Application of the active temperature logging method for diagnostics of well condition and environmental subsurface monitoring

UDK: 550.832.6

DOI: 10.24887/0028-2448-2026-4-24-28

Key words: active temperature logging, induction heating, behind-the-casing flow, temperature anomaly, column heating

Authors: R.A. Valiullin (Ufa University of Science and Technology, RF, Ufa); R.F. Sharafutdinov (Ufa University of Science and Technology, RF, Ufa); V.Ya. Fedotov (GeoTEK NPF, RF, Ufa); A.Sh. Ramazanov (Ufa University of Science and Technology, RF, Ufa); A.I. Imaev (TNG-Group LLC, RF, Bugulma); V.V. Bazhenov (TNG-Group LLC, RF, Bugulma); R.S. Mukhamadiev (TATNEFT PJSC, RF, Almetyevsk); B.F. Akhmetov (TatNIPIneft, RF, Almetyevsk)

The paper considers active temperature logging as an efficient tool for diagnostics of well condition and environmental subsurface monitoring. This research is of current interest because most of oil and gas fields and underground gas storage facilities have a significant operation life. This leads to deterioration of wells technical conditions resulting in behind-the-casing flow and loss of casing integrity. The most insightful method for diagnosing the technical condition of wells is temperature logging; however it does not always enable the accurate detection of behind-the-casing flows. Innovative active temperature logging method that relies on induction heating of metal casing creates temperature disturbance. Its propagation and evolution are analyzed to identify behind-the-casing flows, casing leaks, and evaluate flow rates. Findings of the research conducted using advanced active temperature logging tools, including distributed temperature sensors, suggest that analysis of the speed, extent, and direction of generated temperature disturbance propagation enables not only determination of presence/ absence of behind-the-casing flows, but also identification of crossflow channels, flow rate, and reservoir injectivity, particularly for multilayer formations. The data obtained confirm that active temperature logging outperforms conventional diagnostic methods in terms of information content, which is important for development of oil and gas fields and protection of freshwater intervals.

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