METHOD OF DETERMINING INTERVAL INFLOW OF FLUID IN PRODUCTION WELLS Russian patent published in 2020 - IPC E21B47/103 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry, in particular to operation of horizontal and directional wells, and can be used for determination of injectivity profile of injection wells. Method includes use of fluid temperature sources of change of fluid temperature and sensors of measurement of change of this temperature, by which characteristics of inflow of formation fluid are determined. At that, before the beginning of the measurement, the well is stopped, after which the fluid temperature is changed by creating a heat mark with the help of a heater in the form of a heating cable winding located on axisymmetric mandrels in working zones, and distributed temperature sensor in form of optical fiber, located on axisymmetric mandrels between rings of heating cable or rings located after heating cable, and then, after a time interval sufficient for the appearance of heat marks in the given working zone, the well is started, after which the rate of movement of the created heat marks is measured in the well shaft in a certain working area, and in terms of speed of said marks and well known well diameter, flow rate is determined in different working zones of fluid inflow, and for flow rate of well, result is obtained, obtained in the nearest working zone with maximum flow rate before well head.

EFFECT: technical result consists in expansion of arsenal of facilities for determination of flow rate.

6 cl, 3 dwg