RU2467050C1 - Composition for reducing oil viscosity in low-temperature deposit conditions - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to the oil extraction industry and specifically to a composition for reducing oil viscosity and increasing reservoir recovery in low-temperature oil reservoir conditions using microorganisms. The composition for reducing oil viscosity in low-temperature deposit conditions is based on an oil-displacing composition which contains ammonium nitrate, a surfactant, carbamide and water, where an aqueous urobacteria extract is added to the composition, said extract containing 800-840 million cells/ml, obtained by constantly stirring for 120 minutes the mass of manure cake in water in ratio 10:100 respectively, with the following ratio of components, g/l: ammonium nitrate 14-142, nonionic surfactant AF_9-12 or NP-40 or NP-50 4.8-48, anionic surfactant - volgonat or sulphonol 2.4-24, carbamide 28.6-286, said aqueous urobacteria extract 20-50 ml/l, water - the balance up to 1 l.

EFFECT: high efficiency of recovery of high-viscosity oil in conditions of a high-viscosity oil deposit with low reservoir temperature (+10 - +50), cutting costs while eliminating steam-thermal effect.

21 ex, 4 tbl, 3 dwg

Description

The invention relates to the oil industry, and in particular to a composition for reducing the viscosity of oil and increasing oil recovery in a low-temperature oil reservoir using a urease group of microorganisms.

Currently, the production of viscous oil in fields with low reservoir temperature is carried out, as a rule, using steam-thermal methods or their combination with physicochemical methods. So, on the perm-carbon deposit of the high-viscosity oil of the Usinsky field (Komi Republic), steam is injected into the reservoir or steam is cyclic, while steam is injected into the reservoir under pressure at a temperature of 300-350 ° C, which is economically costly because it involves the installation of steam and thermal generators.

A known composition for increasing oil recovery at a late stage of development using microorganisms (RF patent No. 2180396). The composition for increasing oil recovery as a source of microorganisms contains activated sludge, as nutrients that stimulate the growth and activity of microbial cells, bottoms from the production of synthetic glycerol, additionally contains polydimethyl diallylammonium chloride. The specified composition has biochemical activity with the release of methane and CO ₂ , which helps to reduce the viscosity of oil and increase oil recovery. The use of the composition to increase oil recovery of low-temperature deposits of high-viscosity oil is not provided.

A known method of producing highly viscous oil, including the introduction of a displacing agent and a thinning composition into the formation (RF patent No. 2195549). As a fluidizing agent, hydrocarbon-oxidizing bacteria with nutrient salts in an aqueous solution are used. The injection of a diluent is carried out cyclically.

This method is not effective enough due to the fact that the products of the metabolism of hydrocarbon-oxidizing bacteria are compounds (aldehydes, ketones, bio-surfactants, biopolymers) that facilitate the desorption of oil from porous rock of the formation. Under these conditions, the release of gaseous products is minimal and does not contribute to lowering the viscosity of oil.

A known microbiological method of increasing oil recovery using a strain of bacteria Erwinia species with high destructive activity in contact with oil hydrocarbons, plant materials and animal waste (RF patent No. 2103359). The strain Erwinia species was isolated from oil-bearing rock and selected in the process of processing manure, bird droppings in anaerobic and aerobic conditions. This strain is capable of decomposing oil and oil products, organic substrates in plant materials and animal waste under aerobic and anaerobic conditions at high speed with the release of gaseous products. The disadvantage of the proposed method is a complex and expensive process of selection and biomass accumulation for the technological process. The strain is largely selected for the decomposition of organic substrates in plant materials and animal waste. In the process of biodegradation of oil hydrocarbons by this strain, the release of gaseous products is negligible.

A known method of increasing oil recovery when introducing into the reservoir a population of aerobic bacteria (patent WO No. 9213172). Water injected into the reservoir under pressure contains dissolved oxygen and mineral nutrients. Microorganisms adapt and multiply, using oil as the main source of carbon, oxygen dissolved in water as the main source of oxygen. During the biooxidation of oil hydrocarbons, metabolic products are formed that promote the desorption of oil from the porous rock of the formation. This method is technologically advanced in conditions of light oil deposits.

