RU2710943C1 - Dry mixture for preparing expanding grouting mortar - Google Patents

Abstract

FIELD: oil industry.SUBSTANCE: invention relates to oil and gas industry, in particular, to dry mixtures for preparation of expanding grouting mortar used in well cementing. Dry mixture for preparing expanding grouting mortar contains portland cement, ultra-cement, sodium boron hydride commercial-grade, sulfacell, additive for concrete and mortar of polyfunctional action "PFM-NLK", Policem Defom, additive for reduction of water-gas permeability of cement stone by Policem Gazblock, and polypropylene fiber with fiber length of 6–8 mm, diameter of 18 mcm at following ratio of ingredients, wt%: portland cement 78.40–81.85, Ultracement 9.09–19.77, sodium boron hydride commercial-grade 1–7, sulfacell 0.3–0.5, additive "PFM-NLK" 0.3–0.5, Policem Defom 0.1–0.5, Policem Gazblok 0.1–0.5, polypropylene fiber with fiber length of 6–8 mm, diameter of 18 mcm 0.03–0.06.EFFECT: higher quality of cementing of casing strings due to increased strength of adhesion of cement stone to casing string and rock, which prevents leakage of columns and inter-formation overflows during operation, production of non-caking, non-clumping, high stability dry mixture and expanding grouting mortar from said dry mixture with improved structural-rheological properties, high gas-blocking properties, providing formation of cement stone with high strength and obtaining a close contact of cement with rock and casing by increasing the intensity of action of expanding additive, expanded assortment of reagents, reduced time and simplified technology of preparing expanding grouting mortar; saving transport costs.1 cl, 2 tbl

Description

The invention relates to the oil and gas industry, in particular, to dry mixes for the preparation of expanding grouting mortar used in cementing wells.

Analysis of the current level of technology showed the following:

- known cement slurry in the following ratio of ingredients, wt. hours:

Cement 100 Hydroxyethyl cellulose 0.2-0.4 Plasticizer 0.1-0.5 Antifoam agent 0.2 Synthetic fiber diameter 0.001-0.1 1-20 mm long 0.1-1 Expanding additive 0,1-10 Water 49-51,

(see RF patent No. 2441897 dated 12/24/2010 under class C09K 8/467, publ. 02/10/2012).

As an expanding additive use: magnesium oxide (caustic magnesite, GOST 1216-87); gypsum - expanding alumina cement (mixture of alumina cement with gypsum, GOST 11052); RU reagent - an expanding additive, which is a mixture of modified calcium sulfates and aluminum (calcium sulfoaluminate), TU 2157-034-40912231-2005; reagent RU M grades A, B, C - expanding additive based on modified oxides of calcium, magnesium, aluminum and calcium and aluminum sulfates, TU 2458-059-40912231-2009; expanding additive based on calcium oxide - non-explosive destructive mixture NRS-1M, TU 5744-001-82475767-08, and similar in composition (expanding grouting additive DR-100, DR-50, DR-20, TU 5744-002-59758749 -06, lime mixture for mining SIGB, TU 5744-0 02-00282369-00). As a plasticizer, dry sulfonated melamine formaldehyde is used (Cemplast MF grade A, TU 2223-011-40912231-2003, Peramin SMF-10, imp.). An antifoam agent is an organosilicon composition on a silicon dioxide substrate (Police DF, TU 2228-010-40912231-2003, Axilat DF770DD, imp). This water-based cement slurry is prepared on the basis of dry reagents.

The disadvantages are the following. During long-term storage of cement, which is part of the mixture, the cement particles are compressed under the pressure of its upper layers, resulting in a strong adhesion of its particles to each other with the formation of a monolithic mass. Thus, the mixture loses its ability to flow during storage and transportation and has a tendency to caking and clumping, which makes it not technologically advanced. The reagents used as an expanding additive provide an improvement in the adhesive properties of cement stone (see table 3 of the patent description). However, they do not have gas generating ability and do not lead to linear expansion, which when cementing wells with a large gas factor can lead to micro-gaps and a violation of the insulating properties of cement stone. As a result, the necessary efficiency of the work will not be ensured: sulfonated melamine formaldehyde is a toxic substance due to the presence of free formaldehyde in it, which has a second hazard class according to GOST 12.1007 and GOST 12.1.005;

- well-known cementing material for cementing wells with a large gas factor, in the following ratio of ingredients, wt. hours:

while the total mass content of the dry mixture of cement and expanding additives is 100 wt. o'clock, and the mass ratio of the modified copolymer of vinyl acetate GAZBLOK and expanding additives in the material is 1: (2.5 ÷ 5.0), respectively, (see RF patent No. 2447123 of 03/18/2011, class C09K 8/46, ЕВВ 33/138, published on April 10, 2012).

