Corrosion inhibitor in hydrogen sulfide-containing media

FIELD: corrosion protection.

SUBSTANCE: invention provides inhibitor for protecting oil-field equipment against hydrogen sulfide, carbon dioxide, and oxygen corrosion, which comprises, in solvent, 1-10% of reaction product of monoethylated alkylphenol with phosphorus-containing compound and amine, 1-20% of nonionic surfactant, 5-40% of organic acid/amine reaction product, and 2-15% of interaction product of a mixture of primary and secondary aliphatic amines with low-grade dimethyl phosphite.

EFFECT: improved protection against corrosion, reduced preparation expenses, and extended resource of raw materials.

4 tbl, 11 ex

The invention relates to the protection of oilfield equipment in environments containing dissolved hydrogen sulfide, carbon dioxide, oxygen, and can be used in the oil industry.

Known corrosion inhibitor in aqueous media, comprising the interaction product of phosphoric acid with dimethylaminomethylphenol and water (Ed. mon. The USSR №1081278, 23 F 11/00, 1994).

The inhibitor is not effective enough in hydrogen sulfide and carbon dioxide environments, and also has a high freezing point.

Known corrosion inhibitor comprising the interaction product of polyoxyethylene monoalkylphenol with phosphorus-containing compound by heating with subsequent interaction with the amine (Patent RF №2113543, ÁL 23 F 11/126). Known inhibitors are not effective in mixed environments.

Known closest to the technical essence and the achieved effect of corrosion inhibitor in saline hydrogen sulfide-containing aqueous media in the presence of carbon dioxide, comprising the interaction product of polyoxyethylene monoalkylphenol with phosphorus-containing compound and the amine in the solvent, the product of the interaction of organic acids with the amine in the solvent and a nonionic surfactant (Patent RF №2162116, ÁL 23 F 11/14, 2000).

Known inhibitor insufficient EF the objective in saline environments containing a mixture of H₂S and CO₂.

The present invention is the task of creating a corrosion inhibitor for environments containing H₂S, CO₂and O₂with high effect protection against carbon dioxide and hydrogen sulfide corrosion and cheap and available raw materials base.

Delivered to the invention the task is solved in that the corrosion inhibitor for hydrogen sulfide mineralized environments, including the product of the interaction of polyoxyethylene monoalkylphenol with phosphorus-containing compound and an amine, nonionic surfactant, a product of the interaction of organic acids with an amine, optionally, contains the product of the interaction of a mixture of primary and secondary aliphatic amines with technical dimethylphosphite and the solvent in the following ratio, wt.%:

The product of the interaction of ethoxylated

monoalkylphenol with phosphorus-containing compound and 1-10

Amin

Nonionic surfactant 1-20

The product of the interaction of organic acids with the amine 5-40

The product of the interaction of a mixture of primary 2-15

and secondary aliphatic amines with technical dimethylphosphite

The solvent else

The product of the interaction PV1 mixture of primary and secondary aliphatic amines with technical DIMET what lhospital mixed at a temperature of 50° With that then within 3-4 hours the mixture is heated to 60-70C°. Get a thick mass of light yellow to brown.

As the aliphatic amines can be used, for example, amines fraction C₈-C₁₈or C₁₀-C₁₄or C₁₀-C₁₆or C₈-C₃₀.

Example 4 for PV1.

In chetyrehosnuju flask equipped with stirrer, reflux condenser and addition funnel, is placed 92 g technical dimethylphosphite and metered with stirring 200 g of amine fraction C₈-C₁₈containing 180 g of primary and 20 g of secondary amines, keeping the reaction temperature not higher than 50°C. the mixture is Then heated to complete the process 3-4 hours at a temperature of 60-70°C.

Examples 1-3, 5, 6 (see tab. 1) is carried out analogously to example 4, by changing the ratio of initial components.

The product of the interaction PV2 obtained by serial dilution of polyoxyethylene monoalkylphenol with phosphorus-containing compound at a temperature of 100-150°With, then with the amine at a temperature of 40-70°C.

As amines are used, for example, mono-, di-and triethanolamines, and amines normal structure fraction₁₀-C₁₆.

As phosphorus-containing compounds used dimethylphosphite on THE 6-36-5763445-6-88 or monomethylether, or phosphorus trichloride.

As oksietilirovannye the CSOs alkylphenol use neonols AF _9-4,_{10, 12}with alkyl With₉or OP-4, 7, 10.