Known microbiological method of increasing the extraction of hydrocarbons (GB patent No. 2450502). According to this method, the required amount of a biological product containing microorganisms actively utilizing hydrocarbon raw materials with the formation of metabolic products contributing to the displacement of oil is introduced into the oil reservoir. This method of increasing the extraction of hydrocarbon raw materials is effective for a short period of time, since the vital activity of microflora is not supported by the introduction of stimulating nutrient substrates. Its application is designed for light oil fields.

Known enzymatic method of reducing the viscosity of oil (US patent No. 5529930). A method for reducing the viscosity of oil liquids (heavy oils and bitumen) using a biocatalyst comprising microorganisms Rhodococcus rhodochrous ATCC No.53968 and their enzymes is proposed. Due to the action of the biocatalyst, carbon-sulfur bonds in heterocycles are destroyed and new compounds are formed that contribute to a decrease in the viscosity of oil. The biocatalytic method for reducing oil viscosity is effective for oils with a high concentration of sulfur-containing compounds. The range of action of biotechnology based on the use of a single strain is limited.

Closer in composition to the present invention is a composition for enhancing oil recovery (RF patent No. 2361074), containing the following components, wt.%: Nonionic surfactant 1.0-2.0; ionic surfactant 0.5-1.0; ammonium nitrate 8.0-20.0; ammonium thiocyanate 0.1-0.5; carbamide 15.0-40.0; water the rest. A method for developing deposits of high-viscosity oils by means of steam and heat treatment involves injecting alternating rims of steam and a composition for increasing oil recovery containing urea, which decomposes under the influence of temperature to produce carbon dioxide, which reduces the viscosity of oil. The main disadvantages of the composition include the impossibility of its use for low-temperature viscous oil fields without heat and steam.

The objective of the present invention is to increase the efficiency of oil recovery of highly viscous oil in the conditions of an oil reservoir with a low reservoir temperature (+ 10 ÷ + 50 ° C), reducing costs while eliminating steam and thermal effects by reducing the viscosity of the oil when an environmentally friendly extract of urobacteria with high urease is introduced into the oil reservoir activity for the purpose of its enzymatic hydrolysis, simultaneously with a solution of an oil-displacing composition containing urea. To reduce the viscosity of oil and increase oil recovery of low-temperature (20-40 ° C) deposits of viscous oils, it is proposed to introduce into the reservoir a solution of an oil-displacing surfactant composition based on urea and an enzyme that hydrolyzes urea without heat exposure, or an extract of urobacteria producing this enzyme. Urobacteria hydrolyze urea to ammonia and carbon dioxide, the total hydrolysis reaction: CO (NH ₂ ) ₂ + H ₂ O = CO ₂ + 2NH ₃ . This reaction has no energy value and is carried out by the bacterial enzyme - urease. During the enzymatic hydrolysis of urea, an ammonia buffer system and carbon dioxide (CO ₂ ) are generated directly in the formation. Carbon dioxide dissolves mainly in oil and reduces its viscosity without the use of heat, which contributes to its better displacement from the reservoir. Ammonia buffer system provides high oil-displacing properties of surface-active substances (surfactants) that make up the composition.

The composition of the composition includes urea, ammonium nitrate and a mixture of interchangeable nonionic (nonionic surfactants) and anionic (ACAS) in a 2: 1 ratio. Volongonate or sulfonol were used as AAS, nonionic surfactants — neonol AF 9-12 or NP-40, or NP-50 with varying degrees of hydroxyethylation of the general formula RArO (CH ₂ CH ₂ O) _n H, where Ar is a benzene ring, R is a long hydrocarbon radical C ₉ ), n is the average number of hydroxyethyl groups in the nonionic surfactant molecule (degree of hydroxyethylation), structural formula:

- nonionic surfactants produced in the Russian Federation neonol AF 9-12 - ethoxylated isononylphenols based on propylene trimmers with a degree of oxyethylation 12;

- Nonionic surfactants produced in China - NP-40, NP-50 - ethoxylated isononylphenols with a degree of hydroxyethylation of 40, 50, respectively.

