RU1818464C - Grouting mortar - Google Patents

Abstract

The inventive solution contains, wt.%: Cement 63-68, deman-poly-methylmethacrylate, modified with monoethanolamine 0.05-0.5; water the rest. Dzman is dissolved in water. Cement is poured into the resulting solution. Characteristic of cement stone: strength increases in the temperature range from -30 ° C to + 300 ° C. 1 tab.

Description

The invention relates to gas production, in particular to solutions used for fastening wells.

The purpose of the invention is to increase the strength properties of cement stones in the temperature range from -30 ° C to + 300 ° C.

A cement slurry containing cement, a water-soluble acrylic polymer and water, while it contains a deman - modified monoethanolamine polymethyl methacrylate as a water-soluble acrylic polymer in the following ratio, wt.%:

Cement 63-68 Daman-polymethyl-methacrylate modified with monoethanolamine 0.05-0.5 Water Else. The cement used in the work met the requirements of GOST 1581-85.

Daman is manufactured by GPO Plexiglas g, Dzerzhinsk in accordance with the requirements

TU 6-01-873-86, is a 30% solution of the basic substance in water. Daman polymer is a monoethanolamine-modified polymethylmethicrylate.

Daman, being added to the cement slurry in an amount of 0.05-0.5% at temperatures up to 200 ° C, has little effect on the setting time of the composition. As the temperature rises to 300 ° C, the setting of the composition in the presence of deman slows significantly. An increase in the strength properties of the resulting stone is observed over the entire temperature range. At subzero temperatures, the stone has a sufficiently high strength.

The technology for preparing the cement slurry is that the cement (cement) is thoroughly mixed with mixing water, into which the required amount of deman is preliminarily introduced.

EXAMPLE 1 1.5 ml (0.5 g; 0.05%) of deman are dissolved in 368.5 ml of water (36.95%) and 630 g (63%) of cement is added to this solution.

00

00

 about 1

The solution was placed in an autoclave at 180, 250, 300 and -30 ° C and its setting time and water yield were determined. Samples in the form of prisms 2x2x10 cm are prepared from the same solution.

setting time, hours-minute beginning end

bending / compression strength, MPa

after 1 day 8/12

after 30 days 9/12, 13.5 / 32.5; 5.3 / 7.5; 15.9 / 41.0;

after 90 days 10.0 / 13.9

after 180 days 10.9 / 14.0.

Example 2. 9 ml (3 g; 0.3%) of deman are dissolved in 331 ml of water (33.5%) and 660 g (66%) of cement is added to the same solution. Ras

5 180 ° C

-00

-fifteen

which harden for 1 day. Two of them are tested for bending and compression. The rest are laid in the aquatic environment and tested after 30, 90 and 180 days. Test Results:

250 ° C

1-20

2-00

300 ° C 0-56 1-40

-30 ° C

12-27

17-43

the creature is placed in an autoclave at 180, 250, 300 and -30 ° C and the time of its setting and water loss are determined. 8 samples are prepared from the same solution in the form of a 2x2x10 cm prism that harden for 1 day. Two of them are subjected to bending and compression immediately after a day. The rest are laid in water and tested after 30, 90, 180 days. Test Results:

setting time, hour-min beginning end

bending / compression strength, MPa after 1 day 3.8 / 8.3 after 20 days 3.2 / 10.0

10.7 / 25.9 12.8 / 35.1 2.0 / 6.2 90 days 3.9 / 11.0 180 days 4.1 / 11.9

Example 3. 15 ml (5 g; 0.5%) of deman are dissolved in 305 ml (31%) of water, and 680 g (68%) of cement is added to this solution. Solution

setting time, hour-min beginning end

bending / compression strength, MPa

after 1 day 2.5 / 7.5

after 30 days 3.0 / 9.39.5 / 22.1 11.0 / 31.8 1.5 / 5.8

after 90 days 3.4 / 10.5 after 180 days 3.9 / 11.6

Other examples are shown in the table. From the above data it can be seen that the developed solutions form a tampon stone, which retains bending and compression strength much longer than a stone from a cement slurry according to the prototype; the heat resistance of the developed solutions is 300 ° C; grouting compositions were selected so that the water-cement number was close to 0.5, which is common in drilling practice. The concentration of deman lies in the range of 0.05-0.5%: a) at a concentration below 0.05%, deman does not reduce the water loss of the cement slurry; b) at concentrations exceeding 0.5% 0, Daman reduces the strength of the resulting cement

300 ° C

1-20

2-09

-30 ° C

13-32

19-09

they are placed in an autoclave at 180, 250, 300 and -30 ° C and the setting time and water yield are determined. Eight samples were prepared from the same solution in the form of 2x2x10 cm prisms, which harden for 1 day. Two of them are tested for bending and compression immediately after one day. The rest are laid in the aquatic environment and tested after 30, 90 and 180 days. Test Results:

300 ° C -30 ° C

1-40 14-20

2-58 20-05

stone below 2.5 and 7.5 MPa, respectively, for bending and compression; at low temperatures (up to -30 ° C) the stone retains the strength of the property in accordance with technological requirements.

Thus, the developed composition has a low water loss, high durability and heat resistance.

Claims (1)

The claims A cement slurry containing cement, a water-soluble acrylic polymer and water, characterized in that, in order to increase the strength properties of the cement, in the temperature range from -30 ° to + 300 ° C, it contains deman-polymethyl methacrylate modified with monoethanolamine as a water-soluble acrylic polymer , in the following ratio of components, wt.%: Cement 63-68 Daman Polyme