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.
Claims12
A down-hole oil pipe comprising a rigid pipe and a lining exposed to oil, said lining comprising a primer layer adhered to the interior surface of the pipe, and an overcoat disposed on top of said primer layer, wherein said overcoat comprises multiple layers including a lower layer and an upper layer, where said upper layer has an exterior anti-stick surface exposed to the oil and consists essentially of baked perfluoropolymer, said lining thereby reducing the deposition of asphaltenes, paraffin wax, and inorganic scale as compared to the interior surface of said oil pipe without said lining being present, so as to avoid pluggage of said rigid pipe, wherein said overcoat is applied as a liquid based composition.
Process for using a lined pipe in a down-hole oil well to convey oil from underground deposits and reduce deposition of asphaltenes, paraffin wax, and inorganic scales on said oil pipe wherein said lined oil pipe comprises a rigid pipe and a lining exposed to oil, said lining comprising a primer layer adhered to the interior surface of the pipe, and an overcoat disposed on top of said primer layer, wherein said overcoat comprises multiple layers including a lower layer and an upper layer, where said upper layer has an exterior anti-stick surface exposed to the oil and consists essentially of baked perfluoropolymer said anti-stick surface reducing the deposition in said oil well pipe of at least one of asphaltenes, paraffin wax, and inorganic scales as compared to the interior surface of said oil pipe without said lining being present, so as to avoid pluggage of said rigid pipe, wherein said overcoat is applied as a liquid composition.
Process of reducing the deposition of asphaltenes, paraffin wax, and inorganic scale in an oil well pipe used to convey oil from underground deposits by providing a rigid pipe having a lining exposed to oil, said lining comprising a primer layer adhered to the interior surface of the pipe, and an overcoat disposed on top of said primer layer, wherein the overcoat comprises multiple layers including a lower layer and an upper layer, where said upper layer has an exterior anti-stick surface exposed to the oil and consists essentially of baked perfluoropolymer, said anti-stick surface reducing the deposition in said oil well pipe of asphaltenes, paraffin wax, and inorganic scales as compared to the interior surface of said oil pipe without said lining being present, so as to avoid pluggage of said rigid pipe, wherein said overcoat is applied as a liquid composition.
Dependencies are inferred from the claim text.