RU2244809C2 - Oil recovery composition - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: invention is intended for use during development of oil pools at different waterflooding phase for intensifying functioning of producing wells and increasing current oil recovery of formation. Composition contains, wt %: liquid hydrocarbon 10.0-20.0, oil-soluble surfactant 0.3-5.0, water-soluble or water-oil-soluble surfactant 0.1-1.0, superfine hydrophobic material 0.1-2.0, and water (the rest). Composition may further contain 0.3-5.0% calcium chloride. Oil recovery is increased owing to hydrophobization of formation structure, reduction of surface tension in water/rock/oil phase boundary, increase in detergent power of polluted surface, increase in composition viscosity, and increase of relative permeability of the formation for hydrocarbon phase as compared with water phase.

EFFECT: increased oil recovery.

2 cl, 2 tbl, 2 ex

Description

The invention relates to oil production from the reservoir, in particular to compositions for oil recovery, and can be used in the development of oil fields at any stage of water flooding, to intensify the operation of production wells, increase the current oil recovery.

Known oil-displacing micellar mixture containing a hydrocarbon of 10-70 wt.%; surfactant 6-14 wt.%; alcohol 0.8-6.0 wt.% and water 10-80 wt.% (patent SU 1473721, Е 21 В 43/22, publ. 15.04.89., Bull. No. 14).

The specified oil-displacing mixture has good oil-displacing properties, however, it has a large consumption of surfactants and unstable composition.

A known composition for oil recovery, containing neonol AF ₉ -4 2.0-4.0 wt.%, Anionic water-soluble surfactant 6.0-12.0 wt.%; liquid hydrocarbon 10.8-30.0 wt.% and water 52.0-77.7 wt.% (and.with.SU No. 1668642, E 21 B 43/22, publ. 07.08.91, Bull. No. 29 )

This composition, having high oil-displacing properties, has a large consumption of surfactants, especially anionic surfactants, since when the composition in the formation with highly mineralized water exceeds 17 g / l, the surfactant may be salted out, which leads to a violation of the stability of the composition.

Known invert microemulsion for processing oil reservoirs containing 10.0-20.0 wt.% Liquid hydrocarbon, 0.3-5.0 wt.% Neftenol NS, 0.3-1.5 wt.% Calcium chloride and the rest ( Patent No. 2110675.6, E 21 B 43/22, publ. 05/10/98, Bull. No. 13).

However, the well-known microemulsion does not sufficiently reduce the surface tension at the water – rock – oil interface, and has insufficient washing action of the contaminated surface.

The closest in technical essence and the achieved result is a composition for oil recovery containing liquid hydrocarbon 10.0-20.0 wt.%, Oil-soluble surfactant neftenol NC 0.3-3.0 wt.%, Water-soluble surfactant GKZH-10 (GKZh -11) 0.1-1.0 wt.% And water - the rest. (RU 2065033, E 21 B 43/22, 08/10/1996).

As a water-soluble surfactant use GKZH-10 or GKZH-11-water-alcohol solutions of sodium alkylsiliconate, which are liquid from colorless to light brown in color, having a density at 20 ° C of 1.17-1.21 g / cm ³ and containing ethyl alcohol 12-18 wt.%.

Additive GKZH-10 or GKZH-11 enhances the hydrophobic properties of the composition of the prototype for 8 hours.

The objective of the proposed invention is to increase oil recovery by increasing the hydrophobization of the formation rock, reducing the surface tension at the water-rock-oil-oil interface and increasing the washing action of the contaminated surface, as well as increasing the viscosity of the composition and increasing the relative permeability of the formation for the hydrocarbon phase compared to the aqueous .

The problem is solved in that the proposed composition for the extraction of oil contains a liquid hydrocarbon, a mixture of surfactants and water, characterized in that it contains as a surfactant oil, water or water-soluble surfactants and additionally highly dispersed hydrophobic material in the following ratio of components, wt.%:

Liquid hydrocarbon 10.0-20.0

Oil soluble surfactant 1.0-5.0

Water soluble or

water-soluble surfactant 0.1-1.0

Fine

hydrophobic material 0.1-2.0

Water rest

The composition for oil recovery according to claim 1, characterized in that it further comprises calcium chloride in an amount of 0.3-5.0 wt.%.

