RU2061091C1 - Corrosion inhibitor in media containing hydrogen sulphide - Google Patents

Abstract

FIELD: oil industry. SUBSTANCE: invention deals with protection of oil producing equipment against hydrogen sulphide corrosion. Corrosion inhibitor includes interaction product: one mole of fatty acid with number of carbon atoms C₁₀-C₂₀ and (0.1-1.0) mole of aminoparaffin with number of atoms C₈-C₂₀, surface-active substance and solvent. EFFECT: enhanced protective efficiency. 1 tbl

Description

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

A known corrosion inhibitor comprising a mixture of salts of mono- and diphosphate esters of primary and secondary alcohols with the number of carbon atoms C ₁₀ -C ₂₀ and water (ed. St. N 797266, class C 23 F 11/08, 1992). However, the known inhibitor is effective only in neutral aqueous media at high dosages.

 A known inhibitor of hydrogen sulfide corrosion, which is sodium sily methylendic or endic acid [1] The disadvantage of this inhibitor is the high dosage and low protective effect.

(CH₂)_nCH₃] •HCl (АНП-2) (авт. св. N 652315, кл. Е 21 В 43/00, 1979).Closest to the proposed is a corrosion inhibitor in hydrogen sulfide-containing environments, including aminoparaffins hydrochloride, a mixture of compounds of the general formula:
[CH ₃ (CH ₂ ) _m -

(CH ₂ ) _n CH ₃ ] • HCl (ANP-2) (ed. St. N 652315, CL E 21 B 43/00, 1979).

 A disadvantage of the known inhibitor is the low protective effect at a high dosage of over 100 mg / L.

 The purpose of the invention is the creation of a corrosion inhibitor in hydrogen sulfide-containing environments with a high protective effect at a low dosage and technologically advanced in use.

The goal is achieved in that the corrosion inhibitor in hydrogen sulfide-containing environments, including the derivative of aminoparaffins, as the derivative of aminoparaffins contains the reaction product of 1 mol of fatty acid with the number of carbon atoms C ₁₀ -C ₂₀ and (0.1-1) mol of aminoparaffin with the number of carbon atoms C ₈ -C ₂₀ and additionally non-ionic surfactant and solvent in the following ratio of components, wt.

Product Interaction
Action 1 mole oily
acids with a number
carbon atoms
C ₁₀ -C ₂₀ and (0.1-1) mol
aminoparaffin with chis-
carbon atom scrap
C ₈ -C ₂₀ 10-50
Nonionic surface
nostroactive substance 10-30
Solvent Else
Fatty acids used are tallow fatty acids with the number of carbon atoms C ₁₈ according to GOST 14845-75 or synthetic fatty acids of the fractions C ₁₀ -C ₁₃ , C ₁₀ -C ₁₆ , C ₁₇ -C ₂₀ according to GOST 23239-89 or oleic acid according to GOST 7580-91.

Aminoparaffins with the number of carbon atoms C ₈ -C ₂₀ are fractions of primary amines C ₈ -C ₁₈ , C ₁₀ -C ₁₂ , C ₁₂ -C ₁₅ , C ₁₀ -C ₁₆ , C ₁₂ -C ₁₈ , C ₁₇ -C ₂₀ normal or iso-structure.

As a nonionic surfactant, monoalkylphenol based on α-olefins, ethoxylated neonol α-12 or α-14 according to TU 2483-004-05766801-93 or monoalkylphenol based on propylene trimers, ethoxylated neonol AF _9-12 , or AF ₉ can be used _-10 according to TU 38.507.63.171-91, or OP-10 according to GOST 8433-81, or polyethylene glycol monoalkyl ether based on higher fatty alcohols of the general formula:
With _n H _{2n + 1} O (C ₂ H ₄ O) _m H, where n 10-18, m8-10 syntanol ALM-10 (according to TU 6-14-864-88).

 As a solvent, the corrosion inhibitor contains aliphatic alcohol methyl or ethyl, or isopropyl (IPA), or butyl (BS), or isobutyl (IHD), or aromatic hydrocarbons, ethylbenzene fraction (EBP) (TU 38.30225-81), or Nefras Ap 120 / 200 (TU 38.101809-80), or an aromatic solvent Ar (according to TU 38.102144-90), or an oil solvent (GOST 10214-78), or butylbenzene fraction (BBF) according to TU 38.10297-78, or mixtures thereof.

The proposed corrosion inhibitor is obtained by simple mixing of the starting components in the indicated proportions. Thus there is a self-heating of the reaction mixture at 5-10 ^{° C,} indicating that passage of the reaction of amines and fatty acids to form salts. Those. upon receipt of the proposed composition, the mixture is heated due to the formation of the product of the interaction of fatty acids and aminoparaffins.

 PRI me R 1 prototype (ANP-2).

 PRI me R 2 (proposed).

80 g of methyl alcohol are added to 5 g of fatty acids of the C ₁₀ -C ₁₃ fraction (1 mol) and 5 g (0.25 mol) of the primary amines of the C ₁₀ -C ₁₆ fraction are added with stirring. Self-heating of the reaction mass occurs with the formation of an interaction product. Then, 10 g of OP-10 is added to the mixture and mixed until a homogeneous mass is obtained.

 PRI me R s NN 3-21 carry out analogously to example N 2.

The resulting inhibitor liquid from yellow to brown with a pour point of ^-10 ° C. to -50 ° ^C.

 The composition of the corrosion inhibitor is shown in the table.

The protective effect of the product is determined by the gravimetric method in circulation cells in an inhibited (with the addition of a reagent) standard hydrogen sulfide-containing solution according to GOST 9.506-87. A model of produced 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

 The test results are shown in the table. The protective effect of the prototype is also given there.

 Analysis of the data presented in the table shows that the proposed corrosion inhibitor is more effective compared to the prototype and technological when applied in low temperature conditions.

Claims (1)

A corrosion inhibitor in hydrogen sulfide-containing media containing an aminoparaffin derivative, characterized in that it additionally contains a nonionic surfactant and a solvent, and as a derivative of aminoparaffins, the reaction product is 1 mol of fatty acid with the number of carbon atoms C _{1 0} C _{2 0} and 0.1 1.0 mol of aminoparaffin with the number of carbon atoms C ₈ C _{2 0} in the following ratio of components, wt. The reaction product of 1 mol of fatty acid with the number of carbon atoms C _{1 0} C _{2 0} and 0.1 1.0 mol of aminoparaffin with the number of carbon atoms C ₈ C _{2 0} 10 50
Nonionic surfactant 10 30
Solvent Else

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