Claims
- 1. A method for preventing corrosion of the metallic surfaces of a horizontal pipeline in contact with an oil-in-brine emulsion of a crude oil being transported under turbulent flow conditions which produce friction comprising continuously adding to the oil-in brine emulsion flowing through the pipeline
- A. an effective turbulence-reducing amount of a water-soluble polymer having an average molecular weight greater than one million and
- B. an effective corrosion-inhibiting amount of a nitrogen-containing corrosion inhibitor selected from the group consisting of:
- quaternary ammonium salts of the following structure: ##STR5## where R, R.sub.1, R.sub.2 and R.sub.3 are moieties containing one to twenty-two carbon atoms selected from the group consisting of alkyl, aryl and alkylaryl groups and X is an anion selected from the group consisting of chlorine, bromine and iodine;
- alkyl-substituted nitrogen-containing heterocyclics of the following structure: ##STR6## where R is an alkyl moiety containing one to twenty-two carbon atoms and R.sub.1 is a moiety containing one to twenty-two carbon atoms selected from the group consisting of alkyl and alkylaryl and X is an anion selected from the group consisting of chlorine, bromine and iodine;
- amides of the following structure: ##STR7## wherein R is a moiety containing eight to twenty carbon atoms selected from the group consisting of saturated and unsaturated alkyls and R.sub.1 is an alkyl polyamine carboxylic acid salt moiety having one to twenty carbon atoms;
- and imidazolines of the following structure: ##STR8## wherein R is a moiety selected from the group consisting of benzyl, methyl and carboxylic acid salts, R.sub.1 is an alkyl moiety containing one to twenty-two carbon atoms and R.sub.2 is selected from the group consisting of alkyl polyamines having one to twenty-two carbon atoms, hydrogen and alcohols having one to twenty carbon atoms and X is an anion selected from the group consisting of chlorine, bromine, iodine and methyl sulfate.
- 2. The method of claim 1 wherein the water-soluble polymer is selected from the group consisting of polyacrylamide and co-polymers of acrylamide and acrylic acid having from 5-95 % by weight acrylamide, said polymer having an average molecular weight greater than five million.
- 3. The method of claim 2 wherein from 25 to 2500 ppm of the polymer is added to the oil-in brine-emulsion.
- 4. The method of claim 2 wherein from 50-1000 ppm of the polymer is added to the oil-in-brine emulsion.
- 5. The method of claim 2 wherein from 100-300 ppm of the water soluble polymer is added to the oil-in-brine emulsion.
Parent Case Info
This invention is a continuation-in-part of U.S. patent application Ser. No. 08/411,185 entitled "Enhanced Corrosion Protection By Use of Friction Reducers" filed on Mar. 27, 1995, now abandoned, the disclosure of which is hereby incorporated by reference.
US Referenced Citations (36)
Foreign Referenced Citations (4)
Number |
Date |
Country |
552035 |
Jan 1958 |
CAX |
628235 |
Sep 1961 |
CAX |
526 251 A1 |
Dec 1993 |
EPX |
2846977 |
May 1979 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Corrosion Study in Dynamic High Velocity Flow Application Based on New Flow Loop Data, Paper No. 117, NACE, Corrosion 93, Shi-Liang Fu/J. Byron Strickland pp. 1-16. (1993). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
411185 |
Mar 1995 |
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