FIELD: oil and gas production.
SUBSTANCE: method for manufacturing a tubing string involves coating formation on its internal surface. The coating represents at least one polyurethane coating layer containing ureal groups with their mass fraction in the coating makes 6 to 14%. Total coating thickness is within the range 10 to 500 microns.
EFFECT: increased service durability of the tubing string ensure by more efficient deposit protection and abrasive, hydroabrasive and corrosive wear.
9 cl, 5 dwg
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