Unlock instant, AI-driven research and patent intelligence for your innovation.

Dispersion liquid for cement paste, cement paste and preparation method thereof

A dispersion liquid and cement slurry technology, which is applied in the field of petroleum cementing, can solve the problems of destroying the internal microstructure of cement stone, destroying the bonded structure of the cement ring interface, and reducing the strength, so as to solve the problem of interface sealing failure and good thickening adjustability , the effect of inhibiting curing shrinkage

Active Publication Date: 2021-02-26
CHINA PETROLEUM & CHEM CORP +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the more commonly used oil well cement expansion agents have certain limitations: ① Ettonite-based expansion agents
Studies have shown (Bu Yuhuan, Liu Huajie, Song Wenyu. Effect of lattice expansion agent on cement-casing interface bonding performance experiment [J]. Acta Petroleum Sinica, 2011,32(6):1067-1071), the addition of lattice expansion agent Although it can make up for the shrinkage of the cement stone volume, it cannot effectively improve the cement quality. The crystals aggregate and align at the interface of the cement sheath, which destroys the cement sheath interface cementation structure.
At the same time, these lattice expansion agents have a large scale, and the hydration reaction is inconsistent with the hydration reaction of cement, which will destroy the internal microstructure of cement stone, resulting in a decrease in its strength.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Sodium carbonate was added to 220Kg of distilled water to make the pH value of the solution 8.0, and 2.5Kg of sodium polycarboxylate and 1.25Kg of polyacrylamide were added to stir evenly, and 250Kg of spherical nanometer ferric oxide (wherein 10nm of diferric oxide was added) Iron 20Kg, 30nm ferric oxide 50Kg, 50nm ferric oxide 50Kg, 80nm ferric oxide 50Kg, 100nm ferric oxide 50Kg, 200nm ferric oxide 30Kg), in the stirring disperser at 1400r / min Rotating speed stirring and dispersing for 30 minutes, adding 25Kg ethylene glycol, adding 0.3Kg cyproconazole, stirring evenly, promptly made 50% (wt%) multi-level particle size nano-Fe 2 o 3 Dispersions. The density of the slurry is 1.67 / cm 3 , the average particle size is 86.2nm, and the viscosity is 0.083Pa·s. After gravity settling at room temperature within one year, multi-level particle size nano-Fe 2 o 3 The dispersion did not settle and remained fluid.

[0065] The density is 1.92g / cm 3 The preparation method of...

Embodiment 2

[0068] Add sodium hydroxide in 220Kg of distilled water, make the pH value of solution 10.0, add the sodium polycarboxylate of 5Kg, the polyacrylamide of 1.5Kg and stir evenly, add 340Kg spherical nano ferric oxide (wherein, the diferric oxide of 10nm Iron 20Kg, 30nm ferric oxide 80Kg, 50nm ferric oxide 90Kg, 80nm ferric oxide 80Kg, 100nm ferric oxide 50Kg, 200nm ferric oxide 20Kg), in the stirring disperser at 1400r / min Rotate to stir and disperse for 30 minutes, add 25Kg propylene glycol, add 0.6Kg formaldehyde, stir evenly, promptly make 60% (wt%) multi-level particle size nanometer Fe 2 o 3 Dispersions. The density of the slurry is 1.86 / cm 3 , The average particle size is 73.1nm, and the viscosity is 0.098Pa·s. After gravity settling at room temperature within one year, multi-level particle size nano-Fe 2 o 3 The dispersion did not settle and remained fluid.

[0069] The density is 1.93g / cm 3 The preparation method of the anti-channeling cement slurry for well cemen...

Embodiment 3

[0072] Add sodium carbonate in 220Kg of distilled water, make the pH value of solution 10.0, add 2.5Kg sodium polycarboxylate, 1.25Kg polyacrylamide and stir evenly, add 250Kg spherical trimanganese tetraoxide (wherein, 30nm trimanganese tetraoxide 80Kg, 50nm trimanganese tetraoxide 50Kg, 80nm trimanganese tetraoxide 50Kg, 100nm trimanganese tetraoxide 70Kg), stirred and dispersed for 30 minutes at a speed of 1400r / min in the stirring disperser, added 25Kg ethylene glycol, added 0.3Kg ring Propiconazole, stir evenly, promptly make 50% (wt%) multi-stage particle size nanometer Fe 2 o 3 Dispersions. The density of the slurry is 1.67 / cm 3 , the average particle size is 69.7nm, and the viscosity is 0.076Pa·s. Within one year of gravity settling at room temperature, the multi-level nanometer manganese tetraoxide dispersion did not precipitate and still had fluidity.

[0073] The density is 1.92g / cm 3 The preparation method of anti-channeling cement slurry (calculated in 10 cub...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
The average particle sizeaaaaaaaaaa
Viscosityaaaaaaaaaa
Densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a dispersion liquid for inhibiting curing shrinkage of an oil well cement sheath, cement paste for inhibiting curing shrinkage and a preparation method of the cement paste. Theviscosity of the multistage-particle-size nanoparticle dispersion liquid is smaller than 0.15 Pa.s, and the stable period can reach one year or longer. The cement paste for inhibiting curing shrinkage is good in thickening adjustability and easy to prepare, the shrinkage rate of the cured cement paste can be reduced by 80% or above, the permeability is reduced by 85% or above, and the problem ofinterface sealing failure of an oil well cement sheath can be effectively solved.

Description

technical field [0001] The invention relates to the field of petroleum cementing, in particular to a dispersion liquid for cement slurry, cement slurry and a preparation method thereof. Background technique [0002] After the oil well cement sheath is solidified, the hydration reaction will continue to occur for a long period of time, resulting in the volume shrinkage of the oil well cement sheath. The main curing shrinkage mechanism is as follows: ①The volume of the hydration reaction product decreases; ②The hydration reaction will consume the water in the gel pores, resulting in pore shrinkage under the action of capillary pressure. The cured volume shrinkage of the oil well cement slurry prepared with a water-cement ratio of 0.44 is generally 2-3%. This volume shrinkage phenomenon will cause a gap of 1 micron to appear on the two interfaces between the cement and the formation, and between the casing and the formation, and this shrinkage directly affects the sealing abil...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B24/32C04B14/30C04B20/00C04B28/02C09K8/467C09K8/487C04B111/34
CPCC04B40/0039C04B20/0084C04B28/02C09K8/467C09K8/487C04B2111/00724C04B2111/34C04B22/10C04B24/32C04B24/2652C04B14/308C04B24/02C04B22/062C04B2103/46C04B2103/22C04B2103/408C04B2103/50
Inventor 魏浩光杨红歧汪晓静李小江
Owner CHINA PETROLEUM & CHEM CORP