SU1802082A1 - Grouting compound - Google Patents

Description

The invention relates to the construction and repair of oil and gas wells, and in particular to grouting compositions for insulation works.

The aim of the invention is to increase the strength of the cement stone.

This goal is achieved by the fact that the grouting composition, including cement, alcohol and water, additionally contains a liquid-metal alloy C-GIO-alloy of gallium, indium and tin with a melting point of 10.5 ° C, and as alcohol - isobutyl alcohol with the following the ratio of ingredients, wt%:

Backfill Portland cement 63.4-65.0 isobutyl alcohol 0.13 -0.17 liquid metal alloy C-GIO-alloy of gallium, indium and tin with a melting point of 10.5 ° C 0.13-0.17 water the rest

The proposed composition is prepared as follows. First, isobutyl alcohol, C-HIO alloy and water are mixed. Then the backfill cement is mixed on the resulting aqueous solution and the mixture is thoroughly mixed.

The liquid metal alloy is a triple eutectic of gallium-indium tin. The S-GIO grade alloy produced by the industry has the following technical characteristics:

1802082 A1

temperature melting 10.5 ± 0.1 C boiling temperature above 2000 ° C vapor pressure at 20 ° C less 10 ¹² mm Hg st

density at 20 ° С viscosity at 25 ° С at 200 ° С

6.397 g / cm ³

0.34 mm ² / s

0.13 mm ² / s surface tension:

at 25 ° С 533.1 n / m at 200 ° С 505.1 n / m heat capacity at

200 ° C 346.3 J / kg x x deg.

electrical resistivity: at 25 ° С 3 10 ⁷ cm m at 200 ° С 4.6-10 ' ⁷ cmm temperature coefficient of volumetric expansion in the range of 20-200 ° С 1.31-10' ⁴ 1 / ° C

The alloy does not cause corrosion of stainless steels up to 250 ° С, and its alloys - up to 35 ° С, fluoroplastic - up to 250 ° С: aluminum dissolves at room temperature: not recommended for the study of water, oils in relation to most oils.

Under static conditions, the alloy is covered with a thin oxide film that protects it from further oxidation and can be stored indefinitely at temperatures above 10 ° C. For its storage, you can use plastic dishes (plant containers) or stainless steel vessels. Before filling the equipment with the alloy, the oxide film must be removed by dissolving in acids or alkalis or removed from the surface of the alloy with filter paper.

Due to its low vapor pressure, the alloy poses no danger to the human body; does not have an aggressive effect on the skin and mucous membranes, does not have a cumulative property.

Isobutyl alcohol is obtained from methylpropene (isobutylene) of petroleum gases, as well as from acetone and methyl magnesium salt.

snA ⁿ ' ^sn 2 ^he ^ sn? ^sn ^ ^un '

СНзСОСНз + СНзМд! - ^ (CHs) s SOMd I (CH ₃ ) s SOMd 1 + H ₂ O-> (CHs) s SOH + Md (OH) I.

Isobutyl alcohol is regulated by GOST 6016-72. Physicochemical properties of alcohol are given in table. 1,

As a mixing liquid, the water of the Caspian Sea was used, the chemical composition of which is given in table. 2.

The hardening mechanism of the cement slurry is as follows.

When the components of the C-HIO alloy and isobutyl alcohol are dissolved in seawater, this mixture has a rather strong magnetic moment and a high molecular weight, and a suspension is formed. The components of the C-GIO alloy and isobutyl alcohol 5 promote enhanced polymerization and crystallization of dispersed particles of Portland cement and a mixture of isobutyl alcohol and magnetic liquid metal liquid with the formation of 10 condensation-crystallization structure. The polyelectrolytes formed by mixing isobutyl alcohol with seawater and the C-HIO liquid metal alloy have a high molecular weight. In this case, polyelectrolytes should be used in very small quantities, since their excess stabilizes suspensions. As a result of the reaction, the so-called flocculation occurs, it can proceed due to the fact that long chains of isobutyl alcohol molecules are adsorbed at one end on one particle of the cement suspension, and at the other end on the other particle, forming a sufficiently strong bridge between the particles, the strength of which increases due to large magnetic moment, liquid metal alloy galium-indium-tin.

