RU2214479C1 - Method of production of inhibitor for protection against hydrosulfide and carbon dioxide corrosion in mineralized aqueous media - Google Patents

Abstract

FIELD: protection of oil field equipment against hydrosulfide and carbon dioxide corrosion; oil producing industry. SUBSTANCE: proposed method includes connection of ethylene oxide to fat amine followed by interaction of product with organic acid, for example, oleic or synthetic fat fraction C₅-C₉ or acetic acid at mole ratio of ethylene oxide: fat amine :acid equal to (8-30): 1 : (1-5), respectively. EFFECT: enhanced efficiency. 3 cl, 2 tbl

Description

 The invention relates to the protection of oilfield equipment from hydrogen sulfide and carbon dioxide corrosion and can be used in the oil industry.

 A known method of producing an inhibitor for the protection of oilfield equipment from corrosion in oil-water environments, comprising mixing tall oil of triethanolamine, a nonionic surfactant and a solvent (RF patent 2141542, MKI C 23 F 11/14, 1999). The known inhibitor is not effective enough in environments containing carbon dioxide.

 A known method of producing an inhibitor for protecting oilfield equipment from hydrogen sulfide and carbon dioxide corrosion by mixing tall oil, a mixture of bis (alkylhexaoxyethylene) phosphate, 2 ethylenediaminomethylphenol and / or 2,6-di (ethylenediaminomethyl) phenol and a solvent (RF patent 2141543, MKI C 23 F 11/167, 1999). A known inhibitor is not effective enough in highly saline aqueous media.

A known method of producing an inhibitor of hydrogen sulfide and carbon dioxide corrosion by mixing higher fatty acids, the product of the interaction of a fatty amine, ethylene oxide and organophosphorus compounds or a mixture of it with an ethoxylated amine with the number of carbon atoms C ₈ -C ₂₀ and the degree of hydroxyethylation 10-30 and additionally take surfactants and solvent (RF patent 2166001, MKI C 23 F 11/167). A known inhibitor is not effective enough in saline aqueous media.

 The closest in technical essence and the achieved effect is a method for producing an inhibitor of hydrogen sulfide and carbon dioxide corrosion in mineralized aqueous media by reacting a fatty amine, ethylene oxide and an organophosphorus compound (RF patent 2166002, MKI C 23 F 11/167). A known inhibitor is not effective enough in highly saline aqueous media.

 The basis of this task is the creation of an effective inhibitor of hydrogen sulfide and carbon dioxide corrosion in mineralized aqueous media.

The problem is solved in that in a method for producing an inhibitor of hydrogen sulfide and carbon dioxide corrosion in mineralized aqueous media, comprising sequential addition of ethylene oxide to a fatty amine followed by the interaction of the obtained product with an acid, organic oleic or synthetic fatty acid (FFA) fractions are taken C ₅ -C ₉ , or acetic with a ratio of components in moles of amine: ethylene oxide: acid 1: (8-30): (1-5). In a variant of the method, the resulting product is mixed with a surfactant (3-40 wt.%).

 In a preferred embodiment, the resulting products are dissolved in aliphatic and / or aromatic solvents to a concentration of 10-60%.

As the fatty amine, synthetic fatty amines of the C ₁₇ -C ₂₀ fraction according to TU 2413-047-00480689-95 are used; normal aliphatic primary amines of fraction C ₈ -C ₁₈ produced from coconut oils, for example, Genamine SS-100; aliphatic primary amines produced from oleic acid of a fraction of C ₁₉ -C ₂₂ .

 Ethylene oxide is taken in accordance with GOST 7568-88.

Organic acids take, for example, oleic acid according to TU 9145-012-00336444-96, synthetic fatty acids (FFA) of fraction C ₅ -C ₉ according to TU 23239-89; acetic acid according to GOST 61-75.

As a surfactant, take, for example, neonol grade AF ₉ -6 or AF ₉ -12 according to TU 2483-077-05766801-98.

