Joints for high-alloy oil-well tubing with resistance to...

E - Fixed Constructions – 21 – B

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117/162, 285/63

E21B 17/042 (2006.01) F16B 33/00 (2006.01) F16B 33/06 (2006.01) F16L 58/18 (2006.01)

Patent

CA 1311779

ABSTRACT OF THE DISCLOSURE A threaded joint having high crevice-corrosion resistance for oil-well tubing of high-alloy containing not less than 7.5% by weight of Cr, has those parts, including the sealing surface, of the joint that are directly exposed to a corroding environment covered with a coating of non-metallic substance 1 to 100 µm in thickness. The coating consists of a single layer or multiple layers of oxide, nitride or carbide ceramics.

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