RU2232878C2 - Formation face zone processing compound - Google Patents

Abstract

FIELD: oil industry, in particular, isolation of wells from influx water and regulation of oil deposit working process.

SUBSTANCE: face zone processing compound includes, wt%: oil-soluble surfactant 1.0-15.0; silicone or soluble or colloid sodium silicate 0.5-18.0; Polysil 0.1-2.0; water the balance. Compound may further contain calcium chloride in an amount of 1.0-10.0 wt% and hydrocarbon solvent in an amount of 2.0-15.0 wt%. Compound possesses increased structural viscosity and thermal stability, improved adhesion to rock to provide for reduced permeability of heavily flooded intercalation and increased hydrophobicity of rock surface. Specific hydrocarbon phase permeability of formation is increased as compared to water permeability owing to high oil displacing properties of compound.

EFFECT: increased structural viscosity and thermal stability of compound, regulated wettability and improved adhesion to rock and, accordingly, reduced permeability of heavily flooded intercalation.

3 cl, 5 tbl, 5 ex

Description

The invention relates to the oil industry, in particular to compositions for treating the bottomhole formation zone, and can also be used to isolate the flow of water into the wells and to regulate the development of oil fields.

Known acidic surface-active composition for treating the bottom-hole zone of injection and production wells (RF patent No. 20133527, E 21 B 43 / 22.1994) containing neftenol-N 2-8 wt.%, Hydrochloric acid 92-98 wt.%.

When the components are mixed, an acidic surface-active system with a low structural viscosity is formed, the use of which is ineffective in deposits with high permeable rocks.

The known composition of the surface-active composition (AS USSR No. 1623278, E 21 B 43/22, 1992), containing water-oil-soluble anionic surfactants, oil-soluble nonionic surfactants, hydrocarbon solvent and water.

The composition has a good oil-displacing ability, but has a low structural viscosity, therefore, does not create effective resistance to water in a porous medium.

A known composition containing liquid glass with ammonium bicarbonate (US patent No. 207759, 1940), as well as a composition in which the polymerization of potassium silicate is caused by salts such as chlorides and sulfates of potassium and lithium (US patent No. 2392767, 1946).

These compositions have a significant drawback - poor filterability in a porous medium due to the rapid formation of gel particles of polysilicic acid and, as a result, low efficiency in water isolation, a narrow field of application (on fractured formations).

A known composition containing 99.05-99.80 wt.% Alkyl ester of ortho-silicic acid and 0.2-0.95 wt.% Hydrochloric acid (US patent No. 2229177, CL 166-21, 01/21/1941). Hydrochloric acid catalyzes the hydrolytic polycondensation reaction, which results in the formation of a polysilicic acid gel.

A known composition containing oil-soluble organosilicon compounds: 75.0-99.9% tetraethoxylan and 0.1-25.0 wt.% Organochlorosilane (AS USSR No. 859612, E 21 In 43/22).

When the components of the composition come into contact with water in the formation, hydrolysis, sedimentation and (or) gel formation occurs, which blocks highly permeable formations.

A significant drawback of these compositions is poor filtration into the porous medium due to the rapid formation of gel particles of polysilicic acid and, as a result, its low efficiency and narrow scope and high consumption of expensive organosilicon substances.

A known composition containing 1-40 wt.% Hydrocarbon solvent and the rest of the water (and.with. No. 1623280, E 21 In 43/22, 1987).

This composition is a highly dispersed oil-in-water emulsion, which has low rheological and, therefore, insulating properties, and is not stable enough at high temperature.

The closest in technical essence and the achieved result is a composition for processing the bottom-hole zone of the formation, containing 0.5-10.0 wt.% Anion oil-soluble MPAS; 1.5-15.0 wt.% Water glass, the rest is water. The composition may additionally contain a hydrocarbon solvent in an amount of 2-10 wt.% (RF patent No. 2112871, E 21 B 43/22, 43/32, 10.06.98).