Stable gasoline, hexane fraction (mixture of saturated hydrocarbons С ₆ -С ₈ and higher), gas condensate, gasoline, nefras, diesel fuel, as well as low-viscosity oils and other hydrocarbon solvents are used as a liquid hydrocarbon.

Neftenol NZ containing a hydrocarbon solution of tall oil acid esters of triethanolamine is used as an oil-soluble surfactant;

neonols AF ₉ 4-6 - nonionic nonylphenols oskietilirovany 4-6 moles of hydroxyethylene; and also a petrochemical containing complex mixtures of carboxylic acid derivatives, light tall oil and piperizine salts of these acids in a solution of kerosene and reforming catalysis; oil-soluble petroleum sulfonates with M.M. = 600-700, synthetic alkylaryl sulfonates (e.g., alkylnaphthalene sulfonic acid), a sinol-EM reagent containing a hydrocarbon solution of the reaction product of tall oil acids with triethanolamine and carbamide, alkyl chloride and alkyldimethylamine oxides, as well as other oil-soluble surfaces -active substances.

As the water-soluble nonionic surfactants are used neonol AF ₉ -12 - nonylphenol, oxyethylated 12 moles of ethylene oxide, or its shape fusible CHO-ST, as water-soluble anionic surfactants or as -alkilbenzolsulfonat vodomaslorastvorimogo surfactant - mixture of anionic and nonionic surfactants in a composition ml- 80 and ML-81B (winter version) and other water-soluble and water-oil-soluble surfactants.

As a finely dispersed material, finely dispersed finely dispersed materials of tetrafluoroethylene, silicon oxides, titanium, iron, chromium, zinc, aluminum, and polyvinyl alcohol are used, as well as finely dispersed polysilicon oxide materials.

Highly dispersed materials are chemically inert materials with an average individual particle size of 0.1 to 100 μm and a bulk density of 0.1 to 2.0 g / cm ³ , with wetting angles of 114 to 178 ° and a degree of hydrophobicity of 96, 0 to 99.99%. They do not have harmful effects on humans and the environment.

Chemically modified silicas (SiO ₂ ) are used as Polysil and, depending on the modification method, hydrophobic (Polysil-P1) and diphilic (Polysil-DF) are used.

Polysil is a trademark of chemically modified silicas (SiO ₂ ) (Trademark “Polysil”, certificate No. 199999 of December 6, 2000).

Polysil-P1 has strong hydrophobic and organophilic properties, is a fine powder based on silicon dioxide, chemically modified with an organosilicon compound, has a bulk density of 0.035-0.14 g / cm ³ , particle size 0.005-0.04 microns, specific surface area 300 m ² / g, effective contact angle for the surface treated with Polysil-P1 140-170 °, operating temperature range from -60 to + 180 ° С, hydrophobicity -99% (TU 2169-001-0470693-93).

Polysil-DF has the properties of a solid non-ionic surfactant due to the chemical structure of the grafted surface layer, has emulsifying properties, has a bulk density of 0.035-0.14 g / cm ³ , particle size 0.005-0.04 μm, specific surface area 300 m ² / g, effective the wetting angle for the surface treated with Polysil-DF 0 °, the range of operating temperatures from -60 to + 180 ° C, the degree of hydrophobicity -100% (TU 2311-002-04706-93).

Modified dispersed materials are chemically inert powders that do not have a harmful effect on humans and the environment, in accordance with the “Primary Toxicological and Hygienic Certificate of the New Compound”, approved by the Ministry of Health of the Russian Federation, this class of materials belongs to class 4 low hazard substances according to GOST 12.007-76. Storage conditions Polysil: dry room at a temperature of -50 to + 50 ° С.

Comparative analysis with the prototype allows us to conclude that the proposed composition differs from the known introduction of a new component - highly dispersed hydrophobic material.

