and Inversion of Resistivity Logs, 60th Annual Technical Conference and Exhibition of the Society of Petroleum Engineers, Las Vegas, Nevada, Sep. 22-25, 1985.
Coggon, J. H., Electromagnetic and Electrical Modeling by the Finite Element Method, Geophysics, vol. 26, No. 1, pp. 132-155, Feb. 1971.

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