The technical result is an increase in structural viscosity and an increase in the thermal stability of the composition, as well as a change in wettability, namely, an increase in the hydrophobization of the composition and an improvement in its adhesion to the rock, which will ensure a decrease in the permeability of highly flooded layers and increase the hydrophobization of the rock surface, and due to the high oil displacing properties of the composition, the relative permeability reservoir for the hydrocarbon phase compared to the water.

The technical result is achieved by the fact that the composition for processing the bottom-hole zone of the formation, including the oil-soluble surfactant MPAW, a silicon-containing substance and water, which as a silicon-containing substance contains an organosilicon substance or soluble or colloidal sodium silicate and additionally Polysil in the following ratio of components, wt .%:

MPAV 1.0-15.0

organosilicon substance or

soluble or colloidal

sodium silicate 0.5-18.0

Polisil 0.1-2.0

water rest

The composition may additionally contain calcium chloride in an amount of 1.0-10.0 wt.%.

The composition may additionally contain a hydrocarbon solvent in an amount of 2.0-15.0 wt.%.

As surfactants used such surfactants such as neftenol H3 containing a hydrocarbon solution of esters of tall oil acids and triethanolamine; neonols AF ₉ 4-6 - nonionic nonylphenols, ethoxylated with 4-6 moles of hydroxyethylene; as well as petrochemicals 1, 3, containing complex mixtures of derivatives of carboxylic acids, light tall oil and piperizine salts of these acids in a solution of kerosene and reforming catalysis; oil-soluble petroleum sulfonates with MM = 600-700, synthetic alkylaryl sulfonates (e.g., alkylnaphthalene sulfonic acid), emulsifier Sinol EM 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 surfactants.

As organosilicon substances, water-soluble organosilicon emulsion KE 20-03 (TU 6-0505763441-96-93) is used - a 70 percent aqueous emulsion of polyethylsiloxane liquid PES-5 and a composition of ethoxysiloxanes (TU 6-00-05763441-45-92) under the name "product 119-296 T", and oil-soluble ethyl silicate - 40 ETS-40 (GOST 26371-84) - a homogeneous mixture of oligoethoxysiloxanes; a complex mixture of tetraethoxylan and oligoethoxysiloxanes - ethyl silicate - 32 ETS-32 (TU 6-02-895-86)); GKZh-11N hydrophobizing silicone fluid (TU 6-000491277-101-97) - an aqueous solution of sodium methylsiliconate; AKOR-B 100 polymer grouting material modified with titanium tetrachloride (TU 39-1331-88), organosilicon resins 139-297 - solutions of polyphenylsiloxane resin in orthoxylene (TU 6-02-1-026-90) and 134-276 c polymethylphenylsiloxane resin hydrocarbon solvent (TU 6 02-1360-87), oligoorganoethoxy- (chloro) siloxanes under the name "product 119-204" according to TU 6 02-1294-84.

Technical soluble sodium silicates include orthosilicate (Na ₄ SiO ₄ ), metasilicate (Na ₃ SiO ₂ ), disilicate (Na ₂ SiO ₂ ) and more siliceous products, the ratio of which is close to Na ₂ · 4SiO ₂ . One of the most common types of sodium silicate, such as soluble glass, contains oxides in a proportion of Na ₂ O · 3.3 SiO ₂ . This product, which is produced in the form of a viscous solution containing about 28% SiO ₂ , is used as a binder in water treatment, for the preparation of silica gel and other needs and is called liquid glass.

As silicates use a solution of high-modulus liquid glass "Silin-30" (TU 2145-002-13002578-93), colloidal sodium silicate brand "Sialit-30-5" (TU 2145-002-43811938-97), instant powder of hydrated silicate Sialit-60-3 sodium (TU 2145-004-43811938-99), a solution of low-modulus glass of the Silin-M brand or frost-resistant glass powder of the Nomak brand, (TU 2145-015-13002378-95) and other soluble silicates.

