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

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

A technology of dispersion liquid and cement slurry, which is applied in the field of petroleum cementing, can solve the problems of destroying the internal microstructure of cement stone, reducing the strength, destroying the bonded structure of the cement ring interface, etc., to solve the interface sealing failure, inhibit curing shrinkage, and thicken Good adjustable effect

Active Publication Date: 2022-05-20
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 5Kg of sodium polycarboxylate, 1.5Kg of polyacrylamide and stir evenly, add 340Kg spherical nano ferric oxide (wherein, 10nm of diferric oxide 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-stage 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 anti-channeling cement slurry for well cementing (in 10 cubi...

Embodiment 3

[0072] Add sodium carbonate in 220Kg of distilled water, make the pH value of solution 10.0, add the sodium polycarboxylate of 2.5Kg, the polyacrylamide of 1.25Kg and stir evenly, add 250Kg spherical trimanganese tetraoxide (wherein, the trimanganese tetraoxide of 30nm 80Kg, 50Kg, 50Kg, 50Kg of 50nm manganese tetraoxide, 50Kg of 80nm manganese tetraoxide, 70Kg of 100nm manganese tetraoxide), stirred and dispersed at a speed of 1400r / min in the stirring disperser for 30 minutes, 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. After one year of gravity settling at room temperature, the dispersion of multi-level particle size nanometer trimanganese tetroxide did not precipitate and still had fluidity.

[0073] The density is 1.92g / cm 3 The preparation method of ...

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
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a dispersion liquid for suppressing solidification shrinkage of an oil well cement sheath, cement slurry for suppressing solidification shrinkage and a preparation method thereof. The viscosity of the nanoparticle dispersion liquid with multi-level particle diameters of the present invention is less than 0.15 Pa·s, and the stable period can reach more than one year. The cement slurry that inhibits solidification and shrinkage of the present invention has good thickening adjustability, easy preparation of cement slurry, shrinkage rate of cement slurry after curing can be reduced by more than 80%, and permeability can be reduced by more than 85%, which can effectively solve the problem of oil well cement sheath interface Seal failure problem.

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. This shrinkage directly affects the sealing ability ...

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
Patent Type & Authority Patents(China)
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