SU981244A1 - Method for suppressing biological activity of sulfate reducing bacteria - Google Patents

Description

(5) A METHOD FOR PRESSING THE VIABILITY OF SUL FATVOS ESTABLISHING VASUCHI X BAKTE RI and

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

When the oil reservoirs are flooded in order to maintain the reservoir pressure, the oil deposits are infected by various physiological groups of anaerobic bacteria, which can then develop in stagnant zones of the formations and injection wells.

The negative impact of the viability of bacteria in the oil fields is expressed both in reduced oil recovery by reducing the injectivity of wells and deterioration of rock permeability, and in the need for additional repair work on the process equipment. For example, the presence of SCB in the reservoirs. Oilfield pipelines and equipment leads to a decrease in the pH values of the aqueous medium, which causes intense microbiological corrosion of equipment. The presence of sulfate reducing bacteria in water containing mineral salts increases its corrosivity. In order to prevent the negative consequences of vitality

 SSCs use various methods to inhibit their growth.

Methods of combating SSC with the help of chemical reagents bactericum j5 have become widely spread.

A known method of preventing the growth of sulfate reducing bacteria under the action of chlorophenols added to water during the water flooding t

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A disadvantage of the known method of combating SSC is the low solubility of chlorophenols in water and high in oil, which can have a negative effect on refining processes due to poisoning of the catalysts of these processes with soluble organochlorine. In addition, the use of chlorophenols does not provide a high efficacy in suppressing the growth of sulfate reducing bacteria. The closest to the proposed method to the technical essence and the achieved effect is a method of suppressing the growth of sulfate reducing bacteria with the help of zinc salts of 5-chloro-2-hydroxy; 3,5-D chloro-2-hydroxy- and 3-chloro-β-oxybenzoic acid, the use of which in an amount of 0,, 1% by weight. leads to a degree of inhibition of the growth of SIS 2. However, these reagents have a rather low solubility in water (0.768-, 06 g / l at 30 ° C), as a result of which this method requires a large number of high-capacity tanks for pretreatment of water pumped into reservoir -.- In addition, these reactants are not available (1). The aim of the invention is to simplify and reduce the cost of the process with a high degree of inhibition of the growth of SVB. The goal is achieved by the fact that according to the method of suppression of SRB during oil flooding by introducing a chemical reagent into the injected water, sodium para-cumylphenolate is used as a chemical reagent. Sodium para-cumylphenolate is introduced in an amount of 0.05–1.0 wt. has k H OMIA well grown brutto for1 "ulu" it turns out it is processed in water, which para-cumylphenol with sodium hydroxide solution. Para-cumylphenol is a large-tonnage waste of phenol-acetone production by the cumene method and burned in furnaces mixed with fuel oil. The technology of water injection into the reservoir you & r depending on its properties. It is possible to carry out continuous water injection with the addition of 0.05-1.0 wt. para-cumylphenol and sodium by volume. injected water or periodically injected: first water with a high concentration of the reagent, and then water that does not contain dissolved bactericide. g The effectiveness of inhibiting the growth of SSC is determined by the following method: the reagent is injected into the commercial water containing SSC under sterile anaerobic conditions, in appropriate concentrations and kept for 2 hours at 32 C. Then, 1 ml of liquid is taken from these samples, and Samples are introduced into culture tubes. Postgate The tubes are incubated for 15 days at. At the same time put the control samples without the addition of a chemical reagent. The effectiveness of preventing the growth of bacteria is assessed by the degree of inhibition of the growth of SSC, the quote is determined by the formula C-f - Ci. where C. C is the hydrogen sulfide content, respectively, in the control and test sample (mg / l) 15 days after the start of the test. The tests were carried out in triplicate on cultures of anaerobic sulfate reducing bacteria contained in the reservoir water of the oilfield. The table shows the results of the determination of the degree of SSC reduction at the corresponding concentrations of sodium para-cumylphenoate. As can be seen from the table, the complete suppression of the viability of SRB is achieved at a concentration of the known reagent of 0.01-0.1 May%, and the proposed reagent is 0.05-1.0 wt., I.e. in terms of the degree of SSC suppression, the proposed method is somewhat inferior. known At the same time, the solubility of paracumylphenol sodium in water (at 4 ° C) is 208.2 g / l, i.e. 50–250 times the solubility of zinc salts of 5-chloro-2-hydroxy, 3 5-dichloro-2-hydroxy- and 3-chloro-oxybenzoic acids (0.768–4.06 g / l), which makes it possible to considerably simplify process technology, because using para-cumylphenol sodium does not require bulky equipment, since the dosage of the concentrated, aqueous solution of the reagent is carried out directly into the stream of water injected into the reservoir. The proposed reagent is obtained by neutralizing para-cumylphenol with an equimolar amount of sodium hydroxide solution. The 1-Lphenol is isolated from phenolic resins of phenol-acetone production, where its content varies between 20-25 May D.

Phenolic resins are not qualified applications, they are added to the boiler fuel,

The proposed reagent has a wide raw material base, its production will help to solve the urgent problem - the qualified and complex use of large-tonnage industrial waste, the production of para-cumylphenol. Sodium in industry can be adjusted in a short time without significant capital expenditures.

Despite the slightly lower bactericidal activity of sodium para-cumylphenol compared to the known reagent, its industrial use is ten times more cost-effective.,

The main advantages of the proposed method are: good efficiency of suppressing the growth of CBBJ; high processability of the method, since the reagent used is not explosion-proof and fire-resistant and well soluble in water; high profitability of the method, since the reagent used is obtained from para-ml mlphenol isolated from

non-qualified use of phenol-acetone and burned in kilns; expansion of the range of chemical products used as bactericides to inhibit the growth of SSC, which is very important because of the ability of microorganisms to adapt to the reagents used; wide source of raw materials for reagent production.

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The introduction of the proposed method in the industry can be carried out in a short time without significant capital expenditures.

Claims (2)

Claims t. The method of suppressing the viability of sulfate-reducing bacteria in the flooding of oil reservoirs by introducing a chemical reagent into the injected water, characterized in that, sodium s-cumylphenolate is used as a chemical reagent to simplify and reduce the cost of the process with a high degree of inhibition. too too 17.7 100 100 100 100 100TOO 2. The method according to claim 1, is also distinguished by the fact that sodium para-cumylphenolate is introduced in an amount of 0.05-1.0% may. Sources of information taken into account in the examination 1. US Patent No. 328821t, cl. 166-9., 1966, 2. USSR author's certificate 50 No. 8Y883, cl. From 02 F 1/50. 1979