Electrode Heater on a Cable for Restoring the Flow Cross-Section of Tubing in Wells

Author details
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Bugulma, Russian Federation
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Bugulma, Russian Federation

Abstract

As part of the study, a new method for restoring the throughput of oil and gas well tubing was developed. This method utilizes specialized electrochemical heating equipment. This device is a 30 mm diameter downhole tool equipped with special replaceable blades and scrapers located at the bottom of the device. The tool is lowered via a geophysical cable, enabling effective heating and removal of deposits from the tubing walls, thereby increasing the tubing throughput. The device operates by transferring thermal energy from a heated electrolyte located within the tool to a lower scraper. This process effectively cleans the inner surface of the tubing of various types of contaminants and sediments. During the project, comprehensive design documentation was created, which was subsequently used to manufacture a prototype downhole tool and surface power source. Furthermore, extensive research was conducted to select the optimal electrolyte composition and concentration, as well as to determine the most suitable electrode material to ensure maximum efficiency of the cleaning process. The experiments conducted to determine the ideal parameters for achieving the best results in cleaning the internal surfaces of tubing are described in detail. A schematic of the surface-based adjustable power source, ensuring stable operation of the downhole tool, and a detailed design of the lower section of the device are also presented. The obtained scientific results are reflected in patent No. 2821484, confirming the uniqueness of the proposed technical solutions and their high practical value. Thus, the developed method and equipment significantly improve the operating efficiency of oil and gas wells by improving the throughput of the tubing, which helps reduce maintenance costs and increase hydrocarbon production productivity.

Keywords

electrochemical heatingdewaxingoptimization of tubing flowdeposit removalincreased production efficiency

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Article information

Published
21 November 2025
Issue date
21 November 2025
Issue
Vol. 25, No. 4 (2025)
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