FIELD: engines and pumps.
SUBSTANCE: set of invention relates to oil-and-gas industry. Steel tubing comprises outer thread made at its ends for interconnection with the help of couplings. Steel tubing inner surface has coating of silicate enamel with circular section of silicate enamel melt saturated with iron oxides. Above said section an intermediate circular silicate enamel layer section is arranged having gas inclusions filled with oxides of carbon and hydrogen. Besides, upper circular coating section is made with flame-polished surface of silicate enamel. Thermal factor of linear expansion of coatings of silicate enamel makes 0.6-0.97 of that of steel whereof steel tubing is made. Besides, this invention covers the design of flow string.
EFFECT: higher reliability.
2 cl
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