PL236863B1 - Composition of the low-settling cement-latex grout with water-glass addition - Google Patents

Abstract

The subject of the application is a composition of a low-sedimentation cement-latex slurry with the addition of water glass based on drilling cement and water, which is characterized in that 100 parts by weight of drilling cement G are added to 50 parts by volume of water, from 0.3 to 0.5 part by weight of the product of ethoxylation and oxypropylation of a saturated fatty alcohol, from 0.1 to 0.25 part by weight of modified polynaphthalene sulfonates, from 0.2 to 0.4 part by weight of a mixture of organic polymers and modified copolymers, from 1.0 to 3.0 part by weight of calcium chloride, from 2.0 to 4.0 part by weight of an aqueous sodium silicate solution, from 0.2 to 0.4 part by weight of a mixture of chemical compounds and mineral agents in the form of aluminum oxide, from 10 to 20 parts by weight of by weight of an aqueous dispersion of a butadiene-styrene-amide copolymer with the addition of modifying agents, from 1 to 2 parts by weight of a solution of an aqueous mixture of ethoxylated unsaturated alcohols, from 10 to 25 parts by weight of ground Portland cement and 3.0 parts by weight, in relation to the amount of water, of potassium chloride.

Description

Description of the invention

The subject of the invention is a composition of a low-sedimentation cement-latex grout with the addition of water glass, which is a composition of a non-sedimentation cement grout intended for sealing boreholes, in particular for sealing directional and horizontal holes, as well as vertical holes.

Information in the trade literature is available in AADE-16-FTCE-57 "Silica Dispersion for HT Oil Well Cement" by Mohamed Al-Bagoury and Philippe Revil, Elkem; Atle Kastad, Baker Hughes, in which the authors describe the use of an aqueous silica dispersion to eliminate the regression of the strength of cement stone at high temperatures (over 110 ° C), and in the article "Water demand of amorphous nano silica and its impact on the workability of cement paste ”By G. Quercia, G. Husken, HJH Brouwers, in Cernent and Concrete Research, published a study in which the issue of the influence of the addition of amorphous nanosilica on the workability and the related rheology of the cement grout was discussed.

In the publication of the Institute of Geotechnics of the Wrocław University of Technology entitled "Injection strengthening and sealing of soils in the construction of the metro", by R. Borys and S. Żak, there is information on the use of water glass as well as urea resins, acetone-formaldehyde, phenol, resorcinol and polyacrylates resins . The above additives are mainly used for cement slurries used in injection technologies in civil engineering. The addition of glass in this type of grout increases the gelation of the grout and reduces its permeability, improves strength and increases the aging resistance of the resulting reinforcement (grout). The injection agent based on water glass discussed in this publication is called "Geogel".

The solution from the patent application US 4,814,013 is also known, which discloses information on the use of water glass in a cement mortar in order to increase resistance to aggressive environment and durability during long-term exposure. The addition of water glass is in the range from 8% to 18% by weight.

In turn, the patent description PL 69732 B1 describes a method of producing refractory cast concrete. The improvement of refractory properties was achieved mainly thanks to the use of barium-alumina cement and refractory aggregates. The mixture contains the addition of water glass, used individually or as a composition of several compounds, in an amount of up to 5% by weight with respect to the basic ingredients. The obtained refractory concrete has a significant compressive strength, high resistance to thermal changes and a low heat transfer coefficient.

Cement slurries known from industrial practice for sealing casing pipes in openings with a significant deviation from the vertical, constitute a mixture of make-up water in which various compositions of modifying agents are dissolved. These are usually such agents as: fluidizing, defoaming, anti-filtering, setting time regulating and swelling agents. The binding material in commonly used cement slurries is Portland cement of CEM I 32.5R class or drilling cement G. Modified polynaphthalene sulfonates are used as a fluidizing agent, a foam reducing agent, i.e. the defoamer is usually the product of saturated fatty alcohol ethoxylation and propoxylation, while the agent used to reduce filtration, i.e. the so-called The antifiltration is a mixture of organic polymers and modified water-soluble copolymers. In order to obtain the required setting time, calcium chloride is used as setting accelerator or calcium and sodium lignosulfonates are used as setting retarders. The swelling agent that causes the slurry to expand is a mixture of chemicals and minerals, the most common of which is calcium oxide.

