Cement water-replenishing shrink-proof agent and preparation method and application thereof

A technology of anti-shrinkage agent and cement, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reduced bond strength, difficulty in implementation, reduction of cement stone compressive strength and interface bond strength, etc.

Active Publication Date: 2020-10-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lattice expansion agent and gas expansion agent are commonly used types of expansion agent for oil well cement, but the commonly used expansion agent is to make its own volume expand through chemical reaction in cement slurry to make up for the volume shrinkage of cement stone, which occurs in cement Chemical reactions will affect the performance of cement stone. For example, although the addition of lattice expansion agent can make up for the shrinkage of cement stone volume, it cannot increase the bonding strength between the cement sheath and casing, but it will reduce the bonding strength, and it cannot effectively resist temperature and temperature. The stress and strain caused by the pressure change will greatly reduce the bonding strength between the cement sheath and the casing after the temperature and pressure change; and the gas expansion agent should adopt a special process or gas expansion agent application technology to make the distribution range of the air hole diameter Concentration, otherwise it will reduce the compressive strength and interface bonding strength of cement stone, and it will be difficult to implement

Method used

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  • Cement water-replenishing shrink-proof agent and preparation method and application thereof
  • Cement water-replenishing shrink-proof agent and preparation method and application thereof
  • Cement water-replenishing shrink-proof agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 A kind of oil well cement replenishment anti-shrinkage agent

[0027] Dissolve 100 parts of 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 0.5 part of NN-methylenebisacrylamide in 200 parts of water, and then add 1 part of ammonium persulfate to form a reaction system. The reaction system was prepared into a spherical hydrogel using a bidisperse reversed-phase suspension polymerization method (ZL201310073224.0). Mix hydrogel and ultra-fine silica sand (1250 mesh) at a ratio of 20:3 and stir evenly, then dry to obtain moisturizing and anti-shrinkage agent S1. The particle size of the spherical hydrogel is 100-300 μm, and the particle size of the cement water replenishing anti-shrinkage agent is 50-100 μm.

[0028] Dry mix the cement water-replenishing anti-shrinkage agent with oil well cement and add admixtures and water, that is, G grade oil well cement + 2.5% sulfonic acid group and carboxylic acid group copolymerization fluid loss reducer + 1.5% sulfo...

Embodiment 2

[0029] Embodiment 2 A kind of oil well cement replenishment anti-shrinkage agent

[0030] Dissolve 100 parts of 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 1 part of NN-methylenebisacrylamide in 250 parts of water, and then add 2 parts of ammonium persulfate to form a reaction system. The reaction system was prepared into a spherical hydrogel using a bidisperse reversed-phase suspension polymerization method (ZL201310073224.0). Mix hydrogel and ultra-fine silica sand (6000 mesh) at a ratio of 10:1, stir evenly, and then dry to obtain moisturizing and anti-shrinkage agent S2. The particle size of the spherical hydrogel is 100-300 μm, and the particle size of the cement water replenishing anti-shrinkage agent is 50-100 μm.

[0031] Dry mix the cement water-replenishing anti-shrinkage agent with oil well cement and add admixtures and water, that is, G grade oil well cement + 2.5% sulfonic acid group and carboxylic acid group copolymerization fluid loss reducer + 1.5% sulfo...

Embodiment 3

[0032] Embodiment 3 A kind of oil well cement replenishment anti-shrinkage agent

[0033] Dissolve 100 parts of 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 1.5 parts of NN-methylenebisacrylamide in 300 parts of water, and then add 3 parts of ammonium persulfate to form a reaction system. The reaction system was prepared into a spherical hydrogel using a bidisperse reversed-phase suspension polymerization method (ZL201310073224.0). Mix the hydrogel and superfine calcium carbonate (1250 mesh) at a ratio of 20:3 and stir evenly, then dry to obtain the moisturizing anti-shrinkage agent S3. The particle size of the spherical hydrogel is 100-300 μm, and the particle size of the cement water replenishing anti-shrinkage agent is 50-100 μm.

[0034] Dry mix the cement water-replenishing anti-shrinkage agent with oil well cement and add admixtures and water, that is, G grade oil well cement + 2.5% sulfonic acid group and carboxylic acid group copolymerization fluid loss reducer +...

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Abstract

The invention relates to a cement water-replenishing shrink-proof agent and a preparation method and application thereof, in particular to an oil well cement water-replenishing shrink-proof agent anda preparation method and application thereof, and belongs to the field of oilfield chemistry and oil-gas well cementing materials. The cement water-replenishing shrink-proof agent is prepared from spherical hydrogel and ultrafine powder, and the spherical hydrogel is prepared from the following raw materials in parts by weight: 100 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.5 to 2 partsof N, N '-methylene bisacrylamide and 1 to 4 parts of ammonium persulfate. The cement water-replenishing shrink-proof agent is in a microsphere form. Starting from the apparent volume shrinkage mechanism of set cement, when moisture in pores of the set cement forms a concave liquid surface, the set cement is supplemented with moisture, shrinkage of the set cement is prevented through the physicalwater control effect, no chemical reaction occurs in the process, and the influence on the performance of cement paste is small.

Description

technical field [0001] The invention relates to a cement water replenishing anti-shrinkage agent and its preparation method and application, in particular to an oil well cement water replenishment anti-shrinkage agent and its preparation method and application, belonging to the fields of oil field chemistry and oil and gas well cementing materials. Background technique [0002] The hydration process of cement is the process of volume reduction. With the progress of cement hydration, the volume of hydration products is smaller than the total volume of cement particles and water before hydration, resulting in the increase of pore volume in cement stone, so that the moisture in the pores forms The concave liquid surface produces interface shrinkage force, and the interface shrinkage force of the concave liquid surface in the pores can further lead to the apparent volume shrinkage of cement stone. If the cement stone shrinks in volume, it will seriously affect the cementing qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F220/58C08F222/38C08F2/18C09K8/467
CPCC04B40/0046C08F220/585C08F2/18C09K8/467C08F222/385C04B24/163C04B14/06C04B14/28
Inventor 柳华杰霍美桦吴奇徽步玉环
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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