Example 1 PV-2.

To 198 g of neonols AF_9-4added 54 g of technical dimethylphosphite, the reaction mixture is heated under stirring up to 120-150°C for 3 hours. To the resulting reaction mixture is added 75 g of triethanolamine and mix to obtain a homogeneous mass.

Examples 2-11 (see table 2) is carried out analogously to example 1, changing the original components and their number.

The product of the interaction of organic acids with the amine THP receive by mixing at a temperature of 40-50°C for 2-3 hours.

As amines using ethanolamine General formula H_3-nN(C₂H₂OH)_nwhere_n=1, 2, 3; secondary amines R₁R₂NH with alkyl, R₁, R₂=CH₃With₂H₅With₂H₄HE₃H₆HE; soulkilling fraction C₁₂-C₁₈or ethoxylated fatty amine with the number of carbon atoms With₈-C₂₀.

As the organic acid, the product of the interaction includes, for example, oleic acid according to GOST 7580-91, 2-ethylhexanoyl acid on THE 2431-03-53-505-711-01 or fatty acids from natural coconut oils of fractions of C₅-C₁₆.

Example 1 PV.

To 280 g organic acids from coconut oils add of 73.5 g of monoethanolamine. Heat the reaction mixture at peremeci the years to 60-70° C for 3 hours to obtain a homogeneous mass.

Examples 2-9 (see table 3) is carried out analogously to example 1 by changing the quantitative ratio.

As the nonionic surfactant in the composition of the proposed product use neonols AF_{9-4, 6, 10}on THE other 2483-077-05766801-98, or ethoxylated ALKYLPHENOLS based polymetacrylate OP 7, 10 GOST 8433-81, or monoalkyl ether of polyethylene glycol on the basis of higher fatty alcohols - sintana ALM-10.

As the hydrocarbon solvent can be used, for example, aliphatic alcohol (methyl, ethyl, propyl, isopropyl, butyl, etc.); nefras AR 120/200 (TU 138-101809-80), AR 130/150 (GOST 10214-78), AR 150/330 (TU 38.1011049-E); ethylbenzol fraction (ABF) (TU 6-01-1037-78); butylbenzene fraction (BBF) (TU 38-10297-78); mixtures thereof in various combinations.

The inventive corrosion inhibitor is produced by sequential mixing of the components. Cooled to 20°the product of the interaction of THP enter a product of the interaction of PV1, stirred for 0.5 hours. As the mixture is injected PV2, nonionic surfactant and a solvent, the mixture is stirred for 0.5 hour to obtain a homogeneous mass. The resulting inhibitor is homogeneous brown liquid with a pour point of minus 30-50°C.

Example 1 to obtain the home is aemula product.

In chetyrehosnuju flask, equipped with reflux condenser and stirrer, was placed 400 g PV and with stirring, add 20 g of the product of the interaction of PV1, 50 g of the product of interaction PV2, 10 g of neonols AF_9-6and 520 g of methanol.

Examples 2-7 carried out analogously to example 1. Quantitative ratios are given in table 4.

The proposed inhibitor appreciate the magnitude of the protective effect at certain dosages according to GOST 9.506-87 electrochemical method. As an aggressive environment model was used for produced water with a density of 1.12 g/DM³at a concentration of: a) hydrogen sulfide 100 mg/l; b) hydrogen sulfide 100 mg/l and dissolved carbon dioxide of 400 mg/l; C) oxygen 1 mg/l hydrogen sulfide of 20 mg/l, and dissolved carbon dioxide of 200 mg/L.

The results are given in table 4. Analysis of the data presented in the tables shows that the proposed corrosion inhibitor is more effective than the prototype.

Corrosion inhibitor in saline environments containing a mixture of dissolved gases H₂S, CO₂O₂comprising the interaction product of polyoxyethylene monoalkylphenol with phosphorus-containing compound and an amine, nonionic surfactant, a product of the interaction of organic acids with an amine, characterized in that it further comprises the product of the interaction of a mixture of primary and secondary aliphatic amines with technical dimethylphosphite and the solvent in the following ratio, wt.%:

the product of the interaction of ethoxylated

monoalkylphenol with phosphorus-containing compound and

Amin 1-10

nonionic surfactant 1-20

the product of the interaction of organic acids with the amine 5-40

the product of the interaction of compounds the primary and secondary

aliphatic amines with technical dimethylphosphite 2-15

the solvent else.