In addition, the proposed composition may additionally contain calcium chloride in an amount of 0.3-5.0 wt.%.

After injection of the proposed composition containing a highly dispersed hydrophobic material, an increase in oil recovery is achieved by increasing the hydrophobization of the formation rock, reducing the surface tension at the water-rock-oil interface, and increasing the washing action of the contaminated surface, as well as increasing the viscosity of the composition and increasing the relative permeability of the formation for the hydrocarbon phase compared with the aqueous.

A highly dispersed hydrophobic material of the above modifications, introduced into the composition, having submicron particles, easily penetrates into the pores and microcracks of the formation, changes the surface energy (wettability). This qualitatively changes the filtration characteristics of the reservoir for both water and oil.

The proposed composition containing highly dispersed hydrophobic material with a degree of hydrophobicity from 96.0 to 99.99%, largely hydrophobizes the surface of the rock. Hydrophobization of the rock surface occurs as a result of the finely dispersed material being fixed in the pore volume due to its small particle size and due to adhesion forces, as well as by changing the wetting angle to 170-178 ° and lowering the surface tension.

After the proposed composition is injected, for example, clay particles are phobized into the clay-containing reservoir of the formation, resulting in a decrease in the thickness of the hydration shells surrounding the clay particles, which leads to an increase in the effective size of the pore channels and a decrease in the swelling of clay particles.

The proposed composition may contain modified material of the brand Polysil-DF. Due to the structure of the grafted surface layer, Polysil-DF has the properties of a solid nonionic surfactant.

As a result of fixing in the pore volume due to its small particle size and due to the adhesion forces, Polysil-DF significantly reduces the surface tension at the water-rock-oil interface, increasing the phase permeability of the fluid.

Adding Polisil-DF brand material to the proposed composition enhances the washing effect of contaminated surfaces and leads to the emulsification of grease and oil contaminants, dispersion and stabilization of particulate matter (AFS).

In contrast to the prototype, where as a component that enhances the hydrophobic properties of the composition, a water-alcohol solution GKZh-10 (GKZh-11) is used, which increases the hydrophobizing ability of the composition for 8 hours, the modified hydrophobic material of the above modifications introduced into the composition due to its high dispersion well fixed in the pore space and for an incomparably longer time increases the hydrophobic ability of the composition, since the hydrophobic material has a hydrophobicity of 96.0-99.99%, for example, in highly dispersed rsnom hydrophobic material Polisil marks P1-chemical modification of the silica surface produced an organosilicon compound of the general formula Cl _4-n SiR _n, where n = 1-3; R = H, methyl, ethyl, Cl-methyl, phenyl- followed by treatment with a compound selected from the group consisting of tetramethoxylan or tetraethoxylan or polymethylsilazane.

The use of the polysil-DF diphilic dispersed material significantly reduces the surface tension at the water – rock – oil interface and increases the washing effect of the emulsion.

The introduction of modified highly dispersed material of various grades and calcium chloride increases the viscosity, sedimentation stability, hydrophobic and surface-active properties of the emulsion and increases the insulating effect of the composition.

With an increase in the concentration of highly dispersed hydrophobic material introduced into the composition, its stabilizing effect increases, which makes it possible to obtain stable emulsions of higher viscosity.

The presence of calcium chloride increases the stability of emulsions with increasing temperature from 20 to 85 ° C. This effect is mainly affected through chemical transformations of the emulsifier in the composition of the emulsion and changes in the composition of the adsorption layers. The presence of metal cations (calcium) promotes the exchange reaction of the formation of metallic soaps of higher carboxylic acids present in the emulsifier, which leads to a sharp decrease in interfacial tension, more effective emulsification, stabilization of the emulsion and an increase in the structural viscosity of emulsions.

