The method of producing corrosion inhibitor-bactericide

(57) Abstract:

The invention relates to a method for protection of oilfield equipment to suppress microorganisms and inhibiting corrosion in systems of production, transportation and storage of oil and savedname oil reservoirs, and can be used in the oil industry. The objective of the invention is the creation of a technology that does not require special equipment method of obtaining a product having the effect of inhibiting corrosion and inhibit the growth of sulfate reducing bacteria (SRBs). The problem is solved so that, in the method of producing corrosion inhibitor - bactericide by reacting 2-methyl-5-ethylpyridine (IEP) with (C₁₀-C₁₆) alkylbromides (AB) at elevated temperature map and AB take at a molar ratio of 1.05:1, respectively, and the IEP is introduced into the process in three stages 0.35 mole with interval time-40-50 minutes, and the process is conducted at a temperature of 120-140°C for 2-5 hours, the resulting product is mixed with a solvent to obtain a solution containing the product in the amount of 20-70 wt.%. The resulting reagents have compared to the prototype Bo the SSC. table 2.

The invention relates to a method for protection of oilfield equipment, designed to suppress microorganisms and inhibiting corrosion in systems of production, transportation and storage of oil and savedname oil reservoirs, including secondary recovery, and can be used in the oil industry.

A method of obtaining a corrosion inhibitor is a Quaternary pyridinium salts interaction alkyl substituted pyridines with alkylhalogenide when heated to 90°C for 2 hours (application Germany No. 2813126, CL 23 F 11/10, publ. 12.10.1978 year).

However, the known corrosion inhibitors are not effective in hydrogen sulfide-containing oilfield environments.

A method of obtaining corrosion inhibitor - bactericide by the interaction of celibrated with 2-methyl-5-ethylpyridine in a stream of nitrogen at a temperature of 150-160°C for 6 hours followed by purification of the resulting product is ethyl ether. The output 76% together with the hydrobromide, which is a side reaction product (U.S. Patent No. 2909525, class of 260-240, 1959).

However, the known method is not enough economical as cleaning stage requires the ukta, requires create an inert atmosphere.

Closest to the present invention is a method of producing a corrosion inhibitor - bactericide - N-alkyl-2-methyl-5-ethylenedibromide, where the alkyl, C₈-C₂₀. The process is carried out at a temperature of 110°C for 1 hour, the reaction products purified additionally by ethyl acetate. The yield of the target product is 85% together with hydrogen bromide (Japan patent No. 37-7237, class C 07 D 213/20, publ. 05.07.1962). The disadvantages of this method are: low-tech, the need for purification stages ethyl acetate, the fire this stage, the duration of the process.

Education byproduct hydrobromide 2-methyl-5-ethylpyridine adversely affect the antibacterial and corrosion performance of alkylpyridinium, therefore, when carrying out the process on an industrial scale should the process proceed under conditions that would minimize the formation of by-product, and also to eliminate the purification step and to obtain a highly efficient product.

The problem to which this invention is directed, is to create a new method of obtaining a highly effective corrosion inhibitor - bactericide, cha can be solved as follows, in the method of producing corrosion inhibitor - bactericide by reacting 2-methyl-5-ethylpyridine (Mer) were synthesized (AB) at elevated temperatures 2-methyl-5-ethylpyridine and (C₁₀-C₁₆) were synthesized taken at a molar ratio of 1.05:1, respectively, and 2-methyl-5-ethylpyridine introduced into the reaction in three stages 0.35 mole with interval time-40-50 minutes and the process is conducted at a temperature of 120-140°C for 2-5 hours, the resulting product is, if necessary, is mixed with a solvent to obtain a solution containing the product in the amount of 20-70 wt.%.

As the solvent used aliphatic alcohols methyl (MS) or ethyl (ET), or isopropanol (IPA), or butyl (BS), or isobutyl (CHD) or a mixture of aliphatic and aromatic solvents, for example: oil solvent (nefras, THE 10214-78) or heavy oil solvent (nefras T, TU 38.101809-90); or a heavy oil solvent (nefras ARTICLE, THE 38.1011049-98); or middle distillate process (SDT, TU 38.401-58-196-97); or diethylethanamine fraction of the production of cumene (DABF, THE 38.102144-90); or ethylbenzol fraction of the production of cumene in the alkylation of benzene by propylene (ABF, THE 6-01-10-37-78); reticence 1-0,25-4, respectively.

