Measurement of fluid flow, especially for small values of flow rate, is important and, at the same time, a difficult task [1, 8-11]. The need for reliable measurement of this parameter is especially important for operating well logging. There are many flow measurement methods that are based on measuring the flow rate when the cross-sectional area is known. A wide-spread thermo-anemometer method was obtained in the study of producing wells. Its operation is based on the dependence of the body heat transfer on the flow velocity of its cooling fluid flow [3-5]. Thermal anemometers are used to detect inflow and uptake intervals; determination of leakage of the column under low-rate conditions, when mechanical flow-meter is ineffective. The sensors are reliable, compact, have low inertness. But with all the advantages, thermal anemometers have their own limitations:

  • Only the first inflow interval is well defined, then the sensitivity decreases sharply;

  • The change in ambient temperature can be perceived as a change in the composition or velocity of the fluid, which reduces the efficiency of determining the radial flow;

  • The instrument's readings are strongly influenced by the axial flow of the liquid

In this regard, the development of more effective thermal anemometer sensor remains an urgent task.

In this case, the development of an azimuthally-distributed thermal anemometer of indirect heating is one of the possible ways [6,7].

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