 As a solvent, for example, aliphatic alcohols, for example methyl alcohol (MS), or ethyl alcohol (ES), or butyl alcohol (BS), or isopropyl alcohol (IPA), or vat residues from the production of butyl alcohols by oxosynthesis (COBPS), can be used. ) or aromatic hydrocarbons, for example AP-120/200 nefras, or AP-150/330 nefras, or ethylbenzene fraction (EBP) or butylbenzene fraction (BBP), or mixtures thereof, as well as technical formalin according to GOST 1625-89.

The corrosion inhibitor obtained by the claimed method is a homogeneous brown liquid with a density of 0.850-0.920 g / cm ³ , kinematic viscosity at 20 ^o C not more than 100 mm ² / s, pour point not higher than minus 30 ^o C.

 Example 1 of obtaining an inhibitor of the claimed method.

28.3 g of primary amines of the C ₁₇ -C ₂₀ fraction are loaded into the reactor in the presence of a catalyst (sodium or potassium hydroxides 40%), approximately 0.1-0.2 g. At a temperature of 110-150 ^° C, under a pressure of 4- 5 atm and with continuous stirring add 88 g of ethylene oxide. At the end of the hydroxyethylation reaction, the mass is cooled to 50-70 ^{° C.} and 29.4 g of oleic acid are charged with constant stirring. After loading is complete, stirring is continued for 30-40 minutes until a homogeneous mass is achieved.

 Examples 2-3 are carried out analogously to example 1, changing the initial components and their quantities (table 1).

 Example 4

To the obtained according to Example 1 reaction product in an amount of 180 g at a temperature of 30-50 ^o C with constant stirring 20 g of AF neonol ₉ -12. After dosing, stirring is carried out for another 30-40 minutes.

 Example 5-6 is carried out analogously to example 4, changing the starting components and their quantities.

 Example 7

To the product of interaction obtained in Example 1 in an amount of 25 g at a temperature of 25-40 ^{° C.} with continuous stirring, 37.5 g of AP 120/200 nephras and 37.5 g of methanol are added. The mixing process is carried out until a homogeneous mass is achieved.

 Example 8-10 is carried out analogously to example 7, changing the starting components and their quantities.

 Example 11

To the resulting product in an amount of 25 g of Example 1, 36 g of EBP and 36 g of methanol are successively added at a temperature of 25-40 ^{° C.} with continuous stirring until a homogeneous mass is achieved.

 Examples 12-24 are carried out analogously to example 11, changing the starting components and their quantities.

 Example 25 (prototype).

The protective effect of the proposed corrosion inhibitor is determined in the model of wastewater containing 100 mg / dm ^{3 of} hydrogen sulfide, or in the model of wastewater containing 1000 mg / dm ^{3 of} CO ₂ with a total salinity of aqueous media of 220-240 g / dm ³ , according to OST 39- 099-79 "Corrosion inhibitors. Methods for assessing the protective effect of corrosion inhibitors in oilfield wastewater." The test results are presented in table. 2.

 The data presented in table. 2, confirm the high efficiency obtained by the claimed method of a corrosion inhibitor in highly mineralized environments containing hydrogen sulfide and carbon dioxide.

Claims (3)

1. A method of producing an inhibitor of hydrogen sulfide and carbon dioxide corrosion in mineralized aqueous media by sequential addition of ethylene oxide to a fatty amine followed by the interaction of the obtained product with an acid, characterized in that the organic acid, oleic or synthetic fatty acid, of fraction C ₅ -C _{9 is} taken as acid or acetic, with a ratio in moles of ethylene oxide: fatty amine: acid (8-30): 1: (1-5), respectively. 2. The method of claim. 1, characterized in that the mixing is carried out of the product obtained according to Claim. 1, with a surfactant Neonol ₉ AF AF Neonol or -12 -6 _9, taken in an amount of 3-40 wt.%, Based on to the resulting product according to claim 1. 3. The method according to claim 1 or 2, characterized in that the product obtained according to claim 1 or 2 is dissolved in aliphatic and / or aromatic solvents and / or technical formalin in their ratio, wt.%:
The product obtained according to claim 1 or 2 - 10-60
Solvent - Other

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