METHOD FOR DETERMINING INTERVAL AND QUALITY OF CASING PERFORATION IN A WELL Russian patent published in 2023 - IPC E21B47/10 

FIELD: geophysics.

SUBSTANCE: invention is aimed at improving the accuracy of determining the intervals and the quality of perforation of production casing strings in wells. To achieve the technical result, the registration of the signal of the difference in electric potentials of the casing string is carried out with simultaneous acoustic impact on the studied perforation zone using a megaelectrode unit, a deep probe device with remote pressure measuring non-polarizable electrodes in the amount of 40 pieces located radially to the axis of the device, which ensures the measurement of the values of the difference in electrical potentials directly at the boundaries of the formation and perforated walls of the well to achieve the most pronounced anomalies in the well logs. The determination of the boundaries and the assessment of the degree of hydrodynamic connectivity of the formation with the internal cavity of the casing string is carried out by changing the magnitude of the difference in electrical potentials at a qualitative level by comparative analysis of the three diagrams obtained.

EFFECT: increase of accuracy of determining the boundaries of perforation intervals and the information content of production geophysical studies in terms of assessing the hydrodynamic connectivity of productive formations with the internal cavity of the casing string.

1 cl, 2 dwg