Anti-corrosion formulations with storage stability
The present invention concerns the use of at least one compound A comprising at least one —SH or —S—, M+group, at least one —C-G-C— chain, in which G represents an atom from column 16 of the periodic table, not comprising a carboxy group —C(═O)—OH or —C(═O)—O—, and of a molar mass of between 90 g·mol-1 and 1000 g·mol-1, as an additive in a formulation inhibiting corrosion in metals used in the oil industry, and more generally in any kind of industry involving the drilling of ores or fossil compounds, such as gas or oil, in order to improve both the anti-corrosion performance and the storage stability of same. The invention also concerns said corrosion-inhibiting formulations comprising at least one compound A.
1. A corrosion-inhibiting formulation comprising:
a) at least one amine or amine derivative,
b) at least one compound A of formula Aln:
wherein n represents an integer having a value of from 2 to 10, limits included, and
c) optionally a solvent or a mixture of two or more solvents, wherein:
a) represents from 40% to 99.5% by weight, limits included, with respect to the total weight of the components a)+b)+c),
b) represents from 0.5% to 30% by weight, limits included, with respect to the total weight of the components a)+b)+c), and
c) represents from 0% to 59.5% by weight, limits included, with respect to the total weight of the components a)+b)+c).
2. The formulation as claimed in claim 1 , wherein a) is selected from the group consisting of amines, ethoxylated amines, amino acids, imidazolines, salts thereof, fatty amines, imidazolines substituted by at least one fatty chain, alkoxylated imidazolines, ester amines, ether amines, alkylamines, oxyalkylated amines, betaines and alkylbetaines, and N-oxide derivatives of the amines.
3. The formulation as claimed in claim 1 , wherein b) is selected from the group consisting of 2,2′-(ethylenedioxy)diethanethiol and 1,11-dimercapto-3,6,9-trioxaundecane.
4. The formulation as claimed in claim 1 , wherein c) is selected from the group consisting of water, organic solvents and mixtures of water with at least one organic solvent.
5. The formulation as claimed in claim 1 , further comprising one or more other inhibitors capable of inhibiting corrosion encountered in extraction of hydrocarbons or alternatively capable of inhibiting formation of hydrates or their agglomeration, avoiding or preventing appearance of scale, avoiding or preventing growth of bacteria or promoting flow.
6. The formulation as claimed in claim 1 , wherein:
a) represents from 55% to 85% by weight, limits included, with respect to the total weight of the components a)+b)+c),
b) represents from 2% to 20% by weight, limits included, with respect to the total weight of the components a)+b)+c),
c) represents from 20% to 59% by weight, limits included, with respect to the total weight of the components a)+b)+c).
7. The formulation as claimed in claim 1 , wherein the molar mass of the compound A is between 200 g·mol −1 and 1000 g·mol −1 , limits included.
8. A method of treating metal pipes corrodible in contact with corrosive media, comprising contacting a metal pipe corrodible in contact with corrosive media with an effective amount of at least one corrosion-inhibiting formulation as claimed in claim 1 .