Button Resistivity
Button Resistivity : (n.) Formation Evaluation. The?resistivity?measured by the buttons of a measurements-while-drilling?(MWD) toroid device. Typically three buttons, each with a different depth of investigation, are mounted on a sleeve attached to the?drillstring, and by their nature are azimuthally focused. The measurement is similar to a?wireline microresistivity log, except that toroids are used instead of electrodes for transmitting and monitoring. The button resistivities are focused measurements with vertical resolutions and depths of investigation of a few inches. With three button measurements, it is possible to correct for the presence of?invasion, assuming a?step profile. See: azimuth, bit resistivity, electrode resistivity, ring resistivity
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