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US7871684: Coated pipes for conveying oil

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Filing Information

Inventor(s) Laurence Waino McKeen ·
Assignee(s) E. I. du Pont de Nemours and Company ·
Primary Examiner Rena L Dye ·
Assistant Examiner Michele Jacobson ·
Application Number US12500140
Filing date 07/09/2009
Issue date 01/18/2011
Prior Publication Data
Predicted expiration date 12/16/2024
U.S. Classifications 428/369  · 138/DIG.3  · 138/145  · 138/146  · 138/141  · 138/140  · 138/DIG.6  · 285/45  · 285/55  · 428/369.1  ·
International Classifications F16L900  · F16L902  · F16L9147  ·
Kind CodeB2
4 Claims, No Drawings


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.

Independent Claims | See all claims (4)

  1. 1. A pipe used in the production or transportation of oil comprising a metal 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 paraffin wax, as compared to the interior surface of said pipe without said lining being present, so as to avoid pluggage of said pipe, wherein said overcoat is applied as a liquid based composition.

References Cited

U.S. Patent Documents

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Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
CA1241262DU PONT CANADAMar 1988
EP0190092MANNESMANN AktiengesellschaftMar 1989
EP0226668E.I. DU PONT DE NEMOURS AND COMPANYJan 1992
JP550733741Jun 1980
JP11227046OSAKA GAS CO LTDAug 1999
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WO199932820Jul 1999
* cited by examiner

Other Publications

RD263060, “Lining of Pipe”, Author: Anonymous, Research Disclosure, Mar. 1986, 263.
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JRV Supplement, Fall 1997, vol. 15, No. 3.
Impreglon—SR Metal Projection LTD: Online Newsletters, www.impreglon.com.
“Environmentally Friendly Fluoropolymer Coatings for Oil Field Applications”, NACE Corrosion 2003 (Paper 03146), by Brian Willis, www.nac.org.
Pradip R. Khaladkar, “Fluoropolymers for Chemical Handling Applications”, “Modern Fluoropolymers”, Edited by John Scheirs, John Wiley & Sons LTD, 1997.
“Husky Oil, Inter-Office Memorandum Re: Coating Evaluation Test Tool Results”, Sep. 1993.
Appendix A, Case Study: Rainbow Lake—Successful Coated Tubing Test and Application, Undated.
Appendix B, Technical Paper, Experimental and Theoretical Studies of Solids Precipitation From Reservoir Fluid, by F. B. Thomas, D. B. Benion, D. W. Bennion and B. E. Hunter, “The Journal of Canadian Petroleum Technology”, Jan. 1992, vol. 31, No. 1.
J. J. C. Hsu, Deepstar CTR 3205-3 Coating Study, “Effect of Coatings on Wax Deposition Under Turbulent Flow Conditions”, Report 97-0146D, Aug. 1997.
Publication of 7th International Conference on Petroleum Phase Behavior and Fouling, Asheville, North Carolina, Jun. 25-29, 2006.

Referenced By

Document NumberAssigneeInventorsIssue/Pub Date
US8171638 Lexmark International, Inc. Donal Thomas Kral et al. May 2012

Patent Family

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