SU1665029A1 - Bactericidal inhibitor for suppression of sulfate- reducing bacteria growth - Google Patents

Abstract

The invention relates to the oil industry, in particular to bactericidal inhibitors for suppressing the viability of sulphate-reducing bacteria, and can be used in the treatment of water injected into oil reservoirs. The purpose of the invention is to suppress the viability of sulphate-reducing bacteria while reducing the degree of corrosion of the process equipment. Methylendic or endic acid sodium salts are proposed as inhibitor bactericides. The reagent is introduced in the amount of 50 - 75 mg / l, which provides 100% suppression of sulphate-reducing bacteria and 75-80% protection of the metal of the oilfield equipment from corrosion.

Description

at

Yo

The invention relates to the oil industry and can be used to protect oil field equipment from microbiological and electrochemical corrosion.

The purpose of the invention is to suppress the viability of sulfate-reducing bacteria (SRB) while reducing the degree of corrosion of the process equipment.

As bactericide inhibitor sodium methylenedic or endic acids of formula are used.

CH3 fd rCOOMa (r ± VCOONa Ife-cooNa um U $ cooKla

Example. The effectiveness of inhibiting the growth of SIS is determined by a known method. The reagent is introduced into sterilized anaerobic water in commercial water containing sterile anaerobic conditions in appropriate concentrations and kept for 24 hours at 32 ° C. Then, 1 ml of liquid is taken from these samples and injected into bottles with Postgate nutrient medium. Bottles thermostatic at 32 ° C for 15 days. At the same time put control tests. The degree of SSC inhibition is determined by the formula

s С1сГС2 hyo%

where S is the degree of inhibition of the growth of sulfate reducing bacteria,%;

ABOUT

C SL O

yoo o

316

Ci and C2 - the content of hydrogen sulfide in the control and test samples after 15 days after the start of the test, mg / l.

The inhibitory effect of the reagent is determined on samples of St.3 in reservoir water in the presence of hydrogen sulfide at a concentration of 200 mg / l.

The degree of corrosion protection is determined by the formula

K1-K2 x100%

Z ki

where Z is the degree of corrosion protection,%;

Ki and K2 - metal corrosion rate (g / m2 h) in formation water in the presence of hydrogen sulfide at a concentration of 200 mg / l without a reagent and with a reagent.

The table shows the comparative data on the degree of inhibition of the growth of sulfate reducing bacteria and the degree of protection against corrosion of the sodium salt of methylene dioxide and the sodium salt of endic acid in comparison with the known inhibitor of sulfate reducing bacteria, the sodium salt of methyltetrahydrophthalic acid.

As can be seen from the table, the proposed reagents provide a high degree of inhibition of the growth of SSC with significantly lower concentrations (50-75 mg / l) of reagents compared with the known (200 mg / l).

In addition, the proposed reagents possess 15

20

The technology of using an aqueous solution of reagents can be carried out by continuously feeding them at concentrations of 50 and 5 mg / l, respectively. The main advantage of the proposed reagents in comparison with the known is the high bactericidal and protective efficacy against microbiological and electrochemical corrosion. In addition, the advantage lies in expanding the range of chemical products used to prevent the growth of SSC, which is very important since microorganisms have the ability to adapt.

Claims (1)

Claims of the invention Use of methylenedic or endic acid sodium salts 25 SOOMA COONa NSC COONa SOOYs as a bactericide inhibitor for suppressing the life of the sulphate-reducing bacteria and protecting it with inhibitory properties, since the oil field equipment does not have electrical reagents 50-75 mg / l of static chemical corrosion. Reagent Endic acid sodium salt Methyandic acid nitride salt Methyl-tragndrophthalic acid sodium salt (known inhibitor) 0 five 0 The corrosion protection stump is 72.5- 80 and 75.6-82.3%, respectively. The technology of using an aqueous solution of reagents can be carried out by continuously feeding them at concentrations of 50 and 5 mg / l, respectively. The main advantage of the proposed reagents in comparison with the known is the high bactericidal and protective efficacy against microbiological and electrochemical corrosion. In addition, the advantage lies in expanding the range of chemical products used to prevent the growth of SSC, which is very important since microorganisms have the ability to adapt. Claims of the invention Use of methylenedic or endic acid sodium salts SOOMA COONa NSC COONa SOOYs The degree of inhibition of the growth of sulfate bacteria,% Degree of corrosion protection, Z 78.5 90.0 100.0 100.0 90.0 100.0 100.0 100.0 70.0 72.5 80.0 85, A 71.0 75.6 82.3 88.5