Grouting material as a plasticizer, the active active principle of which is sulfonated melamine formaldehyde, contains the substance ZEMPLAST MF. The grouting material as a plasticizer, the active active ingredient of which is the product of condensation of naphthalene sulfonic acid and formaldehyde, contains substance C 3. The grouting material as a plasticizer, the active principle of which is polyester carboxylates, contains Melflux.

The disadvantages are the following. As an expanding additive, calcium oxide is used. However, the high hydration rate of the starting material leads to the formation of hydroxides in the mobile cement dough and eliminates the necessary expansion of the cement stone.

Cements of sulfoaluminate expansion are mostly quick setting. Cements containing calcium hydrosulfoaluminate are destroyed at temperatures above 100 ° C due to low heat resistance. The use of liquid reagents significantly complicates the process of preparing the solution at low temperatures; crystallization of polyvinyl acetate acetate dispersion occurs.

- known grouting material in the following ratio, wt. %: Portland cement - 50-70; silica-containing component, including tripoli and quartz sand in a ratio of 1:10 - 30-50; basalt fiber with a fiber length of 3 mm - 0.2-0.3 in excess of 100%; plasticizer Polyplast SP-1 - 0.1-1.0 in excess of 100%; calcium chloride - 0.1-3.0 in excess of 100%; CaO-based expanding additive - 3.0-5.0 in excess of 100% (see RF patent No. 2530805 of June 21, 2013 according to class C09K 8/467, EV 33/138, publ. 10.10.2014.

The disadvantages of the cement material, which is a dry mixture is the following. The sedimentation of quartz sand particles in a cement mortar based on cement Portland cement causes significant changes in the properties of cement stone, which will be shrinkable, with reduced strength and gas permeability. Polyplast SP-1 additive is a mixture of sodium salts of polymethylene naphthalene sulfonic acids of various molecular weights, that is, it is a surfactant that can cause foaming of cement slurry upon mixing. As a result of this, the true density of the solution decreases, foaming is initiated, which in turn causes difficulties in its injection.

Despite satisfactory strength indicators, the high content of reinforcing additives in the mixture formulation (up to 0.3%), contributes to an increase in viscosity, which affects the hydrodynamic characteristics of the solution.

In addition, during prolonged storage, this mixture is unstable, can caking and clumping due to the joint use in the formulation of calcium chloride and a silica-containing component, including tripoli and quartz sand. Calcium chloride has a high hygroscopicity, due to which it is possible flooding, and, accordingly, clumping of the dry mixture.

The presence in the formulation of the accelerator setting time during the subsequent preparation of the grouting mortar increases the likelihood of premature thickening of the mortar and does not provide sufficient efficiency of the work. According to the experimental data, water separation is 1.0-4.0 ml (description table 2). A cement slurry containing these ingredients has a high water demand and requires a significant water content to obtain the necessary mobility, whereby the cement slurry is subject to sedimentation precipitation, which contributes to low tamping ability. The latter will not provide the necessary gas blocking properties of the cement slurry prepared from the mixture and the necessary insulating ability of cement stone, its strong adhesion to the column and the walls of the wells.

The use of CaO as an expanding additive leads to linear expansion, but has the following limitations. When CaO is quenched, its particles are dispersed, as a result of which their specific surface area significantly increases. This leads to the binding of free water in the grout and a decrease in its mobility. Structural and rheological parameters of the solution increase, which affects the process of cementing wells, and, ultimately, the quality of its lining decreases. In addition, the CaO hydration process basically ends before the formation of cement stone, that is, the expansion energy does not lead to an increase in internal stresses, but only contributes to the spread of unbound hardening products, and as a result, the volume of cement-water suspension increases. In this regard, the density of contact of cement stone with adjacent media does not increase.

The use of Portland cement PCT-1-50 limits the scope of application of the dry mix in the range of 0-50 ° C. If this brand of Portland cement is used in conditions above 50 ° C, the casing cementing process may be violated due to the premature start of the setting time of the cement slurry and a complete or partial loss of its mobility.

The technical task is to improve the quality of cementing of casing strings due to an increase in the adhesion strength of cement stone to the casing string and rock, which prevents leak-tightness of the strings and interstratal flows during well operation.

The technical result that can be obtained by implementing the invention:

- obtaining a non-caking, non-lumping, highly stable dry mix and expanding grouting mortar from the specified dry mix with improved structural and rheological properties, high gas blocking properties, providing the formation of cement stone with increased strength and obtaining tight contact of cement with the rock and casing by increasing the intensity of the expanding supplement;

- expansion of the assortment of reagents;

- reducing time and simplifying the technology of preparation of expanding cement slurry;

- saving transportation costs.

