RU2315077C1 - Grouting mortar solution - Google Patents

Abstract

FIELD: petroleum and gas extracting industry.

SUBSTANCE: grouting mortar solution contains Portland cement, water and alkylbenzylmethylamine chloride as a plasticizing agent and polyvinylpyrrolidone taken in the following ratio of components, wt.-%: Portland cement, 66; alkylbenzylmethylamine chloride, 0.1-0.3; polyvinylpyrrolidone, 0.2, and water, the balance. Invention provides enhancing capacity of grouting mortar solution in the hole efficient zone based on increasing time for providing the plastic strength, compression and bending strength, adhesion forces, and reducing cost. Invention is designated for carrying out repair-insulating works in petroleum and gaseous holes.

EFFECT: improved and valuable properties of solution.

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Description

The invention relates to the oil and gas industry and is intended for repair and insulation works in oil and gas wells.

Well-known grouting mortar (RF patent No. 1681599, A1, 1999.04.20). Grouting mortar containing slag sand cement, polymer additive and water, characterized in that, in order to reduce water loss and slow down setting time at a temperature of 140-170 ° C while reducing the consumption of polymer additives, it contains a graft copolymer of acrylic acid with polyvinyl as an additive alcohol in the following ratios of components, wt.%: slag sand cement - 68.2-70.4; grafted copolymer of acrylic acid with polyvinyl alcohol - 0.6-0.8; water is the rest. The disadvantage of this invention is the insufficient set time of plastic strength, insufficient compressive and bending strength, low adhesion in aggressive conditions, high cost.

Well-known grouting mortar (RF application No. 94007861, A1, 1995.12.10). A cement slurry containing Portland cement, expanding the addition of calcium oxide high-temperature firing and water, additionally contains a gas-releasing additive PAP-1, nonionic surfactant (AAS), anionic surfactant (AAS) and plasticizer in the following ratio, wt.h .: Portland cement 100; expanding additive 4-8; gas-generating additive 0.3-0.5; Nonionic surfactants 0.015-0.025; APAA 0.015-0.025; plasticizer 0.02-0.05; water 50. The disadvantage of this invention is the insufficient time to set plastic strength, insufficient compressive and bending strength, low adhesion in aggressive conditions, high cost.

A well-known grouting mortar adopted for the prototype (patent for the invention of the Russian Federation No. 2255204 C1, 2005.06.27). A lightweight cement slurry comprising Portland cement, a lightweight additive, aluminum oxychloride and water, as a lightening additive, contains an additive from the group: clay, tripoli, diatomite, vermiculite, perlite, and as aluminum oxychloride, at least a compound from the group: aluminum hydroxychloride, aluminum pentaoxychloride, aluminum tetraoxychloride in the following ratio of components, parts by weight: Portland cement 100, said lightening aid 5-10, said aluminum oxychloride 0.05-1, water — until a water-cement ratio is obtained 0.6-1.4. A cement slurry for a productive zone of a well, including Portland cement, aluminum oxychloride and water, contains as aluminum oxychloride at least one compound from the group: aluminum hydroxychloride, aluminum pentaoxychloride, aluminum tetraoxychloride, and additionally a fluid loss reducer and antifoam in the following ratio of components, wt. h: Portland cement 100, the specified aluminum oxychloride 0.05-4, the loss of water loss 0.2-0.6, antifoam 0.02-0.06, water to obtain a water-cement ratio of 0.45-0.5, and the specified Masonry mortar may additionally contain an accelerator and / or plasticizer in amounts of 0.04-0.6 wt.h. everyone. In the method of cementing wells, including washing with a buffer solution followed by injection of grouting cement, after washing with a buffer solution, a “thickened pack” of grouting mortar — metal silicate, said lightweight grouting mortar, and then said grouting mortar for the productive zone of the well are sequentially pumped (may additionally contain an accelerator and / or plasticizer in amounts of 0.04-0.6 parts by weight of each). The disadvantage of this invention is the low insulating ability of the lining in the productive zone, insufficient time to set plastic strength, low compressive and bending strength, low adhesion in aggressive conditions, high cost.

The technical result of the invention is to increase the insulating ability of the cement slurry in the productive zone of the well, by increasing the set time of plastic strength, compressive and bending strength and adhesive forces.