In addition, the oil-soluble and water-or water-soluble surfactants contained in the proposed composition increase its surface-active properties, when such a composition is pumped into watered oil wells, the formation rock surface changes its wettability, namely, it is hydrophobized due to the hydrophobic surfactant chains. With the joint hydrophobization of the surfactant rock surface and the modified hydrophobic material, the adhesion of the composition to the rock improves, which contributes to its better retention in the formation. Hydrophobization of the rock surface also leads to the removal of loosely bound formation water from previously not drained or weakly drained formation intervals and zones.

The proposed composition containing liquid hydrocarbon, oil- and water- or water-oil-soluble surfactants, highly dispersed hydrophobic material and water, by increasing the viscosity and hydrophobization of the composition and increasing the relative permeability of the formation for the hydrocarbon phase in comparison with the aqueous phase, will allow it to be used effectively to increase oil recovery.

The proposed composition is prepared as follows. In the calculated amount of a solution of an oil-soluble surfactant in a liquid hydrocarbon with mechanical stirring, the calculated amount of a hydrophobic material of the above grades is introduced and the calculated amount of a water- or water-oil-soluble surfactant in water or an aqueous solution of calcium chloride is metered in small portions, mixed thoroughly to obtain a homogeneous water-in-oil emulsion .

Example 1. An emulsion is prepared according to the proposed composition: 3.75 ml of an oil-soluble surfactant of Neftenol NZ is added in 10 ml of the hexane fraction with mechanical stirring, then 1 g of Polysil-P1 grade hydrophobic material is introduced in small portions and mixed thoroughly, then dosed in small portions of 85, 75 ml of a 0.5% aqueous solution of a water-soluble surfactant neonol AF ₉ -12 and stirred until a homogeneous emulsion.

The resulting emulsion is characterized by a density of 965 kg / m ³ and a dynamic viscosity of 18.2 MPa · s at 20 ° C.

The oil-displacing ability of the emulsion is determined under the conditions of residual oil washing out on a linear model of a homogeneous reservoir, which is a stainless steel column 220 mm long with an internal diameter of 32 mm. The column is filled with a mixture containing 95% silica sand and 5% montmorillonite clay. Of the three main types of clays - kaolinite, hydromica and montmorillonite - different in degree of swelling, montmorillonite was selected as the clay component of the model, as it has the highest ability to swell. The model is saturated with water under vacuum, and the porosity and permeability of the core in water is determined in a weighted manner.

After that, oil is injected into the model under pressure until clean (without water) oil appears at the outlet of it, and the initial oil saturation is determined. In the filtration works, natural oil is used with a density of 842 kg / m ³ and a dynamic viscosity of 8.5 MPa · s at 20 ° C. The initial displacement is carried out with water (three pore volumes) and the coefficient of oil displacement by water is determined. Then, one pore volume of the test emulsion and three pore volumes of water are filtered through the model, the growth and the total oil displacement coefficient are determined (see Table 1).

Example 2. Three pore volumes of water are pumped into a reservoir model with a water permeability of 1.98 μm ² and an initial oil saturation of 72.6%. The residual oil saturation after flooding is 25.3%, the oil displacement coefficient by water is 0.64. One pore volume of the emulsion of the following composition is filtered through the model, wt.%: Hexane fraction -10.0; MPAV neftenol H3 -1.5; Polysila-P1 -1.0; neonol AF ₉ -12 -0.5; 1% aqueous solution of calcium chloride - the rest. After the injection of one pore volume of the emulsion, three pore volumes of water are pumped and the residual oil saturation, which is 14.6%, is determined. The total oil displacement coefficient is 0.93, the growth of the displacement coefficient is 0.29 (see table 2).

Studies of the filtration characteristics of emulsions of various compositions and their dynamic viscosity are given in Tables 1 and 2.

Neftenol NZ is used as an oil-soluble surfactant in syntheses 1-4, 13-15 in Tables 1 and 2; in syntheses 5, 6, 16-17 use Neonol AF ₉ -4; in syntheses 7, 8, 18, 19, Neftekhim is used; in syntheses 9, 10, 20, 21 use petroleum sulfonate with M. M. = 700; in syntheses 11, 12, 22-27, Sinol-EM is used.

