Purpose. The aim is to increase the efficiency of insulation workings by using thermoplastic blends based on polyethyleneterephthalate. Methodology. The tasks were solved by a multimeter method including the analysis and synthesis of the literary and patent sources, the analytical and experimental studies. Data interpretation was carried out using the methods of mathematical statistics. Findings. Isolation method of swallowing horizons with thermoplastic materials was developed and validated. To realize it, the following production operations should be done: delivery of the thermoplastic materials to the downhole, the melting of thermoplastic materials and squeezing thermoplastic materials in absorption channels. The use the polyethyleneterephthalate-based domestic household waste was proposed as the plugging material to isolate the swallowing horizons of boreholes. Originality. The possibility of using the domestic household waste based on polyethyleneterephthalate as the plugging thermoplastic material was proved and validated for the first time. Also for the first time, there was analytically proved the method of determining the efficient range of application of the isolation technology for swallowing and unstable horizons by thermoplastic materials using downhole heat sources. Practical value. The results of this work is the development of technology and techniques of isolation of swallowing and unstable horizons, formula of tamping thermoplastic material, technology regulations of isolation of swallowing horizons.

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