- APAA produced by the Russian Federation volgonate - sodium alkyl sulfonate, chemical formula R-SO ₂ ONa with a chain length of the alkyl radical C ₁₁ -C ₁₈ obtained from n-paraffins.

- APAA produced by the Russian Federation sulfonol - sodium salt of alkylbenzenesulfonic acid, chemical formula RC ₆ H ₄ SO ₃ Na.

The technical result is achieved by the fact that the composition for increasing oil recovery, containing urea, ammonium nitrate, a mixture of nonionic surfactants - AF 9-12, or NP-40, or NP-50 and APAA - volgonate or sulfonol and water, additionally contains an extract of urobacteria containing 800-840 million cells / ml, obtained with constant stirring for 120 minutes, the mass of dung in water in a ratio of 10: 100, respectively, with the following ratio of components, g / l:

1. Ammonium nitrate 14-142 2. Nonionic surfactant (AF _9-12 , or NP-40, or NP-50) 4.8-48 3. Anionic surfactant (volgonate or sulfanol) 2.4-24 4. Urea 28.6-286 5. Water up to 1000 ml 6. An aqueous extract of urobacteria containing 800-840 million cells / ml, obtained with constant stirring for 120 minutes in the ratio dung: water 10: 100 20-50 ml / l

An aqueous extract of urobacteria for the hydrolysis of urea is obtained from the waste products of farm animals (dung, manure) at different concentrations of dung mass (3, 6 and 10%) in water and mechanical mixing time (30, 60 and 120 minutes). The pH of the stock solution is 6.4. In the process of hydrolysis of urea, which is a small amount in dung, the pH of the extract in the first day increases from 6.4 to 8.1. The maximum pH for 30 days is 8.3 at a dung concentration of 10% and a stirring time of 120 minutes (table 1).

As follows from table 1, the number of urobacteria in the extract depends on the mass of introduced dung and, to a greater extent, on the mixing time. The maximum number of microorganisms 800-840 million cells / cm ³ obtained with a ratio of dung: water 10: 100, mixing time - 120 minutes

With the simultaneous introduction of an extract of urobacteria and an oil-displacing composition containing surfactants and urea into the oil reservoir, carbon dioxide CO ₂ and ammonia are generated directly in the reservoir as a result of the action of urease produced by urobacteria. Dissolving in oil, CO ₂ reduces its viscosity, which contributes to the displacement of oil from the reservoir. Ammonia, dissolving in water, forms an ammonia buffer system with an increase in pH to 8.4–9.6 units, which increases the washing properties of the composition and also contributes to the displacement of oil from the reservoir. Thus, an increase in the oil recovery of a viscous oil of a low-temperature deposit is achieved due to two effects: a decrease in the viscosity of the oil and an increase in the washing properties of the oil-displacing composition.

The enzymatic hydrolysis of urea by a group of urobacteria with the release of ammonia and carbon dioxide is a key process in reducing the viscosity of oil in an oil reservoir with a low reservoir temperature (10 ÷ 50 ° C).

Case Studies

Example 1. The hydrolysis of urea (286 g / l) is carried out at 30 ° C as part of a 50% solution of a composition containing interchangeable AAS (volgonate) and nonionic surfactants (AF 9-12) and adding 20 ml / l of an aqueous extract of urobacteria containing 800 million cells / ml, obtained with stirring for 120 minutes in the ratio dung: water 10: 100. The composition of the 50% solution of the oil-displacing composition, g / l: nonionic surfactants (AF 9-12, or NP-40, or NP-50) - 48, nonionic surfactants (volgonate or sulfanol) - 24, ammonium nitrate - 142, urea - 286 water - 500. The results are shown in table 2.