As the water-soluble surfactant in the synthesis of 1-4, 13, 14 in Tables 1 and 2 use Neonol AF ₉ -12; in syntheses 5, 6, 15-17, CHO-ST is used; ML-80 is used as water-oil-soluble surfactant in syntheses 7, 8, 18, 19, and sulfanol (alkylbenzenesulfonate) is used as water-soluble anionic surfactant in syntheses 9, 10, 20, 21; ML-81B is used as a water-oil-soluble surfactant in syntheses 11, 12, 22-27.

As surface modified highly dispersed hydrophobic material in syntheses 1, 7, 10 in tables 1 and 2, tetrafluoroethylene is used, in syntheses 2, 14 and 17 titanium dioxide is used, in syntheses 11,13 and 16 they are used, 49 silicon dioxide grade aerosil, iron syntheses are used in syntheses 3 and 18, Polysil-P1 is used in syntheses 4, 15, 19 and 22, polyvinyl alcohol is used in syntheses 5 and 20, chromium oxide is used in syntheses 6, 21 and 23, oxide is used in syntheses 7 and 27 aluminum, in syntheses 8 and 24 use zinc oxide, in syntheses 9,12 25 and 26 use Polysil-DF.

The results of measurements of dynamic viscosity show that with the introduction of a highly dispersed hydrophobic material, the viscosity of the emulsion increases by 1.3-2.0 times (see Tables 1 and 2).

The research results showed that the optimal concentrations to obtain stable emulsions are: liquid hydrocarbon -10-20 wt.%; oil soluble surfactant -1.0-5.0 wt.%; water-soluble or water-soluble surfactant -0.1-1.0 wt.%; fine hydrophobic material -0.1-2.0 wt.%; water - the rest.

The proposed composition may contain calcium chloride in an amount of 0.3-5.0 wt.%.

When the content of the components of the emulsion: liquid hydrocarbon less than 10.0 wt.%; oil-soluble surfactant less than 1.0 wt.%; water-soluble or water-soluble surfactant less than 0.1 wt.%; highly dispersed hydrophobic material of less than 0.1 wt.% unstable emulsions are formed, therefore, these concentrations are taken as the lower concentration limit.

When the content of the components of the emulsion: liquid hydrocarbon more than 20.0 wt.%; oil-soluble surfactant more than 5.0 wt.%; water-soluble or water-soluble surfactant more than 1.0 wt.%; highly dispersed hydrophobic material of more than 2.0 wt.% does not lead to a significant increase in the displacement coefficient, therefore, it is impractical to use compositions with a content of components above these concentrations.

The use of the inventive composition will increase oil recovery by increasing the hydrophobization of the formation rock and lowering the surface tension at the water-rock-oil-oil interface and increasing the washing action of the contaminated surface, as well as increasing the viscosity of the composition and increasing the relative permeability of the formation for the hydrocarbon phase compared to the aqueous .

The technology of using the inventive composition is simple and consists in pumping them into the formation to reduce well injectivity by 30-50%, selling the composition from the wellbore into the formation with water or oil, holding in the formation for 12-24 hours and putting the well into operation for oil wells or injection of water for injection wells.

