RU2225899C1 - Corrosion inhibitor - bactericide in hydrogen sulfide-containing media - Google Patents

Abstract

FIELD: oil and gas production. SUBSTANCE: invention relates to protection of oil-field equipment and intended for suppressing vital activity of microorganisms and inhibiting corrosion in oil production, transportation, and storage systems, and in watered oil formations, including those operated in secondary oil production. Bactericidal corrosion inhibitor contains 20-15% nonionic surfactant, 30- 50% nitrogen-containing compound, and solvent, said nitrogen-containing compound being product of reaction of tetramethyldipropylenetriamine with C8-C16-alkyl bromides at their molar ratio 1: (1-2), respectively. EFFECT: increased low-dose efficiency and ensured activity against sulfate-reducing bacteria. 1 tbl, 2 ex

Description

The invention relates to the protection of oilfield equipment, is intended to suppress the vital functions of microorganisms and inhibit corrosion in production systems, transport, storage of oil and in waterflood oil reservoirs, including secondary oil production, and can be used in the oil industry.

A known method of inhibiting the growth of sulfate-reducing bacteria by introducing N-alkyl-2-methyl-5-ethylpyridinium halides (AS USSR No. 1094853, C 02 F 1/50, 1984).

A known composition for controlling sulfate reducing bacteria based on N-alkyl isoquinolinium bromide, which additionally contains N-alkylquinolinium bromide, quinoline, 2-methyquinoline, 2,4-dimethylquinoline, 2,6-dimethylpyridine (AS USSR No. 1682326, C 02 F 1 / 50, 1989).

The closest in technical essence and the achieved effect is known composition for protecting oilfield equipment from hydrogen sulfide corrosion, including fatty acid, a nitrogen-containing component - N-alkyl-2-methyl-5-ethylpyridinium bromide, a surfactant and a solvent (RF Patent No. 2140464, C 23 F 11/14, 1999).

The problem to which this invention is directed, is the creation of an inhibitor of hydrogen sulfide corrosion, effective at low dosages and having a bactericidal effect against sulfate-reducing bacteria.

The problem is solved in that the corrosion inhibitor is a bactericide in hydrogen sulfide-containing environments, including a nonionic surfactant, a nitrogen-containing compound and a solvent, which contains a reaction product of tetramethyldipropylenetriamine with C ₈ -C ₁₆ alkyl bromides in a molar ratio of tetramethyldipropylene triole, : (1-2), respectively, and in the following ratio of components, wt.%:

The interaction product specified above 30-50

Nonionic surfactant 10-15

Solvent Else

As a nonionic surfactant, the corrosion inhibitor contains neonol AF 9-12 or AF 9-10 (alkyl phenol based on propylene trimers, ethoxylated according to TU 2483-077-0576680-98), OP-10 according to GOST 8433-81, syntanol ALM-10 - polyethylene glycol monoalkyl ether based on fatty alcohols according to TU 6-14-864-98 and others.

As an amine, to obtain the interaction product, tetramethyldipropylenetriamine (TU 301-03-85-88) with a content of the main substance of at least 95% is used:

(CH ₃ ) N (CH ₂ ) ₃ NH (CH ₂ ) ₃ N (CH ₃ ) ₂

As a solvent, the inhibitor contains a mixture of aromatic hydrocarbons Nefras Ar 120/200 according to TU 38101809-80 Ar 130/150 (GOST 10214-78), Ar 150/300 (TU 38.1011049-87Е) or ethylbenzene fraction (TU 6-01-10- 37-78) or butylbenzene fraction according to TU 38-102-97-78, toluene according to GOST 147-10-78, as well as aliphatic alcohols, for example methanol (GOST 2222-78), isopropanol (GOST 9805-84), etc.

The product of the interaction of tetramethyldipropylenetriamine (TMDT) with an alkyl bromide is obtained by heating a mixture of these components, taken in the ratio 1: 1 or 1: 2.

An analysis of the data in the search for known technical solutions showed that in science and technology there is no object similar in terms of the claimed combination of features and advantages, which allows us to conclude that the criteria of “novelty” and “inventive step” are met.

To prove the compliance of the claimed composition with the criterion of “industrial applicability” we give specific examples of the preparation of the inhibitor and its properties.

Example 1

Obtaining the product of the interaction (PV) of TMDT with decyl bromide.

A mixture of 18.7 g of TMDT and 22.1 g of decyl bromide is heated in a flask with a stirrer for 5 hours to 45-50 ° C while stirring a homogeneous product.

The reaction product is a thick viscous mass of light yellow or light brown.

Obtaining the products of the interaction of TMDT with other alkyl bromides are carried out analogously to example 1.

Example 2

Obtaining a corrosion inhibitor.

In a four-necked flask equipped with a stirrer and reflux condenser, a mixture of 50 g of methanol, 10 g of neonol AF 9-12 and 40 g of the reaction product of TMDT with decyl bromide is placed and stirred at room temperature until a homogeneous mass is obtained. The resulting inhibitor is a clear liquid of light brown color with a pour point of not higher than 40 ° C.

Other examples of the preparation of corrosion inhibitors are carried out analogously to example 2. Data on their anticorrosive and bactericidal activity are shown in table 1.

The resulting reagents are tested for anticorrosion and bactericidal activity.

Assessment of protective properties is carried out by the gravimetric method in circulation cells in an inhibited (with the addition of a reagent) standard hydrogen sulfide solution according to GOST 9.50687. A model of produced water with a density of 1.12 g / cm ³ and a hydrogen sulfide concentration of 100 mg / l is used as an aggressive medium. Test duration 6 hours

Evaluation of bactericidal activity is carried out in accordance with the methodological recommendations of VNIISPTneft: “Methodology for the control of microbiological contamination of oilfield waters and the assessment of the protective and bactericidal action of reagents”. The studies are carried out using an accumulative culture of sulfate-reducing bacteria (SBB), isolated from oil fields in the fields of Tataria, Western Siberia, Bashkiria.

The test results are presented in the table.

Analysis of the indicators presented in the table shows that the proposed corrosion inhibitor, a bactericide, is an effective reagent that is stable when used and stored in comparison with the prototype and allows the use of industrially produced tetramethyldipropylenetriamine, which leads to the expansion of the raw material base.

Claims (1)

Corrosion inhibitor - a bactericide for hydrogen sulfide-containing media, including a nitrogen-containing compound, a nonionic surfactant and a solvent, characterized in that, as a nitrogen-containing compound, it contains the product of the interaction of tetramethyldipropylene triamine with alkyl bromides (alkyl C _10-16 ) with a molar ratio of tetramethyl alkyl dipropyl, 1: (1-2), respectively, and in the following ratio of components, wt.%: The interaction product specified above 30-50 Nonionic surfactant 10-15 Solvent Else