Example 2. The hydrolysis of urea (286 g / l) is carried out at 30 ° C as part of a 50% solution of the composition containing 24 g / l as a surfactant (sulfanol), 48 g / l of a nonionic surfactant (AF 9-12) with the addition of 50 ml / l of an aqueous extract of urobacteria containing 820 million cells / ml, obtained with stirring for 120 minutes in the ratio of dung: water 10: 100 (Table 2). The results obtained are similar to the data of example 1.

Example 3. Hydrolysis of urea is carried out at 30 ° C in the composition of a 50% solution of the composition containing APS (sulfanol) - 24 g / l, nonionic surfactants ((NP-40) - 48 g / l with the addition of 40 ml / l of water extract urobacteria containing 830 million cells / ml, obtained with stirring for 120 minutes in the ratio dung: water 10: 100 (Table 2). The results are similar to those of example 1.

Example 4. Hydrolysis of urea is carried out at 30 ° C as part of a 50% solution of the composition containing interchangeable ACAS (volgonate) - 24 g / l, nonionic surfactants ((NP-50) - 48 g / l with the addition of 30 ml / l of aqueous urobacterium extract containing 840 million cells / ml, obtained with stirring for 120 minutes in the ratio dung: water 10: 100 (Table 2). The results are similar to those of example 1.

Example 5. For the following experiments, the composition is diluted 2 times. Hydrolysis of urea is carried out at 30 ° C as part of a 25% solution of the composition containing, g / l: urea - 143, ammonium nitrate - 71, interchangeable ASA (volgonate) - 12, nonionic surfactants (AF 9-12) - 24 when added 20 ml / l of an aqueous extract of urobacteria containing 800 million cells / ml, obtained with stirring for 120 minutes in a ratio of dung: water 10: 100. The results are shown in table 2.

Examples 6. Hydrolysis of urea (143 g / l) is carried out as part of a 25% solution of a composition containing AAS - volgonate, nonionic surfactants - NP-40 with the addition of 30 ml / l of an aqueous extract of urobacteria containing 820 million cells / ml, obtained with stirring for 120 minutes in the ratio dung: water 10: 100 at 30 ° C (table 2). The results obtained are similar to the data of example 5.

Example 7. The hydrolysis of urea (143 g / l) is carried out as part of a 25% solution of the composition containing as an AAS - sulfanol and nonionic surfactants - AF 9-12 with the addition of 50 ml / l of an aqueous extract of urobacteria containing 840 million cells / ml obtained with stirring for 120 minutes in the ratio dung: water 10: 100. The experiment was carried out at 30 ° C (table 2). The results obtained are similar to the data of example 5.

Example 8. Hydrolysis of urea (143 g / l) is carried out as part of a 25% solution of the composition with interchangeable AAPA - sulfanol and nonionic surfactants - NP-50 with the addition of 40 ml / l of an aqueous extract of urobacteria containing 830 million cells / ml, obtained with stirring 120 minutes in a ratio of dung: water 10: 100. The experiment was carried out at 30 ° C (table 2). The results obtained are similar to the data of example 5.

Example 9. For the following experiments, a 50% solution of the composition is diluted 5 times. Hydrolysis of urea is carried out as a part of a 10% solution of a composition containing, g / l: urea - 57.2, ammonium nitrate 28.4, ACAS (volgonate) - 4.8 and nonionic surfactant (AF 9-12) - 9.6 with the addition of 20 ml / l of water extract urobacteria containing 840 million cells / ml, obtained with stirring for 120 minutes in the ratio dung: water 10: 100. The results are shown in table 2. As follows from the data in table 2, an increase in pH due to the hydrolysis of urea was noted after 2 hours, by the 20th day the pH reaches a maximum value of 9.6.

Example 10. The hydrolysis of urea (57.2 g / l) is carried out as part of a 10% solution of a composition containing interchangeable AAPA (volgonate) and nonionic surfactant (NP-40) in a ratio of 1: 2 with the addition of 50 ml / l of an aqueous extract of urobacteria containing 830 million cells / ml obtained with stirring for 120 min in the ratio of dung: water 10: 100 (table 2). The results obtained are similar to the data of example 9.