Exemplary solutions do not mention the influence of the addition of sodium water glass on the sedimentation stability of the cement paste.

The aim of the invention is to create a cementitious sealing material composition consisting of mixing water and known modifying agents dissolved in it, in particular such as: a fluidizing agent, defoaming agent, anti-filtration agent, binding regulating agent, swelling agent, which composition will form a cement slurry that does not sediment. , suitable for sealing pipes in directional, horizontal and vertical holes. Such a composition will not sediment solids. In addition, the cement stone formed from such grout will have a uniform microstructure regardless of the measurement point in the drill hole.

This means that the structure of the cement coat will show the same values of mechanical parameters, comparable values of physicomechanical parameters, regardless of the depth of the cement stone sample.

This aim has been achieved with the solution according to the invention, in which the composition of low-sediment cement-latex grout with the addition of water glass based on drilling cement and water is characterized by the fact that up to 50 parts of 100 parts by weight of water were added wt. G drilling cement and relative to cement added; from 0.3 to 0.5 parts wt. saturated fatty alcohol ethoxylation and propoxylation product, from 0.1 to 0.25 parts wt. modified polynaphthalene sulfonates, from 0.2 to 0.4 parts wt. mixture of organic polymers and modified copolymers, from 1.0 to 3.0 parts wt. calcium chloride, from 2.0 to 4.0 parts wt. aqueous sodium silicate solution, from 0.2 to 0.4 parts wt. mixtures of chemical compounds and minerals, from 10 to 20 parts wt. an aqueous dispersion of a styrene-butadiene-amide copolymer with the addition of modifying agents, from 1 to 2 parts wt. an aqueous solution of a mixture of ethoxylated unsaturated alcohols, from 10 to 25 parts wt. ground Portland cement as well as 3.0 parts. wt. in relation to the amount of water, potassium chloride.

Preferably, the composition of the low-sediment cement-latex grout with the addition of water glass contains from 1.0 to 3.0 parts of wt. calcium chloride, from 0.05 to 0.25 parts wt. calcium and sodium lignosulfonates.

The advantage of such a solution is the creation of a low-sediment composition of cement-latex grout with the addition of water glass, containing, inter alia, make-up water and modifying agents that will form a cement slurry that will not sediment. Such a composition did not sediment and is suitable for sealing pipes in directional, horizontal and vertical holes, because it maintains gas-tightness of the formed cement coat. The resulting cement stone has uniform mechanical and physical-mechanical parameters throughout its volume, and has a high durability for many years under various conditions. and pressure, between the rock mass, which has physicochemical parameters that are substantially variable along the entire length of the borehole, and the substantially smooth surface of the steel casing having low adhesion to cement slurries and characterized by different physicochemical properties, both from the properties of the rock mass and the cement slurry.

The subject matter of the invention in an exemplary embodiment is described below.

PL 236 863 Β1

First composition

tap water 0, 500 m ³ defoamer (product of saturated fatty alcohol ethoxylation and propoxylation) 3 kg fluidizing agent (modified polynaphthalene sulfonates) 2 kg anti-filter agent (mixture of organic polymers and modified copolymers) 2 kg setting accelerator (calcium chloride) 20 kg swelling agent (mixture of chemicals and minerals) 3 kg drilling latex (water dispersion of styrene-butadiene copolymer with the addition of modifying agents) 100 kg latex stabilizer (water solution of a mixture of ethoxylated unsaturated alcohols) 10 kg potassium chloride (KC1) 15 kg aqueous sodium silicate solution (trade name R145) 30 kg microcement (Portland cement with a specific surface area of approx. 1200 m ² / kg) 200 kg drilling cement G 1000 kg

PL 236 863 Β1

Second composition

tap water 0, 500 m ³ defoamer (product of saturated fatty alcohol ethoxylation and propoxylation) 3 kg fluidizing agent (modified polynaphthalene sulfonates) 1 kg anti-filter agent (mixture of organic polymers and modified copolymers) 2 kg set retarder (calcium and sodium lignosulfonates) 2 kg swelling agent (mixture of chemicals and minerals) 3 kg drilling latex (water dispersion of styrene-butadiene copolymer with the addition of modifying agents) 100 kg latex stabilizer (water solution of a mixture of ethoxylated unsaturated alcohols) 10 kg potassium chloride (KC1) 15 kg aqueous sodium silicate solution (trade name R145) 30 kg microcement (Portland cement with a specific surface area of approx. 1200 m ² / kg) 2 0 0 kg drilling cement G 1000 kg

Preparation of low-sediment compositions of cement-latex slurries with the addition of water glass.

