Pipe preformed liner comprising metal powder

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 63/00 (2006.01) F16L 58/10 (2006.01)

Patent

CA 2628919

The present invention relates to a preformed liner of tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer adhered to the surface of a pipe, and in particular, an oil well pipe, without the need for either a primer layer or an adhesive. The liner comprises an effective amount of metal powder which provides adhesion between the liner and the surface of the pipe. The present invention also relates to a process for making such pipe, where in a preferred embodiment, the liner is co-extruded to form an inner layer and an outer layer. This co-extrusion embodiment is particularly useful in applications where high purity is necessary. In this case, the inner layer comprises an effective amount of metal powder and the outer layer is pure tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.

La présente invention concerne un revêtement préforme de copolymère tétrafluoroéthylène/perfluoro(alkylvinyléther) collé sur la surface d~un tuyau, et en particulier d~un tuyau de puits de pétrole, sans avoir besoin d~utiliser de couche d~apprêt ou d~adhésif. Le revêtement comprend une quantité efficace de poudre métallique qui procure une adhésion entre le revêtement et la surface du tuyau. La présente invention concerne également un procédé pour la réalisation d~un tel tuyau, où dans un mode de réalisation préféré, le revêtement est co-extrudé pour former une couche interne et une couche externe. Ce mode de réalisation de co-extrusion est particulièrement utile dans des applications pour lesquelles est nécessaire une grande pureté. Dans ce cas, la couche interne comprend une quantité efficace de poudre métallique et la couche extérieure comprend uniquement le copolymère tétrafluoroéthylène/perfluoro(alkylvinyléther).

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