The technical result is achieved using the proposed dry mix for the preparation of an expanding cement slurry containing Portland cement, Ultracement, technical sodium borohydride, Sulfacell, an additive for concrete and mortar of multifunctional action "PFM-NLK" (additive "PFM-NLK"), Police Def, an additive to reduce the water-gas permeability of cement stone by Police Gazblok (Police Gazblok) and polypropylene fiber with a fiber length of 6-8 mm, diameter 18 microns in the following ratio of ingredients, wt. %:

Portland cement 78.40-81.85 Ultracement 9.09-19.77 Sodium borohydride technical 1-7 Sulfacell 0.3-0.5 Additive "PFM-NLK" 0.3-0.5 Police Def 0.1-0.5 Police Gazblok 0.1-0.5 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.03-0.06.

The inventive dry mixture meets the condition of "novelty."

To prepare the dry mixture use: Portland cement according to GOST 1581-96, Micronized cement - Ultracement according to TU 5739-019-56864391-2010, technical sodium borohydride according to TU 1-92-162-90, Sulfacell according to TU 2231-013-32957739-2001 manufactured by ZAO Polycell, Vladimir, which is hydroxycellulose, an additive for concrete and multifunctional mortar PFM-NLK according to TU 5745-022-58042865-2007 in the form of a powder, consisting of surface-active sodium salts of polymethylene naphthalene sulfonic acids, air-entraining and hydrophobizing component nta. The main components that make up the additive: methylene bis (disodium naphthalenesulfonate), sodium lignosulfonate, sodium methylsiliconate (polydimethylsiloxane). Police Def is used according to TU 2458-081-97457491-2012, an additive to reduce the water and gas permeability of cement stone Police Police Gas block according to TU 2458-065-97457491-2012, which is a composition based on synthetic sulfonated polymers, polypropylene fiber with a fiber length of 6- 8 mm, diameter 18 μm, which is a treated fiber capable of dispersion in an aqueous medium, tensile strength is 557 MPa, melting point 160 ° C. Producer "S.A Belgian Fibers N.V." (Belgium).

Currently, for the preparation of grouting mortars using the traditional technology, the chemicals included in the formulation are delivered to the drilling rig independently of each other, which during the preparation process leads to systematic violations of the technology for producing grouting mortar. In this case, the most common drawbacks are the lack of appropriate storage conditions for chemical reagents, their inaccurate dosage, leading to their cost overrun and reduced effectiveness of functional properties, violation of the sequence of reagent input, etc.

The main direction of improving the technology for the preparation of cement slurries is their preparation from a mixture of dry powdered ingredients.

The inventors propose a dry mixture for the preparation of an expanding grouting mortar, which is a combination of the solid components of the system or their agglomerates that are in contact, that is, this is a typical dispersed system in which the dispersed phase is distributed in the dispersed air.

The basis of the dry mix is Portland cement, which, as you know, has a tendency to caking and clumping.

Under the caking dry mixture understand the ability of strong adhesion of its particles to each other and the formation of a monolithic mass, depending on its stress state and external conditions. Portland cement is available in various grades and, depending on the grinding process, its particles will be larger or smaller. With a decrease in particle size, the number of points of contact between them increases, respectively, for finely ground cement, caking increases. Caking and clumping lead to a decrease in the flowability of the dry mix and do not allow it to dissolve in water when preparing the grouting mortar. Caking due to the compression of cement particles due to plastic deformation under the action of masses of overlying layers and hygroscopicity of cement.

To ensure the necessary flowability and obtain high stability during storage, the proposed dry mixture contains technical sodium borohydride in the indicated quantitative ratio, which prevents the caking and clumping of the mixture.

Technical sodium borohydride - inorganic salt with a density of 1070 kg / m ³ . When it is added to the dry mixture, a uniform distribution occurs between the cement particles, which prevents an increase in the contact area between them. The mechanism of action is as follows. Due to the peculiarities of the crystal structure of sodium borohydride, the surface of its particles has an electrostatic charge, as a result of which there is an interaction between sodium particles of borohydride and other reagents that make up the dry mixture. This leads to the formation of adsorption layers of sodium borohydride particles. The conglomerates resulting from this interaction also have an electrostatic charge, which leads to the repulsion of the particles of the mixture between themselves. This prevents the particles from converging, as a result of which the particles of the dry mixture do not stick together. As a result, the dry mixture does not cake and does not crumple, has high stability.

For the conditional indicator of caking of the dry mixture, determined according to GOST 12801-98, take the number of strokes necessary for the complete destruction of the sample by a cone.

The compositions of the dry mix for the preparation of expanding grouting mortar are shown in the table.

Thus, technical sodium borohydride plays the role of an anti-coagulant, which is confirmed by experimental data and indicates the high stability of the dry mixture.

Ultracement provides a high penetrating ability of the cement slurry prepared from the proposed dry mixture, behind the column, allowing it to penetrate into thin pores and cracks of the rock, while improving the strength characteristics of cement stone.