The were synthesized charge saturated, primary, normal structure containing carbon atoms in the alkyl radical of 10 to 16.

The claimed method of receiving is carried out in an industrial reactor equipped with a stirrer and a jacket for cooling water or steam; download allylbromide and restoration, stirred and heated to a temperature of 120-140°C for 2-5 hours, and the IEP is administered in three stages at a 1/3 of the calculated amount of the reagent with interval time-40-50 minutes the resulting product to give it manufacturability without reducing effect, is dissolved in a solvent.

Examples of the method.

Example 1. In the reactor load 250 kg (1 mol) of dodecylamine and one third of the calculated amount IEP 42,5 kg (0,35 mol). The reaction mass is stirred and heated to 120°C. When the temperature rises above this value in the jacket cooling water is supplied. After 40 min, poured a leap in the number 42,5 kg (0,35 mol) and continue mixing. After 40 minutes add the remaining amount of the IEP 42,5 kg (0,35 mol). The process temperature constant in the range of 120-130°C and the process is continued for 5 hours.

The content of Quaternary pyridinium salts in point is those obtained by the method prototype, and that affects the efficiency of products derived the claimed method as a corrosion inhibitor - bactericide.

Examples 2-10. Carried out in the same manner as example 1, changing the source were synthesized and conditions of the method.

Analysis of the degree of completeness of the process, content hydrobromide of metiletilpiridin and Quaternary pyridinium salts carried out by potentiometric titration.

The data in examples 1-10 are summarized in table 1.

The resulting interaction products have antibacterial and anti-corrosion activity. Antibacterial efficiency determined according to EP 03-00147275-067-2001 “Assessment of contamination oilfield environments and bactericidal action of reagents relative to sulfate-reducing bacteria”.

The model produced water free from oxygen, infect sulfatoxymelatonin bacteria (SRB) isolated from oilfield produced water from different fields, and is treated with a reagent in the form of a 0.5% aqueous solution at certain dosages. Samples incubated 24 h at 20-22°C, after which to detect cell viability SSC is javnosti actions reagent appreciate the amount of released hydrogen sulfide relative to the control experiments, without the addition of the reagent. The degree of inhibition of growth of SSC is calculated by the formula

where n is the degree of suppression of the SSC, %;

WITH_tothe concentration of hydrogen sulfide in the experience without adding reagent, ml/l;

With the concentration of hydrogen sulfide in the experience with the addition of the reagent, ml/L.

Protective effect determine the gravimetric method of circulating cells in inhibited (with the addition of reagent) standard hydrogen sulfide-containing solution according to OST 39-099-79. “Corrosion inhibitors. Method of assessing the effectiveness of the protective action of corrosion inhibitors in oil-field wastewater”.

As an aggressive environment using the model produced water with a density of 1.12 g/DM³when hydrogen sulfide concentration of 100 mg/DM³. Test duration 6 hours. The data in examples 1-10 and the results are given in table 2.

Presented in the data tables it is seen that the obtained products have interaction in comparison with the product obtained by the method prototype, higher properties of inhibiting corrosion at the dosage of 15 mg/DM³the products obtained by the present method, have the effect of 90-96%, while the product mg/DM³). The claimed method of producing corrosion inhibitor - bactericide does not require purification stages as you get the product of the interaction of (100% output).

The method of producing corrosion inhibitor - bactericide by reacting 2-methyl-5-ethylpyridine with were synthesized at elevated temperature, characterized in that 2-methyl-5-ethylpyridine and (C₁₀-C₁₆) allylbromide take at a molar ratio of 1.05:1, respectively, and 2-methyl-5-metiletilpiridin introduced into the reaction in three stages 0.35 mol with interval time-40-50 minutes and the process is conducted at a temperature of 120-140° for 2-5 h, the resulting product is, if necessary, is mixed with a solvent to obtain a solution containing the product in the amount of 20-70 wt.%.