PROCEDURE FOR ELECTRIC LOGGING IN CASED WELLS Russian patent published in 2011 - IPC G01V3/20 

FIELD: oil and gas production.

SUBSTANCE: at logging there is used a probe consisting of five and more equidistant measuring electrodes and of two current electrodes located beyond boundaries of measuring electrodes zone. At one measurement separate determination of specific electric rock resistance is performed with supply of current into the string via the current electrodes for each of equidistant three measuring electrodes. Results of measurements of high-ohm interval are more precisely defined according to a corresponding formula.

EFFECT: increased speed of logging survey, and expanded range of measurements.

2 cl, 3 dwg