Threaded pipe with surface treatment
AssigneeTenaris Connections Limited
InventorsDiego Dell'Erba, Gabriel E. Carcagno
Life of this patent
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Abstract
A threaded metallic pipe for oil extraction industry has a threaded end portion with treated surface in which the metal surface has a roughness (Ra) comprised of 2.0 μm and 6.0 μm, which is covered by a uniform layer (7) of a dry corrosion inhibiting coating and a second uniform layer (8) of dry lubricant coating. Alternatively the layers (8, 9) combined into one uniform layer (9) of a dry corrosion inhibiting coating containing a dispersion of particles of solid lubricant.
Claims15
A pipe segment (1) of definite length for oil extraction industry made of a metal, having a central portion with a substantially cylindrical wall and at least a threaded end portion (3, 4) covered with a surface protection characterised in that the metal surface in the threaded end portion (3, 4) has a surface roughness (Ra) comprised between 2.0 μm and 6.0 μm, said surface protection being constituted by a first uniform layer (7) of a dry corrosion inhibiting coating made of an epoxy resin containing particles of Zn and a second uniform layer (8) of dry lubricant coating covering said first layer (7).
A pipe segment (1, 2) of definite length for the oil or gas extraction industry made of a metal, with a central portion with a substantially cylindrical wall and a threaded end portion (3,4) covered with a surface protection, characterised in that the metal surface of the threaded end portion (3,4) has a surface roughness (Ra) comprised between 2.0 μm and 6.0 μm, and said surface protection is constituted by one uniform layer (9) made of a dry corrosion inhibiting coating containing a dispersion of particles of solid lubricant.
Dependencies are inferred from the claim text.