Example 11. The hydrolysis of urea (57.2 g / l) is carried out as part of a 10% solution of the composition containing, as interchangeable, ACAS (sulfonol) and nonionic surfactants (AF 9-12) with the addition of 30 ml / l of an aqueous extract of urobacteria containing 800 million cells / ml obtained with stirring for 120 minutes in the ratio dung: water 10: 100 (table 2). The results obtained are similar to the data of example 9.

Example 12. The hydrolysis of urea (57.2 g / l) is carried out as part of a 10% solution of the composition containing interchangeable AAPA (sulfonol) and nonionic surfactant (NP-50) with the addition of 40 ml / l of an aqueous extract of urobacteria containing 820 million cells / ml obtained with stirring for 120 minutes in the ratio dung: water 10: 100 (table 2). The results obtained are similar to the data of example 9.

Example 13. For the following experiments, a 50% solution of the composition is diluted 10 times. Hydrolysis of urea is carried out as a part of a 5% solution of a composition containing g / l: urea - 28.6, ammonium nitrate - 14.2, interchangeable ACAS (volgonate) - 2.4 and nonionic surfactants (AF 9-12) - 4.8 with the addition of 20 ml / l aqueous urobacterium extract containing 840 million cells / ml, obtained with stirring for 120 minutes in the ratio dung: water 10: 100. The results are shown in table 2.

Example 14. The hydrolysis of urea (28.6 g / l) is carried out as part of a 5% solution of the composition containing AAS (volgonate) and nonionic surfactants (NP-40) with the addition of 50 ml / l of an aqueous extract of urobacteria containing 800 million cells / ml obtained with stirring for 120 minutes in the ratio dung: water 10: 100 (table 2). The results obtained are similar to the data of example 13.

Example 15. The hydrolysis of urea (28.6 g / l) is carried out as part of a 5% solution of the composition containing AAS (sulfonol) and nonionic surfactants (AF 9-12) with the addition of 30 ml / l of an aqueous extract of urobacteria containing 820 million cells / ml obtained with stirring for 120 minutes in the ratio dung: water 10: 100 (table 2). The results obtained are similar to the data of example 13.

Example 16. The hydrolysis of urea (28.6 g / l) is carried out as part of a 5% solution of the composition containing AAS (sulfonol) and nonionic surfactants (NP-50) with the addition of 40 ml / l of an aqueous extract of urobacteria containing 830 million cells / ml obtained with stirring for 120 minutes in the ratio dung: water 10: 100 (table 2). The results obtained are similar to the data of example 13.

Example 17. In more detail, the parameters of the enzymatic hydrolysis of urea in the composition of a 10% solution of oil-displacing composition carried out in the process of temperature control for 30 days at 30 ° C with the addition of 50 ml / l of urobacteria extract containing 800-840 million cells / ml, obtained at a ratio of dung: water 10: 100, are presented in table 3.

The composition of the 10% solution of the composition, g / l: nonionic surfactants (AF 9-12) - 9.6, nonionic surfactants (volgonate) - 4.8, ammonium nitrate - 28.4, urea - 57.2, water - 900.

From the table it follows that the cultivation of urobacteria in a solution of a composition containing 57.2 g of urea at 30 ° C is accompanied by an increase in the number of urobacteria, active utilization (99.9%) of urea, the accumulation of ammonium ions and CO ₂ , and an increase in the pH of the medium to 9.6 units. on the 4th day (table 3).

The influence of the products of the enzymatic hydrolysis of urea on the change in the viscosity of oils in the low-temperature deposits of Tamsagbulag (Mongolia) and Usinsky (Russia) was studied by the method of vibration viscometry using a vibration reokinetics viscometer with a tuning fork sensor. The studied viscous oils are a colloidal dispersed system with markedly expressed non-Newtonian properties, which weaken after contact with urobacteria in the solution of the composition.