As Polysil, chemically modified silicas (SiO ₂ ) are used, which, depending on the modification method, can have hydrophobic (Polysil-GP), diphilic (Polysil-DF) and superphilic (Polysil-SF) properties.

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 -60- + 180 ° С, hydrophobicity - 99% (TU 2169-001-0470693-93).

Polysil-DF has the properties of solid non-ionic surfactants 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 is 0 °, the range of working temperatures is -60- + 180 ° C, the degree of hydrophobicity is 100% (TU 2311-002-04706-93).

Polysil-SF has superphilic organophobic properties, is a highly dispersed chemically modified powder based on silicon dioxide, 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 wetting angle for the surface treated with Polysil-SF 90-120 °, operating temperature range -60- + 180 ° C, degree of hydrophobicity - 40-50% (TU 2311-002-04706-93).

Modified dispersed materials of the Polisil brand 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 the fourth class of low-hazard in accordance with GOST 12.007-76 substances. Storage conditions Polysil: dry room at a temperature of -50 to + 50 ° С.

The mechanism of silicate gel formation was studied by a number of authors and described by the author R.K. Ayler "Colloidal chemistry of silica and silicates", Moscow, 1959 and is well represented in the closest analogue.

The prospectivity and high efficiency of using reverse emulsions for treating the bottom-hole formation zone has been proven by a number of laboratory studies and field treatments. This is due to a number of their positive qualities: firstly, the dispersed nature of the reverse emulsions allows them to be selectively filtered into the most permeable zones of the formation; secondly, the ability to thicken and structure during mechanical mixing with formation water during filtration into the depth of the formation and, conversely, to dilute when dispersed with oil, which ensures their high selectivity; thirdly, the presence in their composition of surfactants with high adhesion to the hydrophilic rock of the formation in water-washed zones gives them the ability to hydrophobize the collector’s skeleton, both when moving along the filtration channels and after decomposition, with an increase in its phase permeability to oil and a decrease for water.

In contrast to the closest analogue in which silicon-inorganic substance is used - silin-30 liquid glass, to improve the efficiency of using reverse emulsions, a composition for treating the bottom-hole zone of the formation is proposed, where both organosilicon and inorganic silicon soluble can be used as a silicon-containing component or colloidal sodium silicate, and as anionic surfactants can be used as anionic surfactants (neftenol-H3, petrochemical, etc.), so nonionic MPAS (neonol-AF9-4-6, etc.), silt and mixed type (Sinol EM - a mixture of anionic and nonionic MPAW, etc.).

As a result of the reaction of silicon-containing substances with electrolytes in the composition of the emulsions, a gel mass of polysilicic acids is formed, which increases the viscosity of the dispersed phase of the emulsions, and as a result, the stability of the emulsions at elevated temperatures and their rheological properties are improved.

With the introduction of the proposed composition of organosilicon substances, for example tetraethoxysilanes, into the emulsion, the hydrolysis reaction is accompanied by further condensation of the formed silanols with the formation of polyalkoxysiloxanes and ultimately silica.

The hydrolysis of tetraalkoxysilanes usually proceeds in the presence of catalysts - inorganic acids and alkalis. Many emulsifiers used include free tall oil acids; as a result of exchange reactions, the alkoxy group Si-OR is converted to the acylo group Si-OCOR. The hydrolysis rate of the acyloxy group is higher than that of the alkoxy group, and hydrolysis proceeds without a catalyst.

When soluble or colloidal sodium silicate is used in the proposed composition, it interacts with aqueous solutions of electrolytes included in the emulsion, monosilicic acid is formed, which is unstable and undergoes polymerization and polysilicic acids of various composition and structure are formed.

The macromolecules of silicon-containing polymers have great flexibility and small forces of intermolecular interaction. Such molecules form globular structures in the composition of the dispersed phase (water), while improving the rheological properties of emulsions. In addition, macromolecules of silicon-containing polymers adsorbed on the interface between water and oil form a gel-like film that has mechanical and chemical stability and stabilizes emulsions.

