RU2038421C1 - Bactericide inhibitor of corrosion in mineralized hydrogen sulfide-containing aqueous media - Google Patents

Abstract

FIELD: metal protection from corrosion. SUBSTANCE: bactericide inhibitor of corrosion contains product of reaction of primary aliphatic amines with basic formula RNH₂, where R=H is alkyl with number of hydrocarbon atoms of C₈-C₁₈, of commercial dimethylphosphate and water taken in molar ratio of 1: (0.8-1.2): (0.8-1.2). Bactericide inhibitor of corrosion additionally has hydrocarbon solvent with the following amount of components, mas. product of reaction of primary aliphatic amines, commercial dimethylphosphate and water 10-70; the balance, hydrocarbon solvent. EFFECT: higher efficiency at low doses within a wide range of temperatures. 2 cl, 2 tbl

Description

 The invention relates to means for protecting oilfield equipment from hydrogen sulfide corrosion and can be used in the oil industry.

Known corrosion inhibitor, including salts of mono - and diphosphate esters with the number of carbon atoms from 10 to 20 and water [1]
However, such an inhibitor is effective only in neutral aqueous media at high dosages and does not have a bactericidal effect.

A known inhibitor of hydrogen sulfide corrosion, which is a sodium salt of methylendic or endic acid [2]
The disadvantages of this inhibitor are the high dosage and low protective effect.

-(CH₂)_m CH₃] ˙ HCl
Недостатком его является невысокая ингибирующая активность при высокой дозировке (свыше 100 мг/л).Closest to the proposed solution is a hydrogen sulfide corrosion inhibitor [3] comprising an alkylammonium derivative-ANP-2-aminoparaffins hydrochloride of the general formula
[CH ₃ (CH ₂ ) _m

- (CH ₂ ) _m CH ₃ ] ˙ HCl
Its disadvantage is its low inhibitory activity at a high dosage (over 100 mg / l).

 The objective of the invention is the creation of a corrosion inhibitor-bactericide in mineralized hydrogen sulfide-containing environments, effective at low dosages and technologically advanced in use.

For this, a hydrogen sulfide corrosion inhibitor, including an alkylammonium derivative, as an alkylammonium derivative contains the product of the interaction of primary aliphatic amines of the general formula RNH ₂ , where RH is alkyl with the number of carbon atoms C ₈ -C ₁₈ , technical dimethylphosphite and water taken in a molar ratio respectively 1: (0.8-1.2): (0.8-1.2).

As primary aliphatic amines (PAM), fractions of C ₈ -C ₁₈ or C ₁₀ -C ₁₃ , or C ₁₀ -C _{15 are used} .

 Technical dimethyl phosphite is produced during the production of chlorophos.

An advantageous variant of the proposed product is a corrosion inhibitor-bactericide, including an alkylammonium derivative, a product of the interaction of primary aliphatic amines of the general formula RNH ₂ , where RH-alkyl is C ₈ -C ₁₈ and additionally a hydrocarbon solvent in the following ratio of components, wt.

Product inter
primary actions
aliphatic amines
general formula RNH ₂ ,
where RH-alkyl C ₈ -C ₁₈ 10-70
Hydrocarbon solution
Repeater Else
Moreover, as a hydrocarbon solvent, it contains aromatic hydrocarbons Nefras Ar 120/200 (TU 38-101809-80) or Ar 130/150 (GOST 10214-78), or the butylbenzene fraction according to TU 38-10297-78, or the ethylbenzene fraction according to TU 6-01-1037-78, or kerosene, or their mixture with aliphatic alcohol in a ratio of 0.5: 4, or aliphatic alcohol.

 As an aliphatic alcohol, the corrosion inhibitor-bactericide contains methyl alcohol (MS) or ethyl alcohol (ES), or propyl alcohol (PS), or isopropyl alcohol (IPA), or butyl alcohol (BS), or isobutyl alcohol (IHD).

