METHOD FOR DETERMINATION OF LIQUID RATE IN MARGINAL WELLS Russian patent published in 2020 - IPC E21B47/103 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular, to operation of low-rate horizontal and directional wells. Disclosed is a method involving use of fluid temperature sources of fluid temperature change and sensors of measurement of change of temperature, from which characteristics of formation fluid inflow are determined. At the same time before the measurement, the well is stopped, after which the fluid temperature is changed by supplying working gas through the distributed narrowing devices in the working zone, and then, after a time interval sufficient for cooling of fluid in said working zone, starting well, followed by measuring the speed of the cooled mark in the wellbore in a defined working area using a distributed temperature measurement source, and by rate of cooled mark movement and known diameter of well pipe, flow rate is determined in different working zones of fluid inflow, and for production rate of well the result received in the nearest working zone with the maximum flow rate before well head is accepted.

EFFECT: invention can be used for determination of injectivity profile of injection wells.

7 cl, 2 dwg