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US 9,040,136 B2Granted
Flexible pipe
AssigneeNational Oilwell Varco Denmark I/S
InventorInger-Margrete Procida
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AssigneeNational Oilwell Varco Denmark I/S
InventorInger-Margrete Procida
Estimating the term…
The invention relates to a flexible pipe comprising at least one polymer layer, and at least one armoring layer unbounded to said polymer layer, wherein at least one polymer layer is a cationic clay containing polymer layer of a polymer material comprising a polymer matrix and from about 0.1 to about 5% by weight of at least one cationic clay silicate. Preferred cationic clay silicates comprise kaolinite; smectite; Illite; chlorite; and synthetic cationic clays. The cationic clay silicate may e.g. be an organo-cationic clay. The cationic clay silicate may preferably be exfoliated and/or intercalated in the polymer matrix. The polymer layer may preferably comprise an inner liner, a thermally insulating layer, an anti-wear layer and/or an outer sheath or a sub-layer thereof.
An unbonded flexible pipe for use in offshore transportation of oil products and gas products, the flexible pipe comprising at least one polymer layer including an inner liner, and at least one armouring layer on an outer side of and unbonded to said inner liner, which is a cationic clay silicate containing polymer layer of a polymer material comprising a polymer matrix and from about 0.1 to about 4% by weight of at least one cationic clay silicate, wherein said at least one cationic clay silicate is in the form of platelets having a thickness of about 10 nm or less.
An unbonded flexible pipe as claimed in any one of the preceding claims wherein said at least one cationic clay silicate is intercalated in the polymer matrix.
An unbonded flexible pipe for use in offshore transportation of oil products and gas products, the flexible pipe comprising at least one polymer layer, and at least one armouring layer unbonded to said polymer layer, said flexible pipe comprises an inner liner which is a cationic clay silicate containing polymer layer of a polymer material comprising a polymer matrix and from about 0.1 to about 4% by weight of at least one cationic clay silicate, said inner liner providing the innermost barrier to a fluid to be transported in the pipe, wherein said at least one cationic clay silicate is in the form of platelets having a thickness of about 10 nm or less.
Dependencies are inferred from the claim text.