Table 1.
Oil-displacing ability of the proposed compositions and prototype compositions Example The content of components, wt.% Dynamic viscosity, MPa.s at Initial oil saturation,% Oil displacement coefficient Liquid Carbohydrate Oil Soluble Surfactant Water or v / m rast. Surfactant High / dis.hydrophobic mater. Water 20 ° C 80 ° C on water growth common 1 2 3 4 5 6 7 8 nine 10 eleven 12 Prototype 10.0 10.0 15.0 20.0 0.3
1,0
1,5
3.0 0.1
0.3
0.5
1,0 - 89.6 88.7 83.0 76.0 14.0 13.4 10.5
6.8 20.8 19.7 18.7 21.2 68.5
64.0
78,2
73.5 0.71 0.58 0.65 0.69 0.15 0.18 0.20 0.19 0.87 0.75 0.85 0.88 Suggested composition 1 10.0 1,0 0.1 0.1 88.8 15.3 22.5 73.6 0.71 0.16 0.87 2 10.0 1,5 0.5 1,0 87.0 18.2 27.8 70.8 0.64 0.28 0.92 3 10.0 3.0 0.8 1,5 84.7 16.5 30,2 75.8 0.64 0.29 0.93 4 10.0 5,0 1,0 2.0 82.0 13,4 35.3 78.3 0.64 0.30 0.94 5 15.0 1,0 0.1 0.1 83.8 13.1 23.1 68.5 0.65 0.23 0.88 6 15.0 1,5 0.5 1,0 82.0 18.3 26.6 71.3 0.65 0.28 0.93 7 15.0 3.0 0.8 1,5 79.7 14.5 33,2 73.7 0.65 0.30 0.95 8 15.0 5,0 1,0 2.0 77.0 12.8 29.3 71.2 0.65 0.32 0.97 nine 20,0 1,0 0.1 0.1 78.8 10.6 21.8 72.9 0.63 0.25 0.88 10 20,0 1,5 0.5 1,0 77.0 14..5 24.5 75,2 0.63 0.30 0.93 eleven 20,0 3.0 0.8 1,5 74.7 11.7 26.8 78.1 0.65 0.31 0.96 12 20,0 5,0 1,0 2.0 72.0 9.8 21.3 76.0 0.66 0.28 0.94 Test cases thirteen 5,0 0.3 0.1 0.05 94.55 The emulsion is not stable 14 5,0 1,0 0.1 0.1 93.8 16.8 21.3 69.7 0.66 0.08 0.76 fifteen 5,0 5,0 1,0 2,5 86.5 15.1 34.6 72.1 0.59 0.12 0.71 16 10.0 0.3 0.1 0.05 89.55 The emulsion is not stable Continuation of Table 1. 1 2 3 4 5 6 7 8 nine 10 eleven 12 17 10.0 0.3 1,0 2.0 86.7 The emulsion is not stable eighteen 10.0 1,0 1,0 2.0 86.0 16.3 24.2 68.3 0.70 0.18 0.88 19 10.0 6.0 1.2 2,5 80.3 13.8 38.8 73.6 0.63 0.30 0.93 twenty 15.0 0.3 0.1 0.1 84.5 The emulsion is not stable 21 15.0 5,0 1,0 2,5 76.5 13,2 35.7 68,2 0.66 0.30 0.96 22 20,0 0.3 0.1 0.1 79.5 The emulsion is not stable 23 20,0 5,0 1,0 2.0 72.0 10.6 29.5 65,4 0.65 0.28 0.93 24 20,0 6.0 1,2 2,5 70.3 9.2 28,4 78.3 0.66 0.26 0.92 25 25.0 0.3 0.1 0.1 74.5 The emulsion is not stable 26 25.0 5,0 1,0 2.0 67.0 6.6 24.1 75.3 0.65 0.28 0.93 27 25.0 6.0 1,2 2,5 65.3 5.3 23.8 73,2 0.68 0.22 0.90

