Enhancement of dynamic range of electrode measurements

A non-transitory machine-readable storage device having instructions stored thereon, which, when executed by one or more processors of a machine, cause the machine to perform operations, the operations comprising:

• controlling current in a set of three current electrodes forming a bi-pole to inject current into a formation around a pipe in a wellbore, the three current electrodes disposed on the pipe in the wellbore such that two current electrodes of the three current electrodes inject current and the third current electrode is operatively arranged as a current return, the three current electrodes associated with a set of two monitor electrodes, the two monitor electrodes being two current electrodes of the set of three current electrodes or two electrodes different from the set of three current electrodes,
• interrogating an optical fiber, the optical fiber extending along the longitudinal axis of the pipe with a portion of the optical fiber associated with the set of three current electrodes in a sensing operation using the set of three current electrodes;
• determining progression of waterflood with respect to the wellbore from controlling the current and interrogating the optical fiber over time;
• and
• operating a processor to determine waterflood distance and resistivity that minimizes misfit between bucked measurements and synthetic data, the synthetic data generated using a model that includes simulation of operation of the set of three current electrodes in the formation, the bucked measurements generated using the controlling of the current of the set of three current electrodes and interrogating the optical fiber over time.

A system comprising:

• a set of electrodes disposed on a pipe in a wellbore, the set having three current electrodes operable to inject current into a formation around the pipe in the wellbore with one of the three current electrodes of the set operatively arranged as a return, the set arranged to include two monitor electrodes, the two monitor electrodes being two current electrodes of the three current electrodes or two electrodes different from the three current electrodes;
• an optical fiber extending along the longitudinal axis of the pipe with a portion of the optical fiber associated with the set of electrodes in a sensing operation of the set of electrodes;
• a set of processors arranged to control the injection of current by the three current electrodes, to control interrogation of the optical fiber over time, and to determine progression of waterflood with respect to the wellbore;
• and
• the processors being further arranged to determine watt Mood distance and resistivity that minimizes misfit between bucked measurements and synthetic data, the synthetic data generated by use of aa model that includes simulation of operation of the set of three current electrodes in the formation, the bucked measurements generated by use of control of current in the set of three current electrodes and interrogation of the optical fiber over time.