METHOD OF DETECTING WELLS FLOODED BY BEHIND-THE-CASING FLOWS Russian patent published in 2020 - IPC E21B47/10 G06F30/20 

FIELD: investigation of wells.

SUBSTANCE: invention relates to investigation of wells, namely to detection of wells flooded by behind-the-casing flows between beds. Method includes investigation of selected wells for detection based on statistical analysis of wells with suspected presence of behind-the-casing flows, in which field geophysical survey is carried out to detect behind-the-casing flows of liquid. Said wells include both injection wells, and statistical analyzes are carried out from analysis of compliance of statistical dependences of intake capacity on permeability for selected deposit to production and injection wells, in wells with deviation of selected values above allowable error determined empirically for each deposit. Water is injected with pressure from zero to saturation pressure, but not higher than fracture pressure of said formation, determining dependence of injection volumes on injection pressure with subsequent comparison of the saturation section with a statistically averaged similar standard dependence for the selected deposit to identify wells with suspected presence of behind-the-casing flows, with inadmissible deviations from the curvature of typical dependency ratios.

EFFECT: enlarging functional capabilities beyond the set of involvement into injection and injection wells, reducing the percentage of unproductive geophysical investigations, increasing the percentage of detected wells with behind-the-casing flows.

1 cl, 4 dwg