The technical result is achieved by the fact that the grouting solution containing Portland cement, a plasticizer, water, according to the invention contains as a plasticizer alkylbenzylmethylamine chloride and polyvinylpyrrolidone, in the following ratio of components wt.%:

Portland cement - 66;

alkylbenzylmethylamine chloride 0.1-0.3;

polyvinylpyrrolidone - 0.2;

water is the rest.

The application of the invention in comparison with the prototype allows to increase the time of the set of plastic strength and due to this increase the insulating characteristics of the lining of the well during the secondary opening of the reservoir, as well as increase the strength of cement stone for compression and bending, adhesive forces with metal, low cost.

When a low molecular weight cationic polymer is added to the grouting system, a redistribution of the surface charge of cement particles is observed, which ensures hydrophobization of the solid surface. This phenomenon increases the setting time and the set time of the plastic strength of the cement mortar, modifies the structure of cement stone, thereby improving its physical and mechanical characteristics.

The addition of a non-ionic high molecular weight polymer to the cement grout leads to stabilization of the system. The formation of foam is reduced, the setting time and the set time of plastic strength are further increased. The strength of the cement stone is increased, as well as the adhesion to metal.

Cement slurry is prepared as follows. Ingredients are added to water with constant stirring in the following ratio of components: cationic polymer - 0.1-0.3 wt.%, Nonionic polymer - 0.2 wt.%, Portland cement - 66 wt.%.

Next, the prepared cement slurry is supplied from the cementing unit through the monifold line and through the averaging tank into the well. The required amount of cationic polymer in the grout is taken based on the existing geological conditions of cementing. The resulting cement slurry is fed into the zone of the productive formation of the well through a cementing sleeve and squeezed out by the gap between the wall of the well and the casing.

The interaction of cationic and nonionic polymers ensures uniformity and stabilization of the cement system. Moreover, the cationic polymer is added in an amount of 0.1-0.3 wt.% From the condition of ensuring the necessary plasticity of the grouting mortar, and the amount of nonionic polymer in the range of 0.2 wt.% Is taken from the condition of ensuring the maximum strength characteristics of the grouting stone, as well as its ductility (see table).

Grouting mortars for repair and insulation works

No. of experience Reagents and their name Component Content Properties of cement slurry and stone W / C D cm Setting time: start-end, min σ _mfd, / MF and σ _squ , MPa one Portland cement one hundred 0.5 19 180-190 7.3 18.5 Cellulose 0.6 TBF 0.4 Hydroxychloride 4.0 2 Example 1 + 0.6 0.5 21 195-235 6.4 15.4 Plasticizer S-3 3 Example 1 + 0.04 0.5 21 210-265 7.6 14.9 Softener NTF four Portland cement 66 0.5 22 750-1345 8.8 18.6 Water 33.7 Alkylbenzylmethylamine Chloride (Catamine) 0.2 Polyvinylpyrrolidone (constipol) 0.1 5 Portland cement 66 0.5 > 25 765-1320 9.2 23.1 Water 33.6 Alkylbenzylmethylamine Chloride (Catamine) 0.3 Polyvinylpyrrolidone (constipol) 0.1 6 Portland cement 66 0.5 > 25 798-1580 10.6 25,2 Water 33.6 Alkylbenzylmethylamine Chloride (Catamine) 0.2 Polyvinylpyrrolidone (constipol) 0.2 7 Portland cement 66 0.5 > 25 790-1375 10,2 23.1 Water 33.5 Alkylbenzylmethylamine Chloride (Catamine) 0.3 Polyvinylpyrrolidone (constipol) 0.2 8 Portland cement 66 0.5 24 780-1320 8.6 17,2 Water 33.5 Alkylbenzylmethylamine Chloride (Catamine) 0.2 Polyvinylpyrrolidone (constipol) 0.3 9 Prototype 0.5 twenty 180-240 7.6 17

The use of the proposed grouting mortar provides the following advantages:

- increase the time of a set of plastic strength;

- increase the strength of cement stone in compression and bending;

- increase in adhesive forces with the casing string;

- reduction of its cost.

Claims (1)

A cement slurry containing Portland cement, a plasticizer, water, characterized in that it contains alkylbenzylmethylamine chloride and polyvinylpyrrolidone as a plasticizer in the following ratio, wt.%: Portland cement - 66 alkylbenzylmethylamine chloride - 0.1-0.3 polyvinylpyrrolidone - 0.2 water - the rest.