The content of Sulfacella in the composition of the dry mixture in the indicated quantitative ratio provides low filtration rates, sedimentation processes are excluded. As a result, the absence of water separation of the resulting cement slurry is ensured. Due to the synergistic effect in interaction with other ingredients, the grouting mortar obtained from the proposed dry mix with low filtration rates in the field will preserve the reservoir properties of the productive formations and prevent premature thickening of the grouting mortar and its rise to the design height.

The preparation of an expanding cement slurry from the proposed dry mixture with sufficiently low values of rheological parameters — improved structural and rheological properties is due to the following.

The content of the additive “PFM-NLK” allows to increase the mobility of the grout, modifying the structure of the grout, compacting it, which leads to a more complete replacement of the drilling fluid with grout during cementing, and also increases the strength of the cement stone. The water content and the filtrate yield of grouting mortar are reduced, which also leads to the formation of a cement stone with increased strength indicators, improved insulating properties. The mechanism of action of the PFM-NLK plasticizer is to block active centers at the edges of cement grains and edges of elementary neoplasms. This prevents adhesion or weakens their adhesion forces to each other, and thereby slows down the process of structure formation or significantly reduces the strength of the coagulation structure, and, therefore, reduces the structural and rheological parameters (plastic viscosity, static shear stress and dynamic shear stress) of the cement slurry and, accordingly, hydrodynamic pressure during plugging.

The content of Police Def provides a reduction in foaming and affects the density of cement slurry, increases the strength characteristics of cement stone formed during hardening.

Due to the introduction of a dry mixture of an ingredient - sodium technical borohydride, which also plays the role of an expanding additive, an expansion index is obtained that provides tight contact of cement with the rock and casing by increasing the intensity of the expanding additive. As a result of the expansion process, a cement stone of the required strength is obtained and its self-destruction is excluded. Hydrolysis of sodium borohydride (NaBH ₄ ) occurs according to the following reaction

NaBH ₄ + 4H ₂ O → NaB (OH) ₄ + 4H ₂ ↑.

Hydrogen gas is formed by the reaction of mixing water with sodium borohydride. The reaction is intensified in the presence of alkaline components of the proposed dry mix. The smallest gas bubbles, passing through the mass, cause it to expand. An increase in the amount of gas during the reaction, as well as an increase in temperature, causes the expansion of gas bubbles and the appearance of intrinsic stresses. The duration of the reaction is usually about 1 hour; gas evolution, as a rule, stops before the setting of cement. The introduction of an expanding additive, the role of which is sodium borohydride, allows you to get additional centers of crystallization of calcium hydrosilicates between the grains of cement, which significantly accelerates the development of early strength of cement stone, and, due to the increased additional reinforcement of the cement stone with crystallizing salts, when an expanding additive is introduced (borate crystals are additionally formed metals), the porosity changes and the density of the cement stone increases. As a result of hydration of the silicate phases of the Portland cement clinker, a polymer structure with a large number of siloxane (Si-O-Si) bonds is formed, and the expanding additive physically compensates for the shrink stresses that can occur in the cement stone during hardening. The sodium borate formed during the hydrolysis of sodium borohydride is a retarder of the setting of grouting mortar, which prevents its premature setting.

The synergistic effect of the interaction of the ingredients used in the specified quantitative ratio allows you to get a cement stone with high adhesive and strength characteristics already at an early stage of hardening for 1-2 days.

Polypropylene fiber, which is the thinnest synthetic fiber with a fiber length of 6-8 mm and a diameter of 18 microns, obtained from a high-modulus thermoplastic polymer by extrusion and subsequent drawing, plays the role of a reinforcing component. Reinforcement allows you to provide a quick set of structural strength, prevents shrinkage and increases the resistance of cement stone to cracking. Such a cement stone is characterized by higher bending and compression strength.

The specified polypropylene fiber provides resistance to cracking in cement stone by increasing:

- sedimentation stability of the solution (cement particles “hang” on the fibers);

- hydration rate at the initial stage of hardening (reduced internal loads), which helps to reduce the time between the beginning and end of setting of the solution.

To control the increase in the strength of the formed cement stone, the Gazblock additive is contained in the dry mixture, which slows down the growth of the ultimate static shear stress of the cement slurry, helping to transfer hydrostatic pressure to the bottom of the well at the end of the period of the slowed-up increase in the maximum static shear stress, causes a quick setting of the cement mortar, preventing gas penetration in the annular space. The synergistic effect of the action of Sulfacell and the Police Gasblock provides high gas blocking properties of the cement slurry and the inability to break through gas fluids (inter-layer flows) for a long time.

The content in the dry mixture of Ultracement in an amount of less than 9.09 wt. % does not provide the necessary strength indicators of cement stone, and more than 19.77 wt. % leads to a reduction in the setting time and pumpability, and, as a result, reduces the manufacturability of the work when cementing wells.