To the above-mentioned amount of make-up water (tap water) is added during mixing in the following sequence according to the above-mentioned amounts: defoamer with the trade name PSP061 (Polski Serwis Płynów Wiertniczych - according to the chemical substance safety data sheet of 07.05.2003 ), a fluidizing agent under the trade name PSP 042 (Polski Serwis Płynów Wiertniczych), an anti-filtering agent under the trade name PSP 031 (Polski Serwis Płynów Wiertniczych), a swelling agent under the trade name PSP Q1 (Polski Serwis Płynów Wiertniczych), potassium chloride KC1 , aqueous sodium silicate solution with the trade name R145 (Producer: Z.Ch. Rudniki SA), calcium chloride CaCb (Polski Serwis Płynów Wiertniczych) - composition

PL 236 863 Β1 first, setting retardant under the trade name PSP 013 (Polski Serwis Płynów Wiertniczych) - composition two, drilling latex under the trade name PSP 104 (Polski Serwis Płynów Wiertniczych), latex stabilizer under the trade name PSP 103 (Polish companies Drilling Fluid Service). The mixture is stirred for about 10 minutes until the ingredients are completely dissolved and the mixture is homogeneous. Then, while stirring continuously, the microcement and Dyckerhoff drilling cement G are introduced. The cement slurries prepared in this way are mixed for a further 20 minutes and then introduced into the borehole, filling the space between the casing pipes and the rock.

Starters with the above composition have the following parameters:

The parameter is determined for cement slurries Unit The first composition Composition and the second Test temperature [° C] thirty 50 Test pressure [MPa] 5 18 Density [kg / m ³ ] 1810 1810 Water retention [%] 0.0 0, 0 Sedimentation stability The difference in density [kg / m ^3] Between the upper and middle portion of the column measured between the central and lower part of the column of measurement 0.0 0.0 0.0 0.0 Thickening time (consistency) * 30 Bc [h: minutes] 100 Bc [h: minutes] 2:20 3:00 am 1:50 2: 06 Filtration [cm ^3/3 0 minutes] 25 14 Compressive strength after 7 days [MPa] 14.1 16, 8 Gas permeability after 7 days [mD] 0.090 0.120

*) Consistency values are given in Bearden units (Bc) - acc. To EN-PN-10426 standards

The object of the invention can be used to seal casing in directional and horizontal and vertical holes

Claims (2)

Patent claims 1. A composition of low-sedimentation cement-latex grout with the addition of water glass based on drilling cement and water, characterized in that up to 50 parts 100 parts by weight of water were added wt. G drilling cement and relative to cement added; from 0.3 to 0.5 parts wt. saturated fatty alcohol ethoxylation and propoxylation product, 0.1 to 0.25 part wt. modified polynaphthalene sulfonates, from 0.2 to 0.4 parts wt. mixture of organic polymers and modified copolymers, from 1.0 to 3.0 parts wt. calcium chloride, from 2.0 to 4.0 parts wt. aqueous sodium silicate solution, from 0.2 to 0.4 parts wt. mixtures of chemical compounds and minerals, from 10 to 20 parts wt. an aqueous dispersion of a styrene-butadiene-amide copolymer with the addition of modifying agents, from 1 to 2 parts wt. an aqueous solution of a mixture of ethoxylated unsaturated alcohols, from 10 to 25 parts wt. ground Portland cement as well as in relation to the amount of water, 3.0 parts. wt. potassium chloride. 2. The composition of a low-sediment latex cement grout with the addition of water glass according to claim 1, characterized in that instead of from 1.0 to 3.0 part. wt. calcium chloride contains from 0.05 to 0.25 parts. wt. calcium and sodium lignosulfonates.