An inhomogeneous background based focusing method for...

Details An inhomogeneous background based focusing method for... An inhomogeneous background based focusing method for...

G - Physics

01

V

G01V 3/38 (2006.01) G01V 3/28 (2006.01)

Patent

CA 2439619

In highly deviated wells or when the relative dip angle between formation layering and wellbore axis is large, array induction measurements exhibit erratic spikes, misleading curve separations, and inaccurate resistivity values, preventing log analysts from accurately evaluating invasion and formation resistivities. Our newly developed deviated-well software focusing (DSF) method that is derived from the Born approximation simultaneously accounts for all these dipping effects. The induction response is separated into two portions: a background response and a perturbation response. An inhomogeneous, anisotropic background formation model is used to calculate the background response, and the perturbation response is interpreted through a software focusing technique. The combination of the two solutions is the final result.

Selon la présente invention, dans des puits de forage fortement déviés (2) ou lorsque l'angle d'inclinaison relatif entre la stratification du terrain (4) et l'axe du puits de forage est grand, les mesures d'induction de rangée présentent des pointes erratiques, des séparations de courbes trompeuses, et des valeurs de résistivité imprécises, empêchant les diagraphistes (Fig. 3) d'évaluer précisément les résistivités d'invasion et de formation. Pour résoudre ces problèmes, divers procédés de correction et diverses techniques d'inversion ont été développés. Cependant, les procédés de correction, permettent seulement d'obtenir des résultats satisfaisants lorsque l'angle d'inclinaison relatif (205) est faible à modéré, et les techniques d'inversion sont généralement très chronophages.

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