RU1828917C - Method for suppression of vital activity of sulfate-reducing bacteria - Google Patents

Abstract

Usage: oil for industry, to prevent the growth of sulfate-reducing bacteria in various technological environments. SUMMARY OF THE INVENTION: diammonium salts of tetrahydrophthalic acid or methyltetrahydrophthalic acid are added to commercial water containing sulfate-reducing bacteria to a concentration of 25-75 mg / l. The method provides protection of oilfield equipment from electrochemical and microbiological corrosion. 2 tab.

Description

The invention relates to the oil industry, as well as to those areas where there is a need to prevent the growth and development of sulfate-reducing bacteria (SAS) in various technological environments.

The purpose of the invention is the protection of oilfield equipment from microbiological and electrochemical corrosion.

The goal is achieved by the fact that as a bactericide-inhibitor, ammonium salts of a dicarboxylic acid of a hydroaromatic series and its methyl derivative are proposed according to the formula

XX

COOMNts.

UCOONt-C

and

snch

c COONH

Human

was carried out by neutralizing the initial dicarboxylic acids with ammonia (32-34 wt.%), followed by evaporation of water and striking the excess of ammonia.

The synthesis of reagents of ammonium salts of a dicarboxylic acid of a hydroaromatic series and its methyl derivative proceeds according to the following scheme

UNPROFOR. UNITED NATIONS 32-3 / OLLO6yN,. Ng ° VLSS

uchhyunrze) Tsntsok Generous 4

 MUON 32-3W UNIVERSAL + H2 °

00

u s u

4

The ammonium salts of the dicarboxylic acids of the hydroaromatic series are synthesized. After evaporation and cooling, all obtained ammonium salts of the dicarboxylic acids are

soapy products are light brown.

The ammonium salts of the dicarboxylic acid and its methyl derivative are readily soluble in seawater and formation water, without the formation of a precipitate.

The effectiveness of suppressing the growth of SVB is determined by a known method.

Reagent in appropriate concentrations is introduced into the commercial water containing SVB under sterile, anaerobic conditions and incubated for 24 hours at 32 ° C. Then, 1 ml of liquid was taken from these samples and introduced into bottles with Postgate culture medium. The bottles are thermostated at 32 ° C for 15 days. At the same time, control samples were placed without the addition of a reagent.

The degree of suppression of SVB is determined by the formula

C1-C2 C1

100%

where S is the degree of suppression of the growth of SVB,%

Ct and C2 — hydrogen sulfide content in the control and test samples after 15 days after the start of the test, mg / L.

The experiment is carried out in triplicate.

Studies on the inhibitory effectiveness of hydrogen sulfide corrosion reagents were carried out in a special cell according to the procedure proposed by VNIISPT-oil. Seawater and a two-phase oil-reservoir system in the presence of hydrogen sulfide (CH2S - 200 mg / l) served as a corrosive medium. imitating the composition of oil wells in the Neftnye Kameni field. The water composition is given in table 1.

The water cut of oil wells was 90% in the volume ratio (water: oil). Intensive stirring created a liquid circulating oil-water emulsion, the fluid velocity in the cell was 1.0 m / s. Test duration 6 hours at 20 ° C. In the experiments, metal samples (Steel - 3) in the form of rectangles with an area of 9.5 cm were used.

The corrosion rate was estimated by the gravimetric method. The effectiveness of the reagents was determined by the corrosion rate with and without reagent. The results of determining the corrosion rate and the degree of corrosion protection are presented in Table 2.

As can be seen from the data table. 2, the proposed reagents provide a high degree of suppression of the growth of SFS at a significantly lower concentration of reagents.

In addition, the proposed technical solution has inhibitory properties in sea and formation waters,

The technology of using an aqueous solution can be carried out continuously and batchwise at a reagent concentration of 25-50 mg / l.

The main advantage of the proposed reagents in comparison with the known one is the high bactericidal and protective efficacy against microbiological and electrochemical corrosion.

A significant depolarizing effect at the cathode leads to the occurrence of electrochemical processes, which determines the electrochemical corrosion of oilfield equipment. Therefore, the reagent used must have a bifunctional effect, suppressing both types of corrosion.

Example 1. One: petroleum production. a well consisting of oil and produced water in the following ratio of 1: 9 and having the following corrosion-aggressive characteristics: H% S - 200 mg / l, SVB - 104 cells. in 1 ml.

Example 2. One: production of pump. wells: HaS content - 400 mg / l SVB-10 cells in 1 ml.

In accordance with the data presented, the minimum inhibitory concentration of the reagent comp. 25 mg / l. and the maximum is -75 mg / l.

Claims (1)

1. A method for suppressing the viability of sulfate-reducing bacteria by introducing a reagent into a fishing iodine. due to the fact that, in order to protect oilfield equipment from microbiological and electrochemical corrosion and to reduce reagent consumption, the reagent is used diammonium salts of tetrahydrophthalic acid or methyltetrahydrophthalic acid. 2, The method according to claim 1, characterized in that the reagent is introduced to a final concentration in the production water of 25-75 mg / l. Water chemistry Table 1