SU833560A1 - Bactericide of sulfate-reducing bacteria - Google Patents

Description

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The invention relates to suppressing the viability of sulphate-reducing bacteria in oil pipelines of the oil producing industry, namely, operating oil well equipment and producing oil by pumping water into porous formations to maintain reservoir pressure and displacing oil from the oil-bearing rock.

 The water used for injection into the oil reservoir often contains sulphates and microflora, which always contain hydrocarbonic acid, sulfate-reducing bacteria (SRB); As a result of contamination of the oil reservoir with microflora, various microbiological processes may occur.

As a consequence of the biogenic processes occurring in the oil-bearing layer, in the extracted products at a certain stage of operation of the oil field, the product of the life of the sulfate bacteria is found - hydrogen sulfide - where it was not at the beginning of the development. This leads to corrosion of the oil equipment, as a result of which various kinds of

accidents and oil spills; blockage of the formations due to the precipitation of iron sulphides (secondary products of the life of SSC and equipment corrosion) in the bottomhole zone of injection wells. In addition, hydrogen sulphide enters the oil products, oil, oil gas and produced water - significantly worsening

0 their quality. As a result of this, in practice, great complications are created in the field preparation, transportation and subsequent processing at oil and gas factories 5, containing hydrogen sulfide.

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Various corrosion inhibitors are used to prevent corrosion of oil equipment.

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However, their use does not lead to the complete elimination of the corrosion process, since the reason for the occurrence of corrosion is sulfate-reducing bacteria.

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To solve the problem of eliminating the consequences of a biocenosis, it is more appropriate to use various methods for the suppression of the vital activity of microorganisms: physical (sterilization, radiation and

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etc.) and chemical (bactericides, bacteriostats).

The most effective means of combating biological corrosion is the treatment of contaminated media with bactericides — chemical reagents that destroy bacteria and bacteriostat No. 4, which inhibit the growth of microorganisms for some time T2.

Due to the fact that bacteria are readily adaptable to reagents with bacteriostatic properties, it is more advisable to use bactericides.

However, the experience of combating microbiological corrosion has shown that universal bactericides do not exist. In each particular case, a careful laboratory study of the protective effect of a whole range of reagents on cultures of bacteria isolated from the environment where the bactericide is planned is necessary, taking into account the specific living conditions of the microorganisms.

Chemicals affecting the viability of microorganisms are often the cause of the mutation process in a bacterial cell, which leads to modification changes in their structures. Virtually one mutant is able to give rise to a whole clone of microorganisms with a new specific property. The probability of occurrence of such forms of microorganisms is very high.

In connection with the above, the need has arisen for the results of mesophilic

the range of bactericides used in the fight against sulfate reduction, because the likelihood of a mutant resistant to two or more biologically active substances is reduced. Treatment of injection wells of oil fields with several bactericides in a complex or in turn gives a much more tangible positive bactericidal effect.

The use of p-nitrobenzyl bromide in the chemical industry as an intermediate product for the synthesis of sarcolysine h is known.

The purpose of the invention is to detect the bactericide of sulfate reducing bacteria in oil fields.

The goal is achieved; using as a bactericide sulfate reducing bacteria p-nitrobenzyl bromide, which suppresses the viability of the accumulative culture of sulfate reducing ones. bacteria isolated from the field waters of injection wells of an oil field.

The essence of the invention is that p-nitrobenzyl bromide, not previously used for these purposes, and which suppresses the growth of microorganisms by 99-100%, is proposed to suppress the viability of sulfate-reducing bacteria. at a concentration of 10 mg / l and more.

Example. The treatment is subjected to water containing the culture of sulfate-reducing bacteria.

The results of the experiment are given in table.1 and 2.

Table i of p-nitrobenzyl bromide tests on the cumulative culture of sulfate reducing bacteria (SSC)

Continuation of taOl one

Continuation of table 2

The proposal to use p-nitrobenzyl bromide as a bactericide of sulfate reducing bacteria and suppress their viability in water pumped into oil reservoirs, as well as to suppress microflora already present in oil-bearing strata, is of great national importance.

Apply p-nitrobenzyl bromide on. oil fields leads to the prevention of contamination of oil reservoirs of oil fields with sulfate reducing bacteria; to improve the quality of petroleum products, gas, produced water; to reduce the processes of bio-corrosion and to increase the service life of oil field equipment.

In addition, the suppression of the growth of sulfate-reducing bacteria has a nature-protective meaning:

improves the condition of the discharge system 30 and the quality of the discharged water ..

Claims (3)

1.Gonic A, A. Correspondence and oilfield equipment and measures to prevent it. M., Nedra, 1976, p. 192. 2. Avak and Z.A. Protection of petroleum products from biological destruction. -, Applied biochemistry and microbiology, t. 11, 1975, 4, p. 526-534. 3. Chemist Handbook, v.2, M., Himi, 1963, p. 147.