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1. (WO2017184938) ESTIMATION OF ELECTROMAGNETIC TOOL SENSITIVITY RANGE

Pub. No.:    WO/2017/184938    International Application No.:    PCT/US2017/028763
Publication Date: Fri Oct 27 01:59:59 CEST 2017 International Filing Date: Sat Apr 22 01:59:59 CEST 2017
IPC: E21B 47/00
G01V 3/26
G01V 3/38
Applicants: BAKER HUGHES, A GE COMPANY, LLC
Inventors: MARTAKOV, Sergey
SVIRIDOV, Mikhail Vladimirovich
Title: ESTIMATION OF ELECTROMAGNETIC TOOL SENSITIVITY RANGE
Abstract:
A system and method to control drilling based on determining a sensitivity range of an electromagnetic tool include obtaining a resistivity model over an interval of depths, obtaining an original tool response from the resistivity model over the interval of depths for a tool configuration, and positioning an artificial layer in the resistivity model to generate a modified resistivity model. The method also includes obtaining a modified tool response from the modified resistivity model and iteratively performing the positioning the artificial layer and the obtaining the modified tool response, estimating the sensitivity range according to a position of the artificial layer when a normalized difference between the original tool response and the modified tool response reaches a threshold value, and assigning a different confidence level to information obtained from the resistivity model beyond the sensitivity range and controlling the drilling based on the resistivity model and the confidence level.