 Analysis of the known technical solutions showed that in science and technology there is no object similar in the proposed combination of features and the presence of the above properties, which allows us to conclude that the invention meets the criteria of "novelty" and "electoral level".

PRI me R 1 (proposed). To 10 g of the amine C ₈ -C ₁₈ add with stirring 4.32 g of technical dimethylphosphite and 0.7 g of water. When this occurs, the exothermic heating of the reaction mass to 40-65 ^about C. The mixture is cooled and stirring is continued until a homogeneous reaction mass.

 Examples 2-5 are carried out analogously to example 1. The composition of the product is given in table 1.

 The resulting reaction product is a thick, pale yellow liquid. Determine the protective effect of the product and bactericidal properties in hydrogen sulfide-containing mineralized aqueous media.

Assessment of the protective properties of the reagents was carried out by the gravimetric method in circulation cells in an inhibited (with the addition of a reagent) standard hydrogen sulfide-containing solution in accordance with GOST 9.506-87. A model of formation water with a density of 1.12 g / cm ³ and a hydrogen sulfide concentration of 100 mg / l was 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 determination of sulfate-reducing bacteria in oilfield media Ufa, 1975, Methodology for monitoring the microbiological contamination of oilfield waters and assessment of the protective and bactericidal action of reagents (RD 39-3-973-83, 1984).

 The studies are carried out using an accumulative culture of sulfate-reducing bacteria (SBB), isolated from oil fields in the fields of Tataria, Bashkiria and Western Siberia.

A two-day endurance culture culture culture culture plant is introduced into a series of labeled tubes with pre-boiled and cooled fresh water and the test product is added in an amount that provides the required concentration (mg / l). Samples were incubated for 24 hours at room temperature (20-22 ° ^C) and then seeded in growth medium Postgate in triplicate. After seeding, the bottles with the nutrient medium are thermostated for 15 days at 32-35 ^o C.

 Effective are those concentrations that provide 100% suppression of SSS. In this case, the culture medium remains transparent.

 The test results of the product of the interaction on the protective and bactericidal action are given in table 1.

 We give examples of the preparation of a corrosion inhibitor-bactericide in a solvent.

 PRI me R 6.

 To 10 g of the reaction product obtained according to example 3 (with a ratio of PAM: DMF: water 1: 1: 1) 90 g of methanol are added. The mixture is stirred until a homogeneous product.

 Examples 7-23 perform analogously to example 6.

 PRI me R 24.

 To 10 g of the reaction product (PVZ) according to Example 3, 90 g of a mixture are added: 30 g of Nephras Ap 120/200 and 60 g of methanol. The mixture is stirred until smooth.

 Examples 25-30 are carried out analogously to example 24.

The resultant inhibitor is a pour point of light yellow transparent liquid of -10 to -50 ° ^C. Determine its protective and bactericidal action.

 The test results are presented in table.2.

 Analysis of the data presented in tables 1 and 2 shows that the proposed corrosion inhibitor-bactericide is more effective compared to the prototype ANP-2 at significantly lower dosages. In addition, the proposed inhibitor is technologically advanced for a wide temperature range and is stable during use and storage.

Claims (2)

1. CORROSION INHIBITOR BACTERICIDE hydrogen sulfide in mineralized aqueous medium comprising alkylammonium derivative, wherein the derivative as alkylammonium it comprises the reaction product of primary aliphatic amines of the general formula RNH _2, wherein R H-C ₈ alkyl, C _{1 to 8} technical dimethylphosphite and water taken in a molar ratio of 1 0.8 1.2 0.8 1.2.  2. The corrosion inhibitor according to claim 1, characterized in that it further comprises a hydrocarbon solvent in the following ratio of components, wt. The reaction product of primary aliphatic amines of the general formula RNH ₂ , where R H-alkyl is C ₈ C _{1 8} , industrial dimethyl phosphate and water, taken in a molar ratio of 1 0.8 1.2; 0.8 1.2 10 70
Hydrocarbon solvent

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