The dry mix of sodium technical borohydride in an amount of less than 1 wt. % is impractical since the dry flowability of the dry mixture is not ensured, which leads to caking and clumping, and insufficient gas generation will not provide the necessary expansion of the grouting mortar, and, consequently, obtaining tight contact of cement with the rock and casing.

The dry mixture content of sodium technical borohydride in an amount of more than 7 wt. % economically impractical.

The content in the dry mixture of Sulfacell in an amount of less than 0.3 wt. % and Police Gazblok in an amount of less than 0.1 wt. % is inexpedient, since the structural and rheological properties of the cement slurry are deteriorating, and the filtrate recovery and water separation of the grout are increasing. In addition, the migration of formation fluids into the annulus is not prevented.

The content in the dry mixture of Sulfacell in an amount of more than 0.5 wt. % and Police Gazblok in an amount of more than 0.5 wt. % leads to a sharp increase in viscosity properties, and therefore complications may arise when pumping cement slurry during use.

The content in the dry mixture of the additive "PFM-NLK" in an amount of less than 0.3 wt. % does not provide the necessary plasticizing properties of the cement slurry, increasing the filtrate recovery, and the content in an amount of more than 0.5 wt. % contributes to the additional foaming of the cement slurry, which leads to difficulty in pumping it.

The content in the dry mixture by Police Def is less than 0.1 wt. % will not provide anti-foaming, and the content in an amount of more than 0.5 wt. % economically impractical.

The content in the dry mixture of polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns is less than 0.03 wt. % worsens the strength properties of the formed cement stone, and the content in an amount of more than 0.06 wt. % leads to an increase in rheological values.

The dry mixture and the expanding grouting mortar from it are prepared in the factory using weighing batchers and a mixer. The proposed dry mixture, subject to proper storage, can have an unlimited shelf life and can be used at any necessary time to prepare an expanding cement slurry from it. The process of preparing an expanding cement slurry from a dry mixture is quite simple and allows to reduce the time and simplify the technology of preparing an expanding cement slurry from the used non-deficient ingredients. At the same time, transportation costs are also reduced, since the transportation of a liquid product is economically disadvantageous, and the range of reagents is also expanding.

Thus, according to the above, the proposed combination of essential features ensures the achievement of the claimed technical result. The inventive dry mix for the preparation of expanding cement slurry meets the condition of "inventive step".

In more detail, the essence of the claimed invention is described by the following examples.

Examples (laboratory). The process of preparing the dry mix is to mix the ingredients of the dry mix. Obtaining grouting mortar is carried out by mixing the dry mixture in the mixing fluid.

Example No. 1.

Prepare 1000 g of dry mix, g / wt. %:

Portland cement PCT III-O 6-100 784 / 78.40 Ultracement 197.7 / 19.77 Sodium borohydride technical 10/1 Sulfacell 3 / 0.3 Additive "PFM-NLK" 3 / 0.3 Police Def 1 / 0,1 Police Gazblok 1 / 0,1 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.3 / 0.03.

The dry mixture is thoroughly mixed.

To prepare an expanding grouting mortar with a water-cement ratio, the W / C ratio of 0.6 is the dry mixture is introduced into the mixing fluid. Stirred for 45 minutes. After that, the properties of grouting mortar and cement stone are determined: density p = 1600 kg / m ³ , spreadability - 19 cm, water separation - 2 ml, filtrate recovery after 30 min - 45 ml, the static shear stress through the SSS after 1 min / 10 min is 49 / 100, linear expansion after 5 hours - 2.0%, tensile strength in bending / compression - 2.2 / 3.6 MPa, thickening time at a temperature of 70 ° C - 100 min, the ejection force of the sample - 1.5 MPa, permeability of cement stone 0,0672 mD, setting time - start 8 hours 00 minutes, end 10 hours 00 minutes.

Example No. 2.

Prepare 1000 g of dry mix, wt. %:

Portland cement PCT III-O 6-100 801.3 / 80.13 Ultracement 144 / 314.43 Sodium borohydride technical 40/4 Sulfacell 4 / 0.4 Additive "PFM-NLK" 4 / 0.4 Police Def 3 / 0.3 Police Gazblok 3 / 0.3 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.4 / 0.04.

To prepare an expanding grouting mortar with W / C = 0.6, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 1600 kg / m ³ , spreadability - 21 cm, water separation - 0 ml, filtrate yield after 30 minutes - 36 ml, the static shear stress through the SSS after 1 min / 10 min 50/100, linear expansion after 5 hours - 7.0%, tensile strength in bending / compression - 2.3 / 4.5 MPa, thickening time at a temperature of 70 ° C - 80 min, sample ejection force - 1.6 MPa , permeability of cement stone - 0.00325 mD, setting time - beginning 7 hours 00 minutes, end 9 hours 00 minutes.

Example No. 3.