This leads to a decrease in interfacial tension, more efficient emulsification and increase of rheological properties, and also ensures the stability of emulsions at high temperature.

In addition, the silicon-containing polymer has a high hydrophobic activity and adhesion to the rock. Hard rock minerals in one form or another contain hydroxyl groups, for example, as part of crystalline hydrates of bound water. These hydroxyl groups of the rock actively interact with the hydroxyl groups of silicon-containing compounds. In this case, the chemical “crosslinking” of the silicon-containing compound with the rock provides very high adhesive characteristics of the silicon-containing polymer, and the orientation of hydrocarbon radicals inside the pore space contributes to the achievement of high hydrophobic activity.

After processing oil and water-saturated rocks with the proposed composition, due to the above properties, the phase permeability of the rock to oil significantly increases and decreases to water.

The proposed composition additionally contains a new component - chemically modified fine powder Polysil.

Depending on the brand Polysil, i.e. The method of modifying the surface of a finely dispersed material introduced into the composition changes the properties of the proposed composition, and after pumping the proposed composition, the filtration characteristics of the reservoirs for both water and oil change.

Due to the submicron particle size of the material used, 2-3 orders of magnitude smaller than the average pore size of the reservoir, Polysil easily penetrates into the bottom-hole zone of the formation, changing the surface energy (wettability) of the formation.

The proposed composition containing a hydrophobic modified additive Polysil-P1, largely hydrophobizes the surface of the rock, since their surface is modified by 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 proposed formulations may contain Polisil-DF. Due to the structure of the grafted surface layer, Polysil-DF has the properties of a solid nonionic surfactant.

The use of the Polysil-Polisil-DF brand with the properties of a solid nonionic surfactant in the proposed composition, due to the structure of the grafted surface layer, significantly reduces the surface tension at the water-rock-oil interface, increasing the phase permeability of the fluid as a result of its fixation in the pore volume due to its small size particles of it and due to the forces of adhesion.

The addition of Polysil-DF 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 particles of solid contaminants (AFS).

The proposed compositions may contain Polysil-SF, which has superphilic organophobic properties.

The addition of Polysil-SF to the proposed composition leads to the displacement of oil from weakly drained intervals, and also causes blockage of the aquifers as a result of an increase in the thickness of hydrated shells.

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

The proposed composition may additionally contain calcium chloride in an amount of 1.0-10.0 wt.%. The introduction of calcium chloride increases the viscosity, sedimentation stability of the emulsion, increases the insulating effect of the composition.

The presence of calcium chloride increases the stability of emulsions with increasing temperature. 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 calcium cations 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, an increase in the structural viscosity of the emulsion and its stabilization at elevated temperatures.

The proposed composition may contain a hydrocarbon solvent in an amount of 2.0-15.0 wt.%, Which uses low-viscosity oils, as well as stable gasoline, gas gasoline, hexane fraction (a mixture of saturated hydrocarbons Ce-Ce and above), diesel typically Nefras and other hydrocarbon solvents.

The introduction of oil or other hydrocarbons in the composition allows you to adjust the viscosity and stability of the emulsion compositions.

The proposed composition is prepared as follows. The calculated amount of silicon-containing substance is introduced into the calculated amount of MPAS with mechanical stirring, then the calculated amount of wastewater or an aqueous solution of calcium chloride is dosed in small portions, mixed thoroughly until a homogeneous water-in-oil emulsion is obtained.

The proposed composition may contain a liquid hydrocarbon, which is dosed in MPAW.

When used in the proposed composition of the modified material of different brands of Polysil: Polysil-P1 and Polysil-DF are dosed in MPAW, Polysil-SF is introduced into water or an aqueous solution of calcium chloride.

To determine the stability of the proposed emulsions at elevated temperatures and their rheological characteristics, laboratory studies were conducted that confirmed their high efficiency.

