Coated pipes for conveying oil
AssigneeE. I. Du Pont de Nemours and Company
InventorLaurence Waino McKeen
Life of this patent
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Abstract
The present invention relates to an oil pipe having a lining imparting substantially reduced adhesion of asphaltenes, paraffin wax, and inorganic scale, so as to reduce plugging of said oil pipe, and impermeability to salt water so as to protect the oil pipe from corrosion.
Claims18
A down-hole oil pipe comprising a rigid pipe and a lining exposed to oil, the lining comprising a primer layer adhered to the interior surface of the pipe, and an overcoat disposed on top of the primer layer, wherein the overcoat comprises multiple layers including a lower layer and an upper layer, where the upper layer has an exterior anti-stick surface exposed to the oil and comprises a copolymer of tetrafluoroethylene with at least one perfluoro(alkyl vinyl ether), the alkyl containing from 1 to 8 carbon atoms, the lining thereby reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale as compared to the interior surface of the oil pipe without the lining being present, so as to avoid pluggage of the rigid pipe, wherein the overcoat is applied as a liquid based composition.
A down-hole oil pipe comprising a rigid pipe and a lining exposed to oil, the lining comprising a primer layer adhered to the interior surface of the pipe, and an overcoat disposed on top of the primer layer, wherein the overcoat comprises multiple layers including a lower layer and an upper layer, wherein the lower layer comprises a plurality of particles which form a mechanical barrier against permeation of water to the pipe and the upper layer has an exterior anti-stick surface exposed to the oil and comprises a copolymer of tetrafluoroethylene with at least one perfluoro(alkyl vinyl ether), the alkyl containing from 1 to 8 carbon atoms, the lining thereby reducing the deposition of asphaltenes, paraffin wax, and inorganic scale as compared to the interior surface of the oil pipe without the lining being present.
Dependencies are inferred from the claim text.