Prepare 1000 g of dry mix, wt. %:

Portland cement PCTIII-O66-100 818.5 / 81.85 Ultracement 90.9 / 9.09 Sodium borohydride technical 70/7 Sulfacell 5 / 0.5 PFM-NZh additive 5 / 0.5 Police Def 5 / 0.5 Police Gazblok 5 / 0.5 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.6 / 0.06.

To prepare an expanding grouting mortar with W / C = 0.6, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined by density p = 1600 kg / m ³ , spreadability - 23 cm, water separation - 0 ml, filtrate recovery after 30 minutes - 24 ml, the static shear stress through the SSS after 1 min / 10 min is 80 / 160, linear expansion after 5 hours - 9.0%, tensile strength in bending / compression - 2.4 / 4.0 MPa, thickening time at a temperature of 70 ° C - 70 min, the ejection force of the sample - 1.8 MPa, cement stone permeability - 0.00257 mD, setting time - beginning 7 hours 00 minutes, end 8 hours 00 minutes.

Example No. 6.

Prepare 1000 g of dry mix, g / wt. %:

Portland cement PCT-I-G 784 / 78.40 Ultracement 197.7 / 19.77 Sodium borohydride technical 10/1 Sulfacell 3 / 0.3 Additive "PFM-NLK" 3 / 0.3 Police Def 1 / 0,1 Police Gazblok 1 / 0,1 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.3 / 0.03.

To prepare an expanding grouting mortar with W / C = 0.44, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared grouting mortar and cement stone are determined: density p = 1930 kg / m ³ , spreadability - 21 cm, water separation - 2 ml, filtrate recovery after 30 min - 50 ml, the static shear stress through the SSS after 1 min / 10 min 35/91, linear expansion after 5 hours - 1.0%, tensile strength in bending / compression - 3.0 / 8.0 MPa, thickening time at 70 ° C - 92 min, sample ejection force - 2.8 MPa , permeability of cement stone - 0.00286 mD, setting time - start 6 hours 10 minutes, end 8 hours 15 minutes.

Example No. 7.

Prepare 1000 g of dry mix, wt. %:

Portland cement PCT-I-G 801.3 / 80.13 Ultracement 144.3 / 14.43 Sodium borohydride technical 40/4 Sulfacell 4 / 0.4 Additive "PFM-NLK" 4 / 0.4 Police Def 3 / 0.3 Police Gazblok 3 / 0.3 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.4 / 0.04.

To prepare an expanding grouting mortar with W / C = 0.44, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 1930 kg / m ³ , spreadability 24 cm, water separation 0 ml, filtrate yield after 30 minutes 30 ml, the static shear stress through the SSS after 1 min / 10 min 50/130, linear expansion after 5 hours - 6.0%, tensile strength in bending / compression - 4.2 / 13.2 MPa, thickening time at a temperature of 70 ° C - 80 min, sample ejection force - 3.0 MPa , permeability of cement stone - 0.00201 mD, setting time - start 3 hours 50 minutes, end 6 hours 20 minutes.

Example No. 8.

Prepare 1000 g of dry mix, wt. %:

Portland cement PCT-I-G 818.5 / 81.85 Ultracement 90.9 / 9.09 Sodium borohydride technical 70/7 Sulfacell 5 / 0.5 Additive "PFM-NLK 5 / 0.5 Police Def 5 / 0.5 Police Gazblok 5 / 0.5 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.6 / 0.06.

To prepare an expanding cement slurry 0.44, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 1940 kg / m ³ , spreadability - 21 cm, water separation - 0 ml, filtrate yield after 30 minutes - 24 ml, the static shear stress through the SSS after 1 min / 10 min 80/200, linear expansion after 5 hours - 9.0%, tensile strength in bending / compression - 5.7 / 15 MPa, thickening time at 70 ° C - 76 min, sample force - 3.2 MPa, permeability cement stone - 0.00081 mD, setting time - start 3 hours 00 minutes, end 5 hours 40 minutes.

Example 11

Prepare 1000 g of dry mix, g / wt. %:

Portland cement PCT-I-G 784 / 78.4 Ultracement 197.7 / 19.77 Sodium borohydride technical 10/1 Sulfacell 3 / 0.3 Additive "PFM-NLK" 3 / 0.3 Police Def 1 / 0,1 Police Gazblok 1 / 0,1 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.3 / 0.03.

To prepare an expanding grouting mortar with W / C = 0.45, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are added: density p = 2100 kg / m ³ , spreadability 25 cm, water separation 3 ml, filtrate recovery after 30 minutes 72 ml, the static shear stress through the SSS after 1 min / 10 min 53/130, linear expansion after 5 hours - 1.0%, tensile strength in bending / compression - 6.7 / 19 MPa, thickening time at a temperature of 70 ° C - 120 min, the ejection force of the sample - 3.7 MPa, permeability cement stone - 0,0157 mD, setting time - start 3 hours 50 minutes, end 7 hours 55 minutes.

Example No. 12.