Example 18. The influence of the products of enzymatic hydrolysis of urea on the oil viscosity of the Tamsagbulag deposit, Mongolia is studied during oil thermostatting in contact with an extract of urobacteria added to a 10% solution of an oil-displacing composition containing, g / l: urea - 57.2, ammonium nitrate - 28.4 , AAS (volgonate) - 4.8 and nonionic surfactants (AF 9-12) - 9.6, pH - 6.4. To do this, 100 ml of a 10% solution of the composition is added to a thermostatic cell, 50 ml / l of urobacteria extract is added containing 830 mln cells / ml, obtained with stirring for 120 min in the ratio dung: water 10: 100 and 10 ml of the studied oil. Thermostating is carried out for 60 days at a temperature of 40 ° C, close to the reservoir. Oil viscosity decreases after temperature control by 1.5 times. The results of the study are shown in table 4.

Example 19. The influence of the products of enzymatic hydrolysis of urea on the oil viscosity of the Tamsagbulag deposit, Mongolia is studied in the process of oil temperature control in contact with an extract of urobacteria added to a 50% solution of an oil-displacing composition containing, g / l: urea - 286, ammonium nitrate - 142 , ACAS (sulfanol) - 24 and nonionic surfactants (NP-40) - 48. To do this, 100 ml of a 50% solution of the composition are added to a temperature-controlled cell, 30 ml / l of urobacteria extract containing 800 million cells / ml obtained at the ratio of dung: water 10: 100 and mixing SRI 120 minutes and 10 ml of the studied oil. Thermostating is carried out for 60 days at a temperature of 40 ° C, close to the reservoir. The viscosity of oil decreases after temperature control by 1.3 times. The results of the study are shown in table 4.

Example 20. The influence of the products of enzymatic hydrolysis of urea on the oil viscosity of the Usinsky field is studied during oil thermostatting in contact with an extract of urobacteria added to a 25% solution of an oil-displacing composition containing urea - 143, ammonium nitrate - 71, APA (volgonate) - 12 and nonionic surfactants (NP-50) - 24 g / l. To do this, 100 ml of a 25% solution of the composition is added to a thermostatic cell, 40 ml / l of urobacteria extract is added containing 820 mln cells / ml, obtained with stirring 120 min dung: water in a ratio of 10: 100 and 10 ml of oil. Thermostating is carried out for 60 days at a temperature of 40 ° C, close to the reservoir. Oil viscosity decreases after temperature control 1.6 times. The results of the study are shown in table 4.

Example 21. The influence of the products of the enzymatic hydrolysis of urea on the oil viscosity of the Usinsky field is studied in the process of oil temperature control in contact with an extract of urobacteria added to a 5% solution of an oil-displacing composition containing urea - 28.6, ammonium nitrate - 12.4, APA (sulfanol) - 2.4 and nonionic surfactants (AF 9-12) - 4.8 g / l. To do this, 100 ml of a 5% solution of the composition are added to a thermostatic cell, 20 ml / l of urobacteria extract is added containing 840 million cells / ml, obtained with a dung: water ratio of 10: 100 and stirring for 120 minutes and 10 ml of the test oil. Thermostating is carried out for 60 days at a temperature of 40 ° C, close to the reservoir. The oil viscosity decreases after temperature control by 1.8 times. The results of the study are shown in table 4.

Thus, the present invention allows to reduce the viscosity of oil by 1.3-1.8 times without the use of heat and steam due to the products of urea hydrolysis when an environmentally friendly urobacteria extract with high urease activity is introduced into the oil reservoir at the same time as the oil-displacing composition containing surfactant and urea.

Table 1 Conditions for obtaining an aqueous extract of urobacteria from dung Sample number The concentration of dung in water,% PH change during the experiment The number of extracted urobacteria, million cells / ml 1 day 10 days 30 days Mixing time 30 minutes one 3 7.7 7.9 7.9 120-200 2 6 7.7 8.0 8.0 200-250 3 10 7.8 8.0 8.1 300-360 Mixing time 60 minutes four 3 8.0 8.2 8.2 380-420 5 6 7.9 8.1 8.1 450-480 6 10 8.1 8.2 8.2 480-520 Mixing time 120 minutes one 3 8.0 8.1 8.2 700-730 8 6 7.7 8.2 8.2 750-800 9 10 8.1 8.2 8.3 800-840

