Corrosion prevention method and composition

Claim 1

IN THE PRODUCTION OF OIL FROM WELLS WHEREIN WELL FLUID IS WITHDRAWN FROM AN OIL WELL IN CONTACT WITH METALLIC SURFACES, THE METHOD OF REDUCING THE CORROSIVE ACTION ON SUCH METALLIC SURFACES IN CONTACT WITH SAID WELL FLUID WHICH COMPRISES INTRODUCING INTO THE WELL FLUID A HYDROCARBON-INSOLUBLE PETROLEUM SULFONIC ACID NEUTRALIZED WITH AN AMINO PROPYL TALLOW AMINE OF THE FORMULA R-NH-CH2-CH2-CH2NH2, WHERE R IS A TALLOW RADICAL CONSISTING OF FATTY ACIDS 16 18 CARBON ATOMS IN LENGTH, CORROSION INHIBITOR AND A GERMICIDE EFFECTIVE AGAINST SULFATE-REDUCING BACTERIA SELECTED FROM THE GROUP CONSISTING OF 1-(2-HYDROXYETHYL)-1BENZYL-2-TRIDECYL IMIDAZOLINIUM NITRITE, TETRACHLOROPHENOL, ORTHOERESOL, BORIC ACID, 1-METHYL-3-HYDROXY-4-ISOPROPYL-BENZENE, A SODIUM PARA-TOLUENE SULFONCHLORAMIDE, IODINE, COPPER CITRATE AND MALACHITE GREEN; SAID INHIBITOR BEING EMPLOYED IN A PROPORTION OF ABOUT 1 PART TO ABOUT 0.1 TO 10 PARTS OF GERMICIDE.