Prepare 1000 g of dry mix, wt. %:

Portland cement PCT-I-G 801.3 / 80.13 Ultracement 144.3 / 14.43 Sodium borohydride technical 40/4 Sulfacell 4 / 0.4 Additive "PFM-NLK" 4 / 0.4 Police Def 3 / 0.3 Police Gazblok 3 / 0.3 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.4 / 0.04.

To prepare an expanding grouting mortar with W / C = 0.47, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone will be determined: density p = 2220 kg / m ³ , spreadability - 23 cm, water separation - 0 ml, filtrate yield after 30 min - 70 ml, the static shear stress through the SSS after 1 min / 10 min is 60 / 150, linear expansion after 5 hours - 7.0%, tensile strength in bending / compression - 8.2 / 22 MPa, thickening time at a temperature of 70 ° C - 90 min, force ejection of the sample - 4.0 MPa, permeability of cement stone - 0.0045 mD, setting time, start 9 hours 00 minutes, end 11 hours 00 minutes.

Example No. 13.

Prepare 1000 g of dry mix, wt. % .:

Portland cement PCT-I-G 818.5 / 81.85 Ultracement 90.9 / 9.09 Sodium borohydride technical 70/7 Sulfacell 5 / 0.5 Additive "PFM-NLK" 5 / 0.5 Police Def 5 / 0.5 Police Gazblok 5 / 0.5 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.6 / 0.06.

To prepare an expanding grouting mortar with W / C = 0.48, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 2200 kg / m ³ , spreadability - 22 cm, water separation - 0 ml, filtrate yield after 30 min - 61 ml, the static shear stress through the SSS after 1 min / 10 min 70/171, linear expansion after 5 hours - 9.0%, tensile strength in bending / compression - 8.5 / 23 MPa, thickening time at a temperature of 70 ° C - 80 min, the ejection force of the sample - 4.2 MPa, permeability cement stone - 0.0038 mD, setting time - beginning 8 hours 20 minutes, end 10 hours 05 minutes.

Example No. 16.

Prepare 1000 g of dry mix, g / wt. %:

Portland cement PCT III-O 6-100 784 / 78.40 Ultracement 197.7 / 19.77 Sodium borohydride technical 10/1 Sulfacell 3 / 0.3 Additive "PFM-NLK" 3 / 0.3 Police Def 1 / 0,1 Police Gazblok 1 / 0,1 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.3 / 0.03

To prepare an expanding grouting mortar with W / C = 0.6, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 1600 kg / m ³ , spreadability - 27 cm, water separation - 2 ml, filtrate recovery after 30 minutes - 40 ml, the static shear stress through the SSS after 1 min / 10 min 54/130, linear expansion after 5 hours - 1.0%, tensile strength in bending / compression - 1.7 / 2.0 MPa, thickening time at a temperature of 70 ° C - 160 min, sample ejection force - 1.3 MPa , permeability of cement stone 0.0621 mD, setting time - start 8 hours 10 minutes, end 10 hours 30 minutes.

Example No. 17. Prepare 1000 g of dry mix, wt. %:

Portland cement PCTIII-Ob 6-100 801.3 / 80.13 Ultracement 144.3 / 14.43 Sodium borohydride technical 40/4 Sulfacell 4 / 0.4 Additive "PFM-NLK" 4 / 0.4 Police Def 3 / 0.3 Police Gazblok 3 / 0.3 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.4 / 0.04.

To prepare an expanding grouting mortar with W / C = 0.6, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 1600 kg / m ³ , spreadability 25 cm, water separation - 0 ml, filtrate recovery after 30 minutes - 36 ml, the static shear stress through the SSS after 1 min / 10 min is 60 / 140, linear expansion after 5 hours - 6.5%, ultimate bending / compression strength - 1.8 / 2.3 MPa, thickening time at a temperature of 70 ° C - 180 min, sample ejection force - 1.4 MPa, permeability of cement stone - 0.00315 mD, setting time - start 7 hours 40 minutes, end 9 hours 30 minutes.

Example No. 18.

Prepare 1000 g of dry mix, wt. % .:

Portland cement PCTIII-Ob 6-100 818.5 / 81.85 Ultracement 90.9 / 9.09 Sodium borohydride technical 70/7 Sulfacell 5 / 0.5 Additive "PFM-NLK" 5 / 0.5 Police Def 5 / 0.5 Police Gazblok 5 / 0.5 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.6 / 0.06.

To prepare an expanding grouting mortar with W / C = 0.6, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 1600 kg / m ³ , spreadability - 23 cm, water separation - 0 ml, filtrate recovery after 30 minutes - 33 ml, the static shear stress through the SSS after 1 min / 10 min 65/170, linear expansion after 5 hours - 7.5%, ultimate bending / compression strength - 1.8 / 3.5 MPa, thickening time at a temperature of 70 ° C - 180 min, sample ejection force - 1.6 MPa , permeability of cement stone - 0.00291 mD, setting time - start 7 hours 00 minutes, end 8 hours 10 minutes.