table 2 Hydrolysis of urea in the composition of oil-displacing compositions of different concentrations containing different surfactants with the addition of an extract of urobacteria At-
measures Structure Component concentration
tov, g / l The number of cells in the extract, million cells / ml The volume of extract ml PH change during hydrolysis Ref. 2 hours 1 day 5 days 10 days 20 days 50% solution of the composition one Urea 286 Ammonium nitrate 142 APAW (Volgonate) 24 Nonionic surfactants (AF 9-12) 48 6.4 7.6 7.9 8.0 8.2 8.4 Water ml 500 Aqueous extract of urobacteria (dung: water 10: 100) 800 twenty 2 Urea 286 Ammonium nitrate 142 APAA (sulfonol) 24 Nonionic surfactants (AF 9-12) 48 6.4 7.6 7.9 8.0 8.2 8.6 Water ml 500 Aqueous extract of urobacteria (dung: water 10: 100) 820 fifty 3 Urea 286 6.4 7.6 7.9 8.0 8.2 8.8 ammonium nitrate 142 APAA (sulfonol) 24 Nonionic surfactants (NP-40) 48 Water ml 500 Aqueous extract of urobacteria (dung: water 10: 100) 830 40 four Urea 286 Ammonium nitrate 142 APAW (Volgonate) 24 Nonionic surfactants (NP-50) 48 6.4 7.6 7.9 8.0 8.2 8.6 Water ml 500 Aqueous extract of urobacteria (dung: water 10: 100) 840 thirty

Continuation of table 2 At-
measures Structure The concentration of components, g / l The number of cells in the extract, million cells / ml The volume of extract ml PH change during hydrolysis Ref. 2 hours 1 day 5 days 10 days 20 days 25% solution of the composition 5 Urea 143 Ammonium nitrate 71 APAW (Volgonate) 12 Nonionic surfactants (AF 9-12) 24 6.4 7.6 7.9 8.0 8.2 8.8 Water ml 750 Water extract of urobacteria dung: water 10: 100) 800 twenty 6 Urea 143 Ammonium nitrate 71 APAW (Volgonate) 12 Nonionic surfactants (NP-40) 24 6.4 7.6 7.9 8.0 8.2 8.8 Water ml 750 Water extract of urobacteria dung: water 10: 100) 820 thirty 7 Urea 143 6.4 7.6 7.9 8.0 8.2 8.4 Ammonium nitrate 71 AAS (sulfanol) 12 Nonionic surfactants (AF 9-12) 24 Water ml 750 Water urobacterium extract 840 fifty dung: water 10: 100) 8 Urea 143 Ammonium nitrate 71 APAV 12 (sulfonol) 6.4 7.6 7.9 8.0 8.2 8.6 Nonionic surfactants (NP-50) 24 Water ml 750 Aqueous extract of urobacteria (dung: water 10: 100) 830 40

Continuation of table 2 At-
measures Structure Concentra-
component
tov, g / l The number of cells in the extract, million cells / ml The volume of extract ml PH change during hydrolysis Ref. 2 hours 1 day 5 days 10 days 20 days 10% solution of the composition 9 Urea 57.2 Ammonium nitrate 28.4 APAW (Volgonate) 4.8 Nonionic surfactants (AF 9-12) 9.6 6.4 9.0 9.2 9.4 9.6 9.6 Water ml 900 Water extract of urobacteria dung: water 10: 100) 840 twenty 10 Urea 57.2 Ammonium nitrate 28.4 APAV volgonat) 4.8 Nonionic surfactants (NP-40) 9.6 6.4 9.0 9.2 9.4 9.6 9.6 Water ml 900 Water extract of urobacteria dung: water 10: 100) 830 fifty eleven Urea 57.2 6.4 9.0 9.2 9.4 9.6 9.6 Ammonium nitrate 28.4 APAA (sulfonol) 4.8 Nonionic surfactants (AF 9-12) 9.6 Water ml 900 Water urobacterium extract 800 thirty dung: water 10: 100) 12 Urea 57.2 Ammonium nitrate 28.4 APAV 4.8 (sulfonol) Nonionic surfactants (NP-50) 9.6 6.4 9.0 9.2 9.4 9.6 9.6 Water ml 900 Water urobacterium extract 820 40 (dung: water 10: 100)

