Studies of Temperature Field in Wellbore during Induction Heating of the Casing Pipe with Behind-the-Casing Fluid Flow Channels

About the authors:

Rim A. Valiullin, Dr. Sci. (Tech.), Professor, Head of the Department of Geophysics, Bashkir State University (Ufa); valra@geotec.ru

Ramil F. Sharafutdinov, Dr. Sci. (Phys.-Math.), Professor, Department of Geophysics, Bashkir State University (Ufa); gframil@inbox.ru

Vladimir Ya. Fedotov, Senior Lecturer, Department of Geophysics, Bashkir State University (Ufa); fedotov@geotec.ru

Denis V. Kosmilin, Senior Lecturer, Department of Geophysics, Bashkir State University (Ufa); kosmylindenis@yandex.ru

Ildar V. Kanafin, Assistant, Department of Geophysics, Bashkir State University (Ufa); vradlik@gmail.com

Abstract:

This paper considers the results of experimental studies of temperature regimes’ distribution in a physical model as close as possible to the systems of a real oil well, with induction heating of the column, taking into account the behind-the-casing fluid flow. Induction on the casing pipe leads to a thermal mark in the wellbore and in the annular space. Observing the formation, movement and disintegration of the thermal mark allows determining the channels of behind-the-casing fluid flow.

In this paper the authors describe the experimental setup, temperature measuring systems with distributed temperature sensors. They have studied the influence of forced convection on the sensors’ readings locating them in different places in the well (pressed against the inner wall of the column, along the axis of the device). The advantages of the azimuthal temperature mapping are shown when measuring the temperature anomalies of the cumulative fluid motion. It is established that using an azimuthally distributed temperature probe allows determining the behind-the-casing fluid overflow “from above” when measuring above and below the inductor heating point. Optimal intervals of measurement time are determined, when the separation of behind-the-casing fluid flow channels is most effective.

References:

1. Valiullin R. A., Sharafutdinov R. F., Fedotov V. Ya., Kanafin I. V., Kosmylin D. V. 2017. “Izucheniye teplovoy konvektsii na modeli skvazhiny s induktsionnym nagrevatelem pri zakolonnom peretoke ‘sverkhu’” [Study of Thermal Convection in a Well Model with an Induction Heater with behind Casing Flow from “Up to Down”]. Vestnik Bashkirskogo universiteta, vol. 22, no 2.
2. Valiullin R. A., Sharafutdinov R. F., Ramazanov A. Sh., Fedotov V. Ya., Zakirov M. F. 2008. Metod aktivnoy termometrii dlya diagnostiki sostoyaniya skvazhin [The Method of Active Thermometry for Well Diagnosis]. Interval, no 10 (117), pp. 59-60.
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