Example No. 21. Prepare 1000 g of dry mix, g / wt. %:

Portland cement PCT III-O 6-100 784 / 78.40 Ultracement 197.7 / 19.77 Sodium borohydride technical 10/1 Sulfacell 3 / 0.3 Additive "PFM-NLK" 3 / 0.3 Police Def 1 / 0,1 Police Gazblok 1 / 0,1 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.3 / 0.03.

The dry mixture is thoroughly mixed.

To prepare an expanding grouting mortar with W / C = 0.44, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 1930 kg / m ³ , spreadability - 23 cm, water separation - 1 ml, filtrate recovery after 30 minutes - 50 ml, the static shear stress through the SSS after 1 min / 10 min 80/210, linear expansion after 5 hours - 1.0%, tensile strength in bending / compression - 2.5 / 4.7 MPa, thickening time at 70 ° C - 120 min, sample ejection force - 2.4 MPa , permeability of cement stone 0.00216 mD, setting time - start 3 hours 40 minutes, end 9 hours 05 minutes.

Example No. 22. Prepare 1000 g of dry mix, wt. %:

Portland cement PCT III-O 6-100 801,380,13 Ultracement 144.3 / 14.43 Sodium borohydride technical 40/4 Sulfacell 4 / 0.4 Additive "PFM-NLK" 4 / 0.4 Police Def 3 / 0.3 Police Gazblok 3 / 0.3 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.4 / 0.04.

To prepare an expanding grouting mortar with W / C = 0.44, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 1930 kg / m ³ , spreadability 22 cm, water separation 0 ml, filtrate yield after 30 min - 40 ml, the static shear stress through the SSS after 1 min / 10 min 80/250, linear expansion after 5 hours - 3.0%, tensile strength in bending / compression - 3.0 / 8.0 MPa, thickening time at a temperature of 70 ° C - 120 min, sample ejection force - 2.8 MPa , permeability of cement stone - 0.00097 mD, setting time - beginning 9 hours 00 minutes, end 15 hours 30 minutes.

Example No. 23. Prepare 1000 g of dry mix, wt. %:

Portland cement PCTIII-Ob 6-100 818.5 / 81.85 Ultracement 90.9 / 9.09 Sodium borohydride technical 70/7 Sulfacell 5 / 0.5 Additive "PFM-NLK" 5 / 0.5 Police Def 5 / 0.5 Police Gazblok 5 / 0.5 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.6 / 0.06.

To prepare an expanding grouting mortar with W / C = 0.44, the dry mixture is introduced into the mixing fluid. After that, the properties of the prepared cement slurry and cement stone are determined: density p = 1930 kg / m ³ , spreadability - 20 cm, water separation - 0 ml, filtrate recovery after 30 minutes - 36 ml, the static shear stress through the SSS after 1 min / 10 min 90/270, linear expansion after 5 hours - 4%, tensile strength in bending / compression - 3.4 / 8.0 MPa, thickening time at a temperature of 70 ° C - 110 min, the force to eject the sample - 3.2 MPa, permeability cement stone - 0.00064 mD, setting time - start 5 hours 40 minutes, end 10 hours 10 minutes.

In examples No. 1-5, 16-20 - use PTL Portland cement III - About 6-100, in examples No. 6-15, 21-25 - use PTL Portland cement - IG. To prepare the cement slurry, the dry mixture in examples No. 1-10 is closed with an aqueous solution of calcium chloride p = 1032 kg / m ³ , in examples No. 11-15 with an aqueous solution of potassium formate p = 1300 kg / m ³ , in examples No. 16-25 with water. The properties of grouting mortar and cement stone are determined when in accordance with GOST 1581-96 "Cement grouting" and GOST 26798.1-96 "Cement grouting. Test Methods. "

The results of the studies are presented in the table.

Thus, the claimed technical solution meets the conditions of "novelty, inventive step, industrial applicability", that is, is patentable.

Claims (2)

A dry mix for the preparation of an expanding grouting mortar containing Portland cement, Ultracement, technical sodium borohydride, Sulfacell, an additive for concrete and mortar of multifunctional action “PFM-NLK” (additive “PFM-NLK”), Politsom Def, an additive to reduce water and gas permeability cement stone Police Gazblok (Police Gazblok) and polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns in the following ratio of ingredients, wt. %: Portland cement 78.40-81.85 Ultracement 9.09-19.77 Sodium borohydride technical 1-7 Sulfacell 0.3-0.5 Additive "PFM-NLK" 0.3-0.5 Police Def 0.1-0.5 Police Gazblok 0.1-0.5 Polypropylene fiber with a fiber length of 6-8 mm, a diameter of 18 microns 0.03-0.06