Thus, a cement stone of high strength and polymerization is formed.

Laboratory studies of the properties of the proposed cement slurry were carried out.

Example. The composition was prepared as follows. 0.4 g of isobutyl alcohol, 0.4 g of C-GIO alloy and 100 g of seawater are mixed in a beaker using a glass rod. Pour 200 g of Portland cement into a cup for preparing a cement mortar and add the resulting liquid. The mixture is thoroughly mixed with an MP-45 mixer at 600 rpm for 5 minutes. Then the finished solution is poured into special molds with a closing lid, vibrated with a TH-2 vibrator for 5 minutes, placed in a water bath, kept at a temperature of 130 ° C.

The physical and chemical properties of the cement slurry are determined in accordance with GOST 1581-78.

Comparative indicators of the physical and chemical properties of the known (prototype) and the proposed grouting compositions are given in table. 3.

From table. 3 it can be seen that the most optimal is the composition containing in wt%:

oil well cement isobutyl alcohol liquid metal alloy С-ГИО water

63.4-65.0

0.13-0.17

0.13-0.17 rest

The resulting cement stone has a high strength (21.823.4 MPa).

The optimal content of the constituent components is selected based on the results of laboratory studies. When the content of isobutyl alcohol and the liquid-metal alloy C-GIO is less than 0.13 or more than 0.17%, as can be seen from the table. 3, the strength of the cement stone structure is reduced.

The advantages of the proposed grouting composition are as follows:

- increasing the strength of cement stone 20 by 1.5-3 times;

- the presence of STIO alloy in the grouting solution will prevent corrosion of metal structures;

- due to the increased penetrating ability of the solution, the radius of treatment of the bottomhole zone increases. This will improve the quality of insulation work.

Claims (1)

Claim The grouting compound containing the grouting Portland cement, alcohol and water, characterized in that, in order to increase the strength of the resulting cement stone, it additionally contains a liquid metal alloy S-GIO alloy of gallium, indium and tin with a melting temperature of 10.5 ° C. and as alcohol - isobutyl alcohol with the following ratio of ingredients, wt%: oil well Portland cement 63.4-65.0; isobutyl alcohol 0.13-0.17 liquid metal alloy C-GIO-alloy of gallium, indium and tin with a melting point of 10.5 ° C 0.13-0.17: water rest. Table 1 Molecular mass Density, g / cm ³ Temperature, ° C Solubility melting boiling in water in organic solvents 74.12 0.805 108 108 9.5 ethyl alcohol, ethyl ether table 2 ι Specific ^gravity Chemical composition of water, mg / l Total mineralization, mg / g SG SO4 " NSOz ' Ca ^ Md ^ Na + iC I 1.008 5858 3140 244 369 822 3404 13837 Table 3 Comparative indicators of the physical and chemical properties of the known and proposed composition Components of the composition, wt% Spread, cm Density, g / cm ³ Experience conditions Setting time Stone strength, MPa Well cement Isobutyl alcohol Liquid metal alloy Sea water Т, ° C P, MPa Start the end Known composition (after 2 days) Well cement 18.5- 1.75- 100- 30-50 2.00- 2-30- 6.0- + PVA + TPFN -21 -1.76 -140 -4.45 -5-50 16.8 The proposed composition 66.6 0.07 0.07 33.26 22.0 1.86 130 50 3-30 5-15 20.4 65.0 0.14 0.16 34.70 21.0 1.83 130 50 4-10 5-20 21.8 63.4 0.13 0.13 36.34 23.0 1.88 130 50 4-15 5-10 22.9 65.0 0.17 0.17 34.66 21.5 1.88 130 50 4-05. 4-42 23.4 66.4 0.20 0.18 33.22 21.8 1.86 130 50 4-0.1 5-30 19.8 66.3 0.20 0.23 33.27 20.7 1.88 130 50 4-05 5-10 197 Editor Compiled by R. Allakhverdiev Techred M. Morgental Corrector 3. Sal ko Order 835 Circulation Subscription VNIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhgorod, Gagarin str., 101