Particular importance is attached to the stability of emulsions, i.e. the ability of the composition to maintain its technological properties for a longer time.

The higher the stability of the emulsion, the longer it retains the uniformity and viscosity of the composition. During storage of the emulsion in a macrovolume at elevated temperature, its uniformity is violated with the separation of oil and water, i.e. emulsion breaking. Therefore, to study the stability of the emulsion in a porous medium at elevated temperatures, such studies were conducted.

One pore volume of the test emulsion containing a silicon-containing substance is pumped into the column prepared for filtration, after which the column is placed in an air oven with a temperature of 80 ° C. Three volumes of water are pumped through the column at intervals of one day and the stability of the emulsions is determined to reduce the permeability of K ₁ / K ₂ · 100%.

Studies have shown the ability of the proposed emulsions to maintain the initial technological properties in a porous medium at elevated temperatures (80 ° C) from 1.5 to 18 days. The results are presented in tables 1-5 (see stability, days at 80 ° C).

Example 1. Two emulsions are prepared according to the proposed composition: in 12.5 g of neftenol H3, 5 g of “product 119-204” and 1.0 g of Polysil are added with mechanical stirring, then 82.5 g of wastewater are dosed in small portions in the first emulsion, in the second 82.5 g of a 10% solution of calcium chloride, mixing thoroughly to obtain homogeneous emulsions. The prepared emulsion is filtered on a filtration plant in order to determine the decrease in permeability. For filtration, the prepared stainless steel columns 220 mm long and 32 mm inner diameter are filled with a mixture containing sandstones that are unevenly divided by interlayers of dense differences of silts and clays from the Bobrikovsky horizon deposit of the Visean tier of the Samara region. The models are saturated with water under vacuum, and the initial permeability of the cores in fresh water is determined in a weighted manner, which is 0.201-0.4539 μm ² (K ₁ ). Then, one pore volume of the proposed emulsions and three pore volumes of fresh water core are pumped through the column. Then determine the permeability to water (K2). The decrease in permeability in% is determined by the change in core permeability in water before and after emulsion pumping: K ₁ / K ₂ · 100%. The stability of the emulsions obtained is determined by the above method. The emulsions prepared above are stable for 7 and 12 days, respectively (see Tables 1 and 2, lines 7).

The results of filtration studies are presented in tables 1 and 2.

Example 2. Three emulsions are prepared according to the closest analogue: in 12.5 g of neftenol H3 each emulsion is added with mechanical stirring, respectively, 5, 10 and 15 g of silin-30 brand glass, then the calculated amount of wastewater is metered in small portions, carefully mixing until a homogeneous emulsion. The resulting emulsion is filtered on a filtration plant in order to determine the decrease in permeability (see Example 1). The stability of the emulsions obtained is determined by the above method. The emulsions prepared above are stable for 3, 5, 6, and 5 days, respectively (see Table 1, line 10). There are no data on the stability of emulsions at elevated temperatures in the closest analogue.

Example 3. The structural viscosity of the proposed emulsions and emulsions of the prototype is measured on a rotational viscometer of the type RPE-1M Polymer with sensing elements of the cylinder-to-cylinder type and an assessment of rheological properties by torque at 25, 40, 60, 80 ° C.

The measurement results are presented in table 3, which show that with the introduction of silicon-containing substances increases the viscosity and stability of emulsions at a temperature of from 25 to 80 ° C.

The thermal stability of the proposed emulsions and emulsions according to the closest analogue was determined by keeping the compositions in a macrovolume at 80 ° C in a heating cabinet for several days. At the same time, after each day the emulsions were aged, their viscosity was measured on a Hepler rheoviscimeter. The viscosity on a Hepler rheoviscimeter is determined by the time of immersion of the ball (t, s) under the action of the applied load (P, g / cm ² ), which is calculated by the formula M = kPt, where k is a constant by the formula. Thermostability of emulsions (TS) was evaluated by the following formula:

where Vo and Vt are the viscosity of the initial emulsion (at 20 ° С) and after holding it at the required temperature for a certain time.