Continuation of table 2 At-
measures Structure Concentra-
component
tov, g / l The number of cells in the extract, million cells / ml The volume of extract ml PH change during hydrolysis Ref. 2 hours 1 day 5 days 10 days 20 days 5% solution of the composition 13 Urea 28.6 Ammonium nitrate 12.4 APAW (Volgonate) 2.4 Nonionic surfactants (AF 9-12) 4.8 6.4 9.0 9.3 9.6 9.6 9.6 Water ml 950 Aqueous extract of urobacteria (dung: water 10: 100) 840 twenty fourteen Urea 28.6 Ammonium nitrate 12.4 APAW (Volgonate) 2.4 Nonionic surfactants (NP-40) 4.8 Water ml 950 6.4 9.0 9.3 9.6 9.6 9.4 Aqueous extract of urobacteria (dung: water 10: 100) 800 fifty fifteen Urea 28.6 6.4 9.0 9.3 9.6 9.6 9.6 Ammonium nitrate 12.4 APAA (sulfonol) 2.4 Nonionic surfactants (AF 9-12) 4.8 Water ml 950 Aqueous extract of urobacteria (dung: water 10: 100) 820 thirty 16 Urea 28.6 Ammonium nitrate 12.4 APAA (sulfonol) 2.4 Nonionic surfactants (NP-50) 4.8 6.4 9.0 9.3 9.6 9.6 9.6 Water ml 950 Aqueous extract of urobacteria (dung: water 10: 100) 830 40

Table 3 The parameters of the enzymatic hydrolysis of urea in the composition of a 10% solution of the composition The investigated parameters The time of the experiment, days ref. one four 10 25 The number of microorganisms, million cells / ml 60 one hundred 450 840 800 Urea concentration, g / l 57.2 13.3 0.53 0.28 0.07 Urea utilization,% - 76.8 99.1 99.5 99.9 The concentration of NH ₄ ⁺ , g / l 6.9 7.7 20.3 22.0 28.5 The concentration of CO ₂ , l / l 0 0.37 5.04 12.17 22.6 pH 6.4 9.3 9.6 9.6 9.6

Table 4 The influence of the products of enzymatic hydrolysis of urea in the composition of the oil-displacing composition on the change in the viscosity of oil At-
measures Concentra-
Composition
% Nonionic surfactants Change of parameters during hydrolysis pH oil density, kg / m ³ at 20 ° С oil viscosity, MPa · s at 20 ° С before after before after before after Tamsagbulag Oil Field, Mongolia eighteen fifty sulfanol / NP-40 6.4 8.8 0.847 0.847 2180 1677 19 10 Volgonate / AF 9-12 6.4 9.6 0.847 0.845 2180 1453 Usinsk oil twenty 25 Volgonate / NP-5 0 6.4 9.0 0.965 0.955 12800 8000 21 5 sulfanol / AF 9-12 6.4 9.6 0.965 0.955 12800 7110

Claims (1)

A composition for reducing oil viscosity in low-temperature fields based on an oil-displacing composition containing ammonium nitrate, a surfactant - surfactant, urea and water, characterized in that an aqueous urobacteria extract containing 800-840 million cells / ml is added to the composition obtained with constant stirring for 120 min the mass of dung in water in a ratio of 10: 100, respectively, with the following ratios of components, g / l:
Ammonium nitrate 14-142 Nonionic surfactant - AF _9-12 or NP-40 or NP-50 4.8-48 Anionactive surfactant - volgonate or sulfonol 2,4-24 Urea 28.6-286 An aqueous extract of urobacteria containing 800-840 million cells / ml, obtained with constant stirring for 120 min in the ratio dung: water 10: 100 20-50 ml / l Water the rest is up to 1 liter

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