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US7347258: Coated tools for use in oil well pipes

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Filing Information

Inventor(s) Laurence Waino McKeen ·
Assignee(s) E.I. du Pont de Nemours and Company ·
Primary Examiner Kenneth Thompson ·
Application Number US11286599
Filing date 11/23/2005
Issue date 03/25/2008
Prior Publication Data
Predicted expiration date 04/01/2026
Patent term adjustment 129
U.S. Classifications 166/242.1  · 428/369.1  · 166/902  ·
International Classifications E21B1700  ·
Kind CodeB2
Related U.S. Application DataCROSS-REFERENCE TO RELATED APPLICATION
This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Ser. No. 60/630,779, filed Nov. 24, 2004.
7 Claims, No Drawings


Abstract

The present invention relates to a tool for use in an oil pipe having a fluoropolymer coating imparting substantially reduced adhesion of asphaltenes, paraffin wax, and inorganic scale, so as to reduce plugging of said tool, and impermeability to salt water so as to protect the tool pipe from corrosion. Such a tool is particularly useful in a pipe coated in a similar manner.

Independent Claims | See all claims (7)

  1. 1. A tool for use in an oil pipe comprising a multi-layer coating including a primer layer adhered to its exterior surface and a overcoat adhered to said primer layer, wherein the coating comprises a barrier layer formed between the primer layer and the overcoat, and the barrier layer includes a plurality of particles which form a mechanical barrier against permeation of water, gas and solvents to the tool.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3087827 DU PONT Klenke, Jr. et al. Apr 1963
US3087828 DU PONT Linton Apr 1963
US3087829 DU PONT Linton Apr 1963
US3779793* Hughes et al. Dec 1973
US3925582* TEXACO INC Sample et al. Dec 1975
US4380618 E. I. Du Pont de Nemours and Company Khan et al. Apr 1983
US4743658 E. I. Du Pont de Nemours and Company Imbalzano et al. May 1988
US4823456 Gray Apr 1989
US5932673 E. I. du Pont de Nemours and Company Aten et al. Aug 1999
US5972494 E. I. du Pont de Nemours and Company Janssens Oct 1999
US6159547 Sermatech International, Inc. McMordie et al. Dec 2000
US6232372 E. I. du Pont de Nemours and Company Brothers et al. May 2001
US6518349 E. I. du Pont de Nemours and Company Felix et al. Feb 2003
US6773815* Atofina Amouroux Aug 2004
US20040138367* Lahijani Jul 2004
US20050016610* Lahijani Jan 2005
US20060127622* MOHAN PIDATALA K Mohan et al. Jun 2006
US20060137757* MCKEEN LAURENCE W McKeen et al. Jun 2006

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
WO199953170Oct 1999
* cited by examiner

Referenced By

Document NumberAssigneeInventorsIssue/Pub Date
US7871684 E. I. du Pont de Nemours and Company Laurence Waino McKeen Jan 2011
US8383199 --