Pipe interior coatings

Details Pipe interior coatings Pipe interior coatings

B - Operations, Transporting

05

D

B05D 7/14 (2006.01) B32B 15/08 (2006.01) F16L 58/10 (2006.01)

Patent

CA 2695493

Pipe useful for downhole and transport of hydrocarbon fuel such as oil and/or natural gas is provided that has a non-stick coating adhered to the pipe interior surface, said coating being at least about 50 µm thick and comprising at least two layers constituting an inner layer and an outer layer adhered to one another, each said layers containing polymer binder and fluoropolymer and being at least about 15 µm thick, the weight proportion of said polymer binder to said fluoropolymer in said inner layer and in said outer layer being effective to maintain adhesion between said layers during pressurization and decompression upon said non-stick coating being exposed to the Autoclave Test and the proportion of said fluoropolymer in said inner layer and said outer layer being effective to protect said interior surface during exposure of said non-stick coating to the Acid Soak Test.

L'invention concerne une conduite utile pour le forage descendant et le transport d'hydrocarbures tels que le pétrole et/ou le gaz naturel qui est dotée d'un revêtement antiadhésif collé sur la surface intérieure de la conduite. Ledit revêtement fait au moins 50 mm d'épaisseur et comprend au moins deux couches constituant une couche interne et une couche externe collées l'une à l'autre. Chacune desdites couches contient un liant polymère et un fluoropolymère et fait au moins environ 15 mm d'épaisseur, la proportion en poids dudit liant polymère par rapport audit fluoropolymère dans ladite couche interne et ladite couche externe étant efficace pour maintenir l'adhérence entre lesdites couches pendant la pressurisation et la décompression, lorsque ladite couche antiadhésive est exposée à l'essai en autoclave et la proportion dudit fluoropolymère dans ladite couche interne et ladite couche externe étant efficace pour protéger ladite surface intérieure lors de l'exposition de ladite couche antiadhésive à l'essai de trempage dans l'acide.

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