Method for 2d inversion of dual laterolog measurements
CA 2423567 C · Owner: Yin, Hezhu · Inventors: Wang, Hanming; Yin, Hezhu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A 2D inversion of true formation resistivity from dual laterolog tool measurements is accomplished using a pre-calculated look-up table 104. An initial earth model is derived and divided into intervals 102. A 2D tool response is calculated in each interval using the earth model 108. Matching is checked between the calculated 2D tool response and the tool measurements 104. The following steps are iterated until the match is satisfactory. A 1D radial tool response is derived in each interval using the precalculated look-up table 105. Shoulder bed effects are approximated in each interval by subtracting the 1D radial tool response from the 2D tool response 106. A nonlinear least square …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed September 25, 2001 and granted May 1, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 25, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2023.
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