Table 2.
Oil-displacing ability of the proposed compositions and prototype compositions (the proposed compositions contain Polysil: compositions 1-4 and 9-16 -Polisil-P1, compositions 5-8 -Polisil-SF). Example The content of components, wt.% Dynamic viscosity, MPa · s at Initial oil saturation,% Oil displacement coefficient Liquid hydrocarbon Oil Soluble Surfactant Water growth. or in / m surfactant Hight / Dis. hydrophobic mater. CaCl ₂ Water 20 ° C 80 ° C on water growth common 1 2 3 4 5 6 7 8 nine 10 eleven 12 thirteen Prototype 10.0 10.0 15.0 20.0 0.3 1.0 1.5 3.0 0.1 0.3 0.5 1.0 - - 89.6 88.7 83.0 76.0 14.0 13.4 10.5 6.8 20.8 19.7 18.7 21.2 68.5 64.0 78.2 73.5 0.71 0.58 0.65 0.69 0.16 0.18 0.22 0.19 0.87 0.75 0.87 0.88 Suggested composition 1 10.0 1,0 0.1 0.1 0.3 88.5 17.3 23.5 70.6 0.70 0.18 0.88 2 10.0 1,5 0.5 1,0 1,0 86.0 21,4 27.8 72.6 0.64 0.29 0.93 3 10.0 3.0 1.0 1,5 3.0 81.5 18.3 28.6 71.7 0.65 0.30 0.95 4 10.0 5,0 1,0 2.0 5,0 77.0 15.4 36.0 68.3 0.64 0.32 0.96 5 15.0 1,0 0.1 0.1 0.3 83.5 13.6 25.3 78.5 0.67 0.23 0.90 6 15.0 1,5 0.5 1,0 1,0 81.0 19.3 28.6 73.3 0.69 0.25 0.94 7 15.0 3.0 1.0 1.5 3.0 66.5 16,4 34.5 70.7 0.67 0.30 0.97 8 15.0 5,0 1,0 2.0 5,0 73.0 14.8 29.7 66.5 0.66 0.32 0.98 nine 20,0 1,0 0.1 0.1 0.3 78.5 12.6 22.5 72.5 0.60 0.28 0.88 10 20,0 1.5 0.5 1,0 1,0 76.0 15,5 31,2 72.3 0.65 0.30 0.95 eleven 20,0 3.0 1,0 1,5 3.0 71.5 13.7 23.7 75.4 0.65 0.31 0.96 12 20,0 5,0 1.0 2.0 5,0 67.0 11.5 24.4 73.0 0.65 0.30 0.95 Test cases thirteen 5.0 0.3 0.1 0.1 0.3 94.2 The emulsion is not stable 14 5,0 1,0 0.1 0.1 0.3 93.5 18.5 23.5 67.7 0.67 0.11 0.78 fifteen 5,0 5,0 1,0 2,5 6.0 80.5 16.3 36.3 70.1 0.68 0.15 0.83 16 10.0 0.3 0.1 0.1 0.3 89.2 The emulsion is not stable Continuation of Table 2. 1 2 3 4 5 6 7 8 nine 10 eleven 12 thirteen 17 10.0 0.3 1,0 2,5 5,0 81.2 The emulsion is not stable eighteen 10.0 1,0 1,0 2.0 5,0 81.0 18.5 25.1 71.6 0.70 0.20 0.90 19 10.0 6.0 1,0 2,5 6.0 74.5 14.6 38.5 73.5 0.70 0.26 0.96 twenty 15.0 0.3 0.1 0.1 0.3 84.5 The emulsion is not stable 21 15.0 5,0 1,0 2,5 5,0 71.5 13,4 36.9 68,2 0.66 0.30 0.96 22 20,0 0.3 0.1 0.1 0.3 79.2 The emulsion is not stable 23 20.0 5,0 1,0 2.0 5,0 67.0 12.5 30.3 65.4 0.65 0.28 0.93 24 20,0 6.0 1,2 2,5 6.0 64.3 10.8 34,4 68.6 0.66 0.28 0.94 25 25.0 0.3 0.1 0.1 0.3 74,2 The emulsion is not stable 26 25.0 5,0 1,0 2.0 5,0 62.0 9,4 24.2 75.3 0.66 0.28 0.94 27 25.0 6.0 1,2 2,5 6.0 59.3 6.2 25,4 70.5 0.66 0.26 0.92

Claims (2)

1. The composition for oil recovery containing liquid hydrocarbon, a mixture of surfactants and water, characterized in that it contains as a surfactant oil, water or water-soluble surfactants and additionally highly dispersed hydrophobic material in the following ratio of components, wt.%: Liquid hydrocarbon 10.0-20.0 Oil Soluble Surfactant 1.0-5.0 Water-soluble or water-soluble surfactant 0.1-1.0 Fine hydrophobic material 0.1-2.0 Water Rest 2. The composition for extracting oil according to claim 1, characterized in that it further comprises calcium chloride in an amount of 0.3-5.0 wt.%.