The greater the thermal stability (TS), the higher the thermal stability of the composition. The results of the study of the thermal stability of emulsions after 3 days of exposure at 80 ° C are given in table 3.

From the data on the thermal stability of emulsions, it is seen that the introduction of silicon-containing substances sharply increases the thermal stability of the compositions (see table 3).

Example 4. Prepare two emulsions of the proposed composition: in 5 and 10 g of low-viscosity oil (8.5 mPa · s at 20 ° C and a density of 842 kg / m ³ ), 12.5 g of Neftenol H3 are metered, then added with mechanical stirring 5 g of "product 119-204" and 1.0 g of Polysil, then 77.5 g and 72.5 g of waste water are metered in small portions, the components are thoroughly mixed until a homogeneous emulsion is obtained. The emulsions obtained are filtered on a filtration plant in order to determine the decrease in permeability (see Example 1). The stability of the emulsions obtained is determined by the above method. Emulsions are stable for 9 and 10 days, respectively (see table 4, lines 8 and 9).

The filtering results of the proposed emulsions containing additional hydrocarbon are presented in table 4.

Example 5. The oil-displacing ability of emulsions is determined under conditions of additional washing out of residual oil on a linear model of a homogeneous reservoir, which is the above-described stainless steel column. The column is filled with the above mixture. The model is saturated with water under vacuum; the column permeability to water is determined by the weight method.

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.

The results of the filtration of emulsions to determine the oil displacing ability of the compositions are presented in table 5.

The research results showed that the optimal concentrations to obtain stable emulsions are: MPAW - 1.0-15.0 wt.%, Silicon-containing substances - 0.5-18.0 wt.%, Water - the rest.

When the content of the components of the emulsion: MPAW is less than 1.0 wt.%, Silicon-containing substances less than 0.5 wt.%, Unstable emulsions are formed, therefore these concentrations of the components are taken as the lower concentration limit.

When the content of the components of the emulsion: MPAW more than 15 wt.%, Silicon-containing substances more than 18 wt.%, Does not lead to a significant increase in the stability of emulsions at elevated temperatures, to a significant increase in the reduction of permeability of collectors and an increase in the displacement coefficient, therefore, use emulsions with a content of components above these concentrations impractical.

The proposed composition may contain calcium chloride in an amount of 1.0-10.0 wt.%, A hydrocarbon solvent in an amount of 2.0-15.0 wt.%, As well as a modified highly dispersed material Polysil of the above grades in an amount of 0.1-2, 0 wt.%.

The use of the proposed composition containing an oil-soluble surfactant and a silicon-containing substance and water, as well as the other above-mentioned components, will make it possible to obtain highly viscous and thermostable compositions, the injection of which will reduce the permeability of highly flooded layers, and due to the high oil-displacing properties of the composition and increase the hydrophobization of the rock surface, it will increase the relative permeability reservoir for the hydrocarbon phase compared to the water.

The application technology of the proposed composition is simple and consists in pumping them into the formation to reduce well injectivity by 30-50%, selling the composition from the wellbore to 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.

Claims (3)

1. The composition for processing the bottom-hole zone of the formation, including the oil-soluble surfactant MPAW, a silicon-containing substance and water, characterized in that as a silicon-containing substance it contains an organosilicon substance or soluble or colloidal sodium silicate and additionally Polysil in the following ratio of components, wt. %: MPAV 1.0 - 15.0 Organosilicon substance or soluble or colloidal sodium silicate 0.5 - 18.0 Polisil 0.1 - 2.0 Water Else 2. The composition according to claim 1, characterized in that it further comprises calcium chloride in an amount of 1.0-10.0 wt.%. 3. The composition according to claim 1, characterized in that it further comprises a hydrocarbon solvent in an amount of 2.0-15.0 wt.%.

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