Corrosion inhibitors
AssigneeExxon Chemical Patents Inc.
InventorsPaul J. Clewlow, John A. Haselgrave, Niall Carruthers, Terence M. O'Brien
Life of this patent
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Abstract
Amine derivatives which are compounds of the formula (I): ##STR1## in which R is a C.sub.6-20 hydrocarbon; Y is --CO--NH-- and n is an integer of 1 to 6; or ##STR2## in which X is an alkylene group of 2 to 6 carbon atoms and n is an integer of 0 to 6; each R.sub.1 is independently H, --(CH.sub.2).sub.1-4 COOH, a C.sub.6-20 hydrocarbon or C.sub.6-20 hydrocarbon-carbonyl; R.sub.2 is H, (CH.sub.2).sub.1-4 COOH or C.sub.6-20 hydrocarboncarbonyl; the compound containing at least one (CH.sub.2).sub.1-4 COOH group; or a salt thereof are useful in inhibiting corrosion of metals in oil- and gas-field applications, and also show low toxicity to marine organisms.
Claims13
A method of inhibiting corrosion of a ferrous metal by a fluid encountered in petroleum operations, which comprises:
- (a) introducing into the fluid inhibiting amounts of an amine corrosion inhibitor comprising a compound having the formula of ##STR10## in which n is an integer of 1 to 6;
- R is a C.sub.6-20 hydrocarbon group;
- R.sub.1 is selected from the group consisting of (i) (CH.sub.2).sub.1-4 COOH, (ii) a C.sub.6-20 hydrocarbon group, and (iii) a C.sub.6-20 hydrocarbon-carbonyl group having the formula of ##STR11## where R.sub.3 is a C.sub.5-19 hydrocarbon group;
- R.sub.2 is selected from the group consisting of (CH.sub.2).sub.1-4 COOH, and C.sub.6-20 hydrocarbon carbonyl group having the formula of ##STR12## where R.sub.3 is a C.sub.5 -C.sub.19 hydrocarbon group;
- and Y is selected from the group consisting of ##STR13## in which X is an alkylene group of 2 to 6 carbon atoms, the compound containing at least one (CH.sub.2).sub.1-4 COOH or a salt of an alkali metal, an alkaline earth metal or ammonium thereof;
- and
- (b) contacting metal with the fluid containing the corrosion inhibitor.
A method of inhibiting corrosion of ferrous metal by oil field fluids which comprises:
- (a) introducing into the fluids inhibiting amounts of an amine corrosion inhibitor ranging from 1 to 1000 ppm, the corrosion inhibitor being substantially free of primary or secondary nitrogen and having the following formula:
- ##STR18## in which n is 1 to 6;
- R is a C.sub.6-20 hydrocarbon group;
- Y is selected from the group consisting of ##STR19## in which X is an alkylene group of 2 to 6 carbon atoms;
- R.sub.1 is selected from the group consisting of (CH.sub.2).sub.1-4 COOH,
- a C.sub.6-20 hydrocarbon group, and a C.sub.6-20 hydrocarbon carbonyl group having the formula of ##STR20## where R.sub.3 is a C.sub.5 -C.sub.19 hydrocarbon;
- R.sub.2 is selected from the group consisting of (CH.sub.2).sub.1-4 COOOH and a C.sub.6-20 hydrocarbon-carbonyl group having the formula of ##STR21## where R.sub.3 is a C.sub.5 -C.sub.19 hydrocarbon, the compound containing at least one (CH.sub.2).sub.1-4 COOH group or an alkali metal salt, or alkaline earth metal salt, or ammonium salt thereof;
- (b) contacting metal with the fluids containing the corrosion inhibitor;
- (c) separating water from produced fluids;
- and
- (d) disposing of a portion at least of the separated water into a marine or fresh water environment.
Dependencies are inferred from the claim text.