METHOD FOR DETERMINING INTENSITY OF OPERATING INTERVALS, INFLOW PROFILE IN PRODUCTION WELL AND INJECTIVITY IN INJECTION WELL, PRESENCE OF BEHIND- -CASING FLOWS Russian patent published in 2024 - IPC E21B47/07 E21B47/103 

FIELD: oil production industry.

SUBSTANCE: monitoring the development of oil fields using field geophysical methods of well exploration. A method for determining the intensity of operating intervals, the inflow profile in a production well and injectivity in an injection well, the presence of behind-the-casing flows includes run-in-hole a measuring system into the well, including temperature sensors, conducting a background temperature recording in the research interval, pumping a liquid contrasting in temperature and taking temperature measurements in the research interval after injection of liquid contrasting in temperature. As a temperature contrast liquid, a binary mixture (BM) is used, containing the main components in the following concentrations: ammonium salts of inorganic acids 10-15 wt.% and alkali metal nitrites 8-12 wt.%. The volume and duration of BM injection are determined taking into account previously obtained thermograms of the background temperature distribution in such a way that during the BM interaction and the reaction initiator - an inorganic acid solution, which is supplied into the well after BM injection, as a result of the exothermic reaction, the heat released is sufficient to ensure heating of the well liquid relative to the temperature of the background measurement by 5-25°C. Then the intensity of operation of individual intervals, the inflow profile in a production or injectivity in an injection well is determined by analyzing data on thermograms, including identifying areas of anomalous temperature changes in relation to the background measurement, and the presence or absence of behind-the-casing flows based on the rate of temperature change on the obtained thermograms.

EFFECT: increasing the reliability of determining the intensity of operating intervals, the inflow profile in the production well and the injectivity in the injection well, and the presence of behind-the-casing flows.

1 cl, 2 dwg