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Coated pipes for conveying oil

A technology of oil pipelines and oil pipelines, which is applied in the field of oil pipelines, and can solve problems such as corrosion and blockage without explanation

Inactive Publication Date: 2007-01-10
THE CHEMOURS CO FC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although proposals have been made to line flexible hose-type pipelines to withstand high temperatures in subsea applications, such as Dixon-Roche US Patent No. 6,505,649, this patent does not address the use of particularly hard steel pipes in oil pipelines The various problems of corrosion and clogging that are often found in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-F

[0088] Implementation of 1-FEP primer / modified PFA coating

[0089] The bottom layer 1 (liquid FEP) was applied to the prepared stainless steel sleeve and the prepared carbon steel plate, followed by baking at 150° C. for 10 minutes. The dry film thickness (DFT) of the bottom layer is 12-19 microns. Coat 1 (PFA modified with PEVE powder) was applied to the dry bottom layer. Bake it at 399°C for 20 minutes. The overall DFT is 60-75 microns. Apply a 2nd coat of coat 1. Bake it at 371°C for 20 minutes. The total DFT is 100-125 microns and the total coating thickness is 81-113 microns. When the coated sleeve was subjected to the paraffin deposition test, a deposition of only 0.0168 g / cm was obtained 2 . When a coated carbon steel panel is subjected to the PWA test and the cross-scratch adhesion test, the panel passes both tests.

example 2-F

[0090] Example 2 - FEP Primer / Fluorinated PFA Coating

[0091] Base layer 1 (liquid FEP) was applied to the prepared stainless steel sleeve and prepared carbon steel plate, followed by baking at 150°C for 10 minutes. The dry film thickness (DFT) of the bottom layer is 12-19 microns. Coat 2 (fluorinated PFA powder) was applied over the dry bottom layer. Bake it at 399°C for 20 minutes. The overall DFT is 60-75 microns. Apply a 2nd coat of coat 2. Bake it at 371°C for 20 minutes. The total DFT is 100-125 microns and the total thickness of the coating is 81-113 microns. When the coated sleeve was tested for paraffin deposition, a deposition of only 0.0145 g / cm was obtained 2 . When a coated carbon steel panel is subjected to the PWA test and the cross-scratch adhesion test, the panel passes both tests.

example 3-F

[0092] Example 3 - FEP Primer / PFA Coat

[0093] Base layer 1 (liquid FEP) was applied to the prepared stainless steel sleeve and prepared carbon steel plate, followed by baking at 150°C for 10 minutes. The dry film thickness (DFT) of the bottom layer is 12-19 microns. Coat 3 (PFA liquid) was applied over the dry base layer. Bake it at 399°C for 20 minutes. The overall DFT is 60-75 microns. Apply a 2nd coat of coat 3. Bake it at 371°C for 20 minutes. The total DFT is 100-125 microns and the total thickness of the coating is 81-113 microns When the coated sleeve is subjected to the paraffin deposition test, the deposition obtained is only 0.0124 g / cm 2 . When a coated carbon steel panel is subjected to the PWA test and the cross-scratch adhesion test, the panel passes both tests.

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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.

Description

[0001] This application claims priority to provisional application Serial No. 60 / 530296, filed December 17,2003. technical field [0002] This invention relates to oil pipelines, such as oil well pipes and oil pipelines, and more particularly to the coating of the inner surfaces of such pipes. Background technique [0003] Tubing used to transport large quantities of oil has two main uses, as well tubing for transporting crude oil from subterranean formations to the surface and as pipelines for transporting oil over long distances across the surface. Such tubes are large and long, typically having an inside diameter of at least 2 inches (5.08 cm) and at least 10 feet (3 m) in length, more often at least 20 feet (6.1 m) and most often at least 30 feet in length. Such pipes are generally made of carbon steel for economical reasons rather than expensive specialty metal alloys which are better able to withstand the corrosive entities in crude oil. Corrosion is particularly seve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L57/06F16L58/10C09D171/00F16L9/12F16L9/14
CPCF16L58/1009F16L58/1027F16L9/121Y10T428/1393
Inventor L·W·麦基恩
Owner THE CHEMOURS CO FC LLC
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