In this paper, the results of investigation of wear of well-tubing with the sea depth from 3000 to 5000 meters are presented. The theory of erosion for tubing is established basing on the flow of exploited products and the principles of erosion and corrosion, for calculating the wear of thickness of tubing and the influence of environment and exploited oil products flow (pressure, velocity, temperature etc.). The long-life of tubing is determined for the maintenance service. Various proposals for increasing effectiveness of tubing exploitation are presented as materials changing, manufacturing, improving etc.

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