Authors: D.V. Kosmylin, R.A. Valiullin, R.F. Sharafutdinov, R.A. Galimov

Title of the article: Study of thermal field distribution of a point heat source in the presence of radial flow

Year: 2023, Issue: 6, Pages: 4-12

Branch of knowledge: 1.6.9. Geophysics, geophysical methods of prospecting for minerals

Index UDK: 550.8.08:550.832.6

DOI: 10.26730/1999-4125-2023-6-4-12

Abstract: The article deals with the thermoanemometric method of flow measurement in a well, based on the dependence of heat transfer of a body on the velocity of fluid flow cooling it. Well thermoanemometer (WTD) helps in geophysics to solve the following problems: identification of inflow and absorption intervals; determination of leakage locations in low flow conditions. The used CTD sensors have a number of disadvantages that do not allow to solve these tasks to the full extent, and are more often used as a thermal indicator. The disadvantages are: only the first inflow interval is sampled, further the accuracy of the method decreases; it is not possible to determine the direction of lateral flow; the influence of axial flow and fluid composition on the readings. In this connection, the paper presents the evolution of the classical borehole thermal inflow indicator (TI) of indirect heating, namely, azimuthally distributed thermoanemometer, to solve the problem of flow direction estimation and flow rate estimation. The essence is to utilize two pairs of thermo-sensitive elements located on diametrically-opposite sides of the sensor cross-section. In this case, the thermosensitive elements are connected according to the differential circuit, therefore, we measure the temperature not at a point, but the temperature difference between two points. Heating of the thermoanemometer is carried out with the help of induction heater. Due to the use of induction heater we achieve uniform heating of the body of azimuthally distributed thermoanemometer. Due to the developed design the sensor is able to determine the presence of liquid flow perpendicular to the body, as well as to determine its direction. This is confirmed by a series of experimental works on a rotary bench.

Key words: Induction heating lateral flux azimuthally distributed temperature

Receiving date: 21.11.2023

Approval date: 